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ORIGINAL RESEARCH article

Front. Nutr., 20 July 2018 | https://doi.org/10.3389/fnut.2018.00065

Integrating Environmental and Social Sustainability Into Performance Evaluation: A Balanced Scorecard-Based Grey-DANP Approach for the Food Industry

  • 1Department of Technology Management, University of Bridgeport, Bridgeport, CT, United States
  • 2College of Doctoral Studies, Grand Canyon University, Phoenix, AZ, United States
  • 3Departments of Mechanical Engineering and Technology Management, University of Bridgeport, Bridgeport, CT, United States
  • 4Department of Agricultural & Biosystems Engineering, Iowa State University, Ames, IA, United States

In addition to retaining high levels of customer satisfaction, sustainability of businesses is also heavily reliant on the efficiency of their internal and external processes. Continuous performance evaluations using key performance metrics to leverage operations are essential in maintaining a sustainable business while achieving growth objectives for revenue and profitability. Traditionally, companies have considered various financial criteria, quality characteristics, and targeted levels of service as their primary factors for performance evaluation. However, increasing environmental and social awareness and accompanying governmental legislations are now requiring companies to integrate these two aspects into their performance evaluations. With this motivation, this study proposes a Balanced Scorecard (BSC)-based approach combining Decision-Making Trial and Evaluation Laboratory (DEMATEL) and Analytic Network Process (ANP) methodologies for performance evaluation. The grey system theory has been utilized in order to capture the vagueness and the uncertainty in decision making. To demonstrate the functionality of the approach, a case study is conducted on a U.S.-based food franchise. The results of the algorithm and a discussion elaborating on the findings are provided.

Introduction

The food industry has always been one of the essential contributors to the United States economy. The USDA (U.S. Department of Agriculture) Economic Research Services stated that in 2016, with a 12.6% share, the food and related industries ranked third after housing (33%) and transportation (15.8%) in a typical American household's expenditures (1). According to the U.S. Bureau of Economic Analysis report published in the same year, the contribution of the food services and drinking places contributed to the Gross Domestic Product (GDP) 400.7 billion dollars (2). With a 227.3 billion dollar revenue in 2016, the fast food industry obtained the highest share in this market with an expect annual growth rate of 1.8% in the following 5 years (3).

Although the fast food restaurant sector is expected to grow at a flat rate, the industry has struggled due to the shift in consumer preferences with customers moving away from unhealthy and saturated food products over the last 5 years (3). As forecasts indicate that this healthier food trend will continue in the foreseeable future, major fast food retailers have been expanding their menus to include healthier options to prevent growing numbers of obesity, diabetes and other related health issues. Increasing focus on societal well-being has also shaped the business strategies in other aspects resulting in fast food retailers making community involvement, local supplier support, environmentally benign operations more visible in their business strategies.

For instance, the collaboration between Domino's and St. Jude Children's Research Hospital has raised more than 38 million dollars since 2004 (4). Ben and Jerry's has been using only fair trade ingredients. The company also developed a sustainability program for dairy farms in its home state, Vermont (5). Starbucks, in addition to being one of the top purchasers of renewable energy from the U.S. Environmental Protection Agency, pioneered collaborative farmer programs and activities, including Coffee and Farmer Equity (C.A.F.E.). Practices, farmer support centers, farmer loans and forest carbon projects is another example of such efforts (6).

Business operations has also seen a significant impact as a result of sustainability. The triple bottom line, a.k.a. environment, people, and revenue, are now considered to be integral parts of daily operational decisions since they are vital for business success. Therefore, measuring and evaluating environmental and social sustainability indicators are as crucial as the operational and financial ones in performance assessments.

The locavore strategy aims at encouraging consumers to purchase locally grown and sold food. The green image is an indicator of the overall perception regarding environmental friendly activities. Most performance evaluation methods fall short in addressing several sustainability aspects such as supporting locavore strategies and promoting green image. Furthermore, most studies utilize conventional Analytic Hierarchy Process (AHP) methodologies where only independent and hierarchical criteria are considered and do not include the interdependencies and interactions among the decision criteria. With this motivation, this study presents a Balanced Scorecard-based holistic performance evaluation framework that integrates environmental and social sustainability criteria into performance evaluation. Proposed approach measures the influences of each criterion on others leading to more reliable and accurate assessments. This novel approach extracts the weights of main and sub-criteria without requiring additional pairwise comparisons. Uncertainty and vagueness are also additional factors that are considered in the model.

The paper has the following structure. The literature review, providing information regarding the related work, is provided in section Literature Review. In this section, the focus is on the performance evaluation practices in food industry, the Balanced Score Card (BSC), Decision-Making Trial and Evaluation Laboratory (DEMATEL), and Analytic Network Process (ANP) methodologies, and Grey Systems Theory, respectively. Section Problem Description provides the problem description. A detailed explanation of the proposed methodology is presented in section Materials and Method. The practical application of the methodology is delineated in section A Food Industry Case Study with the help of a food industry case study. Conclusions and the implications of the work for future research are given in section Conclusions and Discussion.

Literature Review

A sustainable business contributes to sustainability by delivering economic, social, and environmental benefits simultaneously (7). To ensure their longevity, these deliverables need to be continuously measured and evaluated through periodical audits (8). Thus, similar to other service industries, integrating environmental, and social sustainability measures into performance evaluation has also become a necessity in the food industry. Motivated by this need, Gerbens-Leenes et al. (9) presented the findings regarding the use of environmental indicators for food production and proposed a method for measuring the environmental sustainability in food production systems. Salvá et al. (10) developed an audit tool for environmental measurement in the UK food sector. Maloni et al. (11) presented a detailed framework of unique Corporate Social Responsibility (CSR) applications in the food supply chain including animal welfare, biotechnology, environment, fair trade, health, and safety, and labor and human rights. Furthermore, in her study, Hartmann et al. (12) connected the rich body of literature on CSR to the food sector.

The balanced scorecard is a widely used strategic planning tool for performance measurement where financial and non-financial measures are integrated with corporate visions. In the literature, a variety of studies apply BSC to various fields including finance, human resources, supply chain management, sales, and marketing, and so on in order to pursue an effective and efficient visionary improvement of an organization. Even though the BSC model is proposed by Kaplan and Norton in 1992 (13) is more applicable for the operations of the profit-oriented organizations, the BSC model is also applicable for the socially and environmentally concerned processes, where particular characteristics of these processes that give emphasis on how well the organization fulfills its mission is considered (1416).

Several studies on BSC also involve sustainability approach in order to implement the performance evaluation center around multi-criteria decision-making approaches. Kongar (17) proposed a Green BSC approach combining with Linear Physical Programming (LPP) to measure the performance of supply chain management while defining the appropriate measurement criteria. Tsai et al. (18) utilized the sustainability balanced scorecard as a multi-criteria framework for socially responsible investment evaluation. Hsu et al. (19) utilized Fuzzy Delphi Method and ANP to construct a sustainability balanced scorecard framework to measure the sustainable performance for the semiconductor industry in Taiwan. Bhattacharya et al. (20) used a using fuzzy ANP-based balanced scorecard to determine a green supply chain performance measurement framework. Rabbani et al. (21) integrated sustainability balanced scorecard, ANP, and COPRAS (Complex Proportional Assessment) techniques to evaluate the performance of oil producing companies in Iran.

Decision-Making Trial and Evaluation Laboratory (22, 23) and Analytic Network Process (ANP) (24) are two well-studied methodologies in the Multi-Criteria Decision Making (MCDM) field (25). Various combinations of these two approaches have also been developed to determine the influences and interdependence among the evaluation criteria (26). The DEMATEL-based ANP (DANP) is the general form of cluster-weighted ANP. Traditional ANP requires the unweighted super-matrix to be built based on pairwise comparisons. The criteria weights are then obtained by limiting this super-matrix. In order to avoid the need for additional pairwise comparison data, DANP forms a comprehensive unweighted super-matrix by building the direct influence matrix where pairwise comparisons are included within clusters. After the unweighted super-matrix is built, the total relation matrices between clusters are utilized to construct the weighted super-matrix. Details of the approach in addition to its various applications can be found in Chen et al. (27), Chiu et al. (28), Hsu et al. (29), Hung et al. (30), Lee et al. (31), Liou (32), Wu, (33), Wu and Lee (34).

Uncertainty and incomplete information are two issues commonly encountered in multi-criteria decision making environment. Decision makers tend to use linguistic preference relations to express their preferences where there is lack of information (i.e., lack of numerical values for comparison). However, these linguistic preferences usually contain uncertainty and vagueness in the decision making process. Grey system theory (35) can be utilized to address these uncertainty issues. It provides an approach for analysis and modeling of systems with limited and incomplete information, and which may exhibit random uncertainty (36). Grey system theory research areas contain systems analysis, data processing, modeling, prediction, as well as decision making (37, 38). In their literature survey, Tozanli et al. (39) stated that the total number of studies incorporating grey system theory has increased significantly over the past 5 years including the publications in sustainability and MCDM fields. Golmohammadi et al. (40), developed a two-phased grey decision making approach to the supplier selection. Fu et al. (36) applied a grey DEMATEL approach to evaluate the green supplier development programs at a telecommunication systems provider. Furthermore, Dou et al. (37) used a grey-ANP method to identify green supplier development programs. Chithambaranathan et al. (41) applied a grey based hybrid MCDM framework for evaluating the environmental performance of service supply chains. Çelikbilek and Tüysüz (42) proposed an integrated grey MCDM approach for the evaluation of renewable energy sources.

A review of the existing literature reveals that no earlier study combining Grey System Theory, BSC, and DANP methodologies has been proposed to integrate environmental and social sustainability criteria into performance evaluation in the food industry. To the best of our knowledge, this study is the only research determines the weights of influenced criteria in franchised food retail stores via utilizing the methods mentioned above.

Problem Description

Increasing awareness of environmental and social sustainability has resulted in many companies making significant investments to integrate these measures into their performance evaluations. Determining the performance criteria and the criteria weights based on the particular industry in focus have been the subject of several studies in the literature. Compared to conventional manufacturing industries, establishing appropriate measures for service industries is a more challenging task. Particularly, as mentioned in section Introduction, fast food restaurant businesses are striving hard to implement various sustainable practices in that are suitable for the specific operations. Therefore, there is a need for an approach capable of considering the specific needs of businesses when defining the sustainability measures for that particular business.

Traditional AHP is highly capable of obtaining criteria weights via pairwise comparison in a hierarchical structure. However, the contemporary research in multi-criteria decision-making suggests that the evaluation criteria are influenced by one another and hence need to be represented as a network instead of hierarchically. With this motivation, this study propose a Balanced Scorecard-based DANP approach to determine the weights of the criteria. A case study in the food industry is also presented to illustrate the applicability of the proposed model.

Materials and Method

Kaplan and Norton (43) stated that the interrelation between the four perspectives of a typical Balanced Scorecard could be represented by a strategy map. Strategy map is a blueprint any organization can follow to align processes, people, and information technology for higher performance. Therefore, this study utilizes a Balanced Scorecard based Grey-DANP approach to determine the appropriate weights of the evaluation criteria. Figure 1 provides the steps of the methodology. The details of the methodology are provided in the following.

FIGURE 1
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Figure 1. Schematic representation of the proposed methodology.

Grey System Theory

Grey system theory was first introduced by Deng et al. (35) to deal with insufficient and incomplete information. In grey systems theory, a system is called a white system if the system information is fully known; and a black system if the information is not known at all. A system with partially known information is called a grey system. A grey number is a number with uncertain and/or incomplete information and can be mathematically expressed as X=[X_ ,X¯]={X| X_XX¯,   X_ and X¯  ϵ R}. Thus, ⊗X contains two real numbers X (the lower limit of ⊗X) and X¯ (the upper limit of ⊗X) is defined as below:

• If X- -and X̄  , then ⊗X is a black number with no meaningful information,

• Else if X-=X̄, then ⊗X is a white number with complete information,

• Otherwise X=[X- ,X̄], ⊗X is a grey number with insufficient and/or uncertain information.

Let there be two sets of grey numbers denoted by X1=[X1_ ,X1¯] and X2=[X2_ ,X2¯]. The basic mathematical operations for these two sets of grey numbers are listed below.

X1+X2=[X1_+X2_,X1¯+X2¯]    (1)
X1X2=[X1_X2¯,X1¯X2_]    (2)
X1*X2=[min(X1_X2_,X1¯X2¯,X1_X2¯,X1¯X2_),                      max(X1_X2_,X1¯X2¯,X1_X2¯,X1¯X2_)]    (3)
X1:X2=[X1_,X1¯]*[1X2¯,1X2_]    (4)
kX1=[kX1_,kX1¯],kϵR    (5)
X11=[1X1¯,1X1_]    (6)

In order to deal with the problems in a grey environment, an effective whitenization (grey aggregation) method is required. Opricovic et al. (44) developed Converting Fuzzy Data into Crisp Scores (CFCS) method to cope with the uncertainty and vagueness in multi-criteria decision problems. CFCS is designed to distinguish between two fuzzy numbers with the same crisp value obtained by the Centroid (center of gravity) method independent of the shape of the fuzzy numbers (34). The steps of the modified CFCS method utilized in this research are provided below.

Let  xijp=[xijp_ ,xijp¯] indicate the grey assessment of evaluator, p (decision maker), that will evaluate the influence of criterion i on criterion j. Then the following

Step 1: Normalization

xijp¯~=[xijp¯-minjxijp¯]/Δminmax    (7)
xijp_˜=[xijp_minjxijp_]/Δminmax    (8)

where

Δminmax=maxjxijp¯-minj    (9)

Step 2: Determination of a total normalized crisp value

Yijp=(xijp_˜(1xijp_˜)+(xijp¯˜*xijp¯˜))(1xijp_˜+xijp_˜)    (10)

Step 3: Calculate crisp values

zijp=minjxijp+YijpΔminmax    (11)

The DEMATEL Based ANP (DANP) Method

The DANP is a novel approach that combines the original DEMATEL and ANP methods to utilize total relation matrix for the criteria and the clusters, viz., the BSC dimensions in this study, and to build a network relation map (NRM) of the decision model. Based on the network relation map, the influential relationships are then obtained (26). The basic steps of the DANP approach are provided as follows:

• Generate the direct relation matrix

The initial step in this process is to obtain the decision maker assessments regarding the direct influence among the criteria. These assessments are represented as grey numbers and can be represented by one of the following five levels; “no influence,” “low influence,” “medium influence,” “high influence,” and “very high influence,” Here, the initial direct-relation matrix A is an n × n matrix where aij indicates the degree that the criterion i affects the criterion j and A = [aij]nxn.

• Normalize the direct relation matrix

The normalized direct-relation matrix X = [xij]nxn can be obtained through

X=A/s    (12)
where s=max[maxi = 1naij,maxj = 1naij].    (13)

Here, the normalized initial direct-relation matrix is obtained via Equation (12), and the s value representing the maximum values of the sums of all the rows and the sums of all the columns is calculated via Equation (13).

• Obtain the total relation matrix

The total relation matrix T = [tij]nxn can be obtained by utilizing Equation (14) where I is the identity matrix:

T=X+X2+X3++Xk=k = 1Xk=X(I-X)-1.    (14)

Furthermore, the method utilizes the sums of each row and column of the matrix T to build the NRM.

di=(ri)nx1=[j = 1ntij]nx1.    (15)
rj=(cj)nx1=[i = 1ntij]1xn.    (16)

Here, Equation (15) represents the row sum of the ith row of matrix T and shows the sum of direct and indirect effects of criterion i on the other criteria. Similarly, Equation (16) represents the sum of the jth column of matrix T and shows the sum of direct and indirect effects that criterion j has received from the other criteria. Furthermore, (d+r) indicates the importance of the criterion. Here, if (d–r) results in positive value it is implied that the criterion has an effect on others. Similarly, when (d–r) obtains a negative value then the criterion is affected by the others.

• Formation of an unweighted super-matrix

The weighted super-matrix is obtained by dividing each element in a column by the number of clusters with each cluster having equal weights. However, the equal weight assumption for each cluster is not always feasible due to the different degrees of influence among the criteria (45). In order to relax this unrealistic assumption, two different total influence matrices are then utilized. The first one, Tc=[tcij]nxn pertains to m criteria, while the second one, TD=[tDij]nxn is devoted to n dimensions, i.e., clusters, as shown in Equations (17) and (18).

yes
TD=[tD11tD1jtD1n  tDi1tDijtDin  tDn1tDnjtDnn]    (18)

• Normalize the total relation and total influence matrices

The normalized total relation matrix of criteria TCnor is computed by dividing the sum of each row in each sub-matrix. For instance, the normalized sub-matrix TCnor12 is calculated as in Equation (19).

yes

where ri12 represents the sum of each row in the sub matrix TC12. Then TCnor12 is obtained as shown in Equation (20).

TCnor12=[t1112/r112t1j12/r112t1m212/r112ti112/ri12tij12/ri12tim212/ri12tmi112/rm112tmij12/rm112tm1m212/rm112]    (20)

Similar to TCnor, the normalized total influential matrix for clusters TDnor is formed as shown in equation (21).

TDnor=[tD11/tD1tD1j/tD1tD1n/tD1tDi1/tDitDij/tDitDin/tDitDn1/tDitDnj//tDitDnn/tDi]=[tDnor11tDnor1jtDnor1ntDnori1tDnorijtDnorintDnorn1tDnornjtDnornn]    (21)

where the sum of each cluster is defined as tDi=j = 1ntDij.

• Build a weighted super-matrix

The unweighted super-matrix UC is the matrix transposed from the normalized total relation matrix for the criteria TCnor as shown in Equation (22).

yes

The weighted super-matrix W is obtained by incorporating the unweighted super-matrix UC and the normalized total influential matrix for clusters TDnor is shown in Equation (23):

W=[tDnor11xU11tDnori1xUi1tDnor1nxUn1tDnor1jxU1jtDnorijxUijtDnorinjxUnjtDnor1nxU1ntDnornjxUintDnornnxUnn]    (23)

• Limit the weighted super-matrix to obtain criteria weights

In order to obtain the final influential criteria weights, the weighted super-matrix W is raised to a sufficiently large power z until it converges and becomes a long-term stable super-matrix:

lims(W)z    (24)

A Food Industry Case Study

The case study is conducted in a U.S. based fast food restaurant company that owns several franchise retail stores in

the northeast region. The company management is in the process of introducing sustainability into their performance evaluation system and is investigating how these perspectives interact with each other. With this motivation, this study applies the proposed methodology using the data collected from the subject matter experts in the company.

Criteria Definition

Based on the balanced scorecard approach, the literature review, expert opinions, and interviews with the upper level management of the company, the performance evaluation criteria are determined. The criteria and their respective definitions are provided in Table 1.

TABLE 1
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Table 1. Criteria and their definitions.

Application of the Proposed Model

As mentioned in the proposed methodology section, Balanced Scorecard-Based Grey-DANP approach is applied to determine the global weights of the dimensions in BSC and the criteria. The decision makers used linguistic terms to assess the influences between the criteria. The assessment scale used in Grey-DANP is provided in Table 2.

TABLE 2
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Table 2. The grey linguistic scale for the assessments.

The direct relation matrix is formed according to franchisee and supervisors point of view and demonstrated in Table 3.

TABLE 3
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Table 3. The linguistic scale direct-relation matrix for the criteria.

The whitened assessments in the direct relation matrix are obtained via utilizing modified-CFCS method from Equations (7–11). Following this, the total relation matrix is obtained by utilizing Equations (12–14). The results are provided in the Appendix A in Tables A1,A2. Furthermore, the total influences given and received on the criteria along with the dimensions can be calculated using Equations (15, 16) as shown in Table 4.

TABLE 4
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Table 4. The sum of influences provided and received on the criteria and dimensions.

Thus, the influence diagram, a.k.a. the network relation map (NRM) from the DEMATEL method can be obtained as illustrated in Figure 2.

FIGURE 2
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Figure 2. The network relation map. (A) The network relation map of the BSC dimensions. (B) The network relation map of the criteria under D1. (C) The network relation map of the criteria under D2. (D) The network relation map of the criteria under D3. (E) The network relation map of the criteria under D4.

According to the results of the total relation matrix provided in Table A2, the influential weight of each criterion is obtained via the ANP algorithm. The normalized super-matrix TCnor is built by employing Equations (17–20). An unweighted super-matrix UC can be derived by transposing the normalized matrix as shown in Equation (22). The weights of the BSC dimensions (clusters) can be derived from the improved DANP method without employing further surveys as shown in Equation (21) instead of using additional pairwise comparisons amongst dimensions (45). Therefore, the weighted super-matrix W can be obtained through Equation (23). The final influential weights of each criterion can then be obtained by limiting the power of the weighted super-matrix until it converges into a steady state as shown in Equation (24). Resulting matrices are provided in Appendix A from Tables A3–A5, respectively. The global weights of the criteria (Table A5) can be obtained from the DANP method. Using these results, the local weight of each criterion and dimension can also be derived accordingly. The global and local weights along with the rankings of the criteria and BSC dimensions are provided in Table 5.

TABLE 5
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Table 5. The influential weights of the BSC dimensions and the criteria.

Conclusions and Discussion

Integrating environmental and social sustainability into business processes is becoming crucial to remain competitive in the current business environment. However, contemporary literature focusing on food service industry performance measurement is solely based on economic indicators and falls short in integrating these considerations into the evaluation process. Aiming at filling this gap, this study proposed an integrated approach combining social, environmental, and economic aspects together in the performance evaluation system of a fast food restaurant company. A Balanced Scorecard based Grey-DANP approach is applied to reveal the influences among the evaluation criteria and rank them with respect to their importance weights. A fast food restaurant company is selected as a case study to demonstrate the applicability of the approach.

Besides being the earliest study in combining Balanced Scorecard and Grey-DANP approaches in integrating sustainability aspects into performance evaluation framework, this research identifies the environmental and social performance measures a food store could utilize. Previously published studies consider the sustainability measures independent from one another and hence, mostly avoid the inter-influences which are not compatible with real world applications. Moreover, this study highlights that avoiding these criteria interactions may result in misleading criteria weights. The proposed approach revealed that although financial measures had higher importance values, environmental, and social measures also had significant influence. For instance, as it can be observed from Table 4 and Figure 2A, Financial Perspective (D1) has stronger relationships with the remaining BSC dimensions while Customer Perspective (D3) has the highest influence on others. As far as the evaluation criteria under the BSC perspectives are concerned, similar findings can be observed from Figure 2 and Table 4. The final ranking of the evaluation criteria with respect to their importance level is provided in Table 5. In terms of managerial implications, the findings of the proposed approach can provide some insight that can guide the company management to improve the store performance based on the criteria that have significant influence on the performance (18). In the future, the results of this study can be utilized in a performance evaluation technique (e.g., TOPSIS) with numerical data collected from the stores. This data can then be used to rank the stores with respect to their individual performances. The criteria set can be expanded to include additional environmental and social measures such as reduction in water and energy consumption in each store. Furthermore, for comparison purposes, a conventional AHP based study could be conducted to obtain the criteria weights in the same case study.

Author Contributions

GD and EK devised the project, the main conceptual ideas and proof outline. GD worked out almost all of the technical details, and performed the numerical calculations for the case study. MT provided the data and information regarding the case study. EK and KR verified the analytical methods. All authors provided critical feedback and helped shape the research and analysis. All authors discussed the results and contributed to the final manuscript.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Supplementary Material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fnut.2018.00065/full#supplementary-material

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Keywords: sustainability, food industry, performance evaluation, balanced scorecard, grey systems theory, DEMATEL, ANP

Citation: Duman GM, Taskaynatan M, Kongar E and Rosentrater KA (2018) Integrating Environmental and Social Sustainability Into Performance Evaluation: A Balanced Scorecard-Based Grey-DANP Approach for the Food Industry. Front. Nutr. 5:65. doi: 10.3389/fnut.2018.00065

Received: 09 April 2018; Accepted: 29 June 2018;
Published: 20 July 2018.

Edited by:

Rakesh Bhardwaj, National Bureau of Plant Genetic Resources (ICAR), India

Reviewed by:

Nathaniel K. Newlands, Agriculture and Agri-Food Canada (AAFC), Canada
Sanjeev Kumar, Indian Agricultural Statistics Research Institute (ICAR), India
Rajagopalan Srinivasan, Indian Institute of Technology Madras, India

Copyright © 2018 Duman, Taskaynatan, Kongar and Rosentrater. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Gazi M. Duman, gduman@my.bridgeport.edu