Original Research ARTICLE
Waterlogging of winter crops at early and late stages: impacts on leaf physiology, growth and yield
- 1Facultad de Agronomía, Cátedra de Fisiología Vegetal, Universidad de Buenos Aires, Argentina
- 2Instituto de Investigaciones Fisiológicas y Ecologicas Vinculadas a la Agricultura (IFEVA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
- 3Faculty of Science, School of Agriculture and Environment, University of Western Australia, Australia
- 4CONICET Instituto de Investigaciones Fisiológicas y Ecologicas Vinculadas a la Agricultura (IFEVA), Argentina
Waterlogging is expected to increase as a consequence of global climate change, constraining crop production in various parts of the world. This study assessed tolerance to 14-days of early- or late-stage waterlogging of the major winter crops wheat, barley, rapeseed and field pea. Aerenchyma formation in adventitious roots, leaf physiological parameters (net photosynthesis, stomatal and mesophyll conductances, chlorophyll fluorescence), shoot and root growth during and after waterlogging, and seed production were evaluated. Wheat produced adventitious roots with 20-22% of aerenchyma, photosynthesis was maintained during waterlogging, and seed production was 86% and 71% of controls for early- and late-waterlogging events. In barley and rapeseed, plants were less affected by early- than by late-waterlogging. Barley adventitious roots contained 19% aerenchyma, whereas rapeseed did not form aerenchyma. In barley, photosynthesis was reduced during early-waterlogging mainly by stomatal limitations, and by non-stomatal constraints (lower mesophyll conductance and damage to photosynthetic apparatus as revealed by chlorophyll fluorescence) during late-waterlogging. In rapeseed, photosynthesis was mostly reduced by non-stomatal limitations during early- and late-waterlogging, which also impacted shoot and root growth. Early-waterlogged plants of both barley and rapeseed were upon drainage able to recover in growth, and seed production reached ca. 79-85% of the controls, while late-waterlogged plants only attained 26-32% seed production. Field pea showed no ability to develop root aerenchyma when waterlogged, and its photosynthesis (and stomatal and mesophyll conductances) was rapidly decreased by the stress. Consequently, waterlogging drastically reduced field pea seed production to 6% of controls both at early- and late-stages with plants being unable to resume growth upon drainage. In conclusion, wheat generates a set of adaptive responses to withstand 14 days of waterlogging, barley and rapeseed can still produce significant yield if transiently waterlogged during early plant stages but are more adversely impacted at the late stage, and field pea is not suitable for areas prone to waterlogging events of 14 days at either growth stage.
Keywords: seed production, Recovery, RGR = relative growth rate, Photosyhthesis, Rapeseed (Brassica napus L.), Field pea (Pisum sativum L), barley, wheat, waterlogging, aerenchyma
Received: 19 Sep 2018;
Accepted: 03 Dec 2018.
Edited by:Johannes Kromdijk, University of Cambridge, United Kingdom
Reviewed by:Angelika Mustroph, University of Bayreuth, Germany
Nobuhito Sekiya, Mie University, Japan
Sunita A. Ramesh, University of Adelaide, Australia
Copyright: © 2018 Ploschuk, Miralles, Colmer, Ploschuk and Striker. 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: Prof. Gustavo G. Striker, Universidad de Buenos Aires, Facultad de Agronomía, Cátedra de Fisiología Vegetal, Buenos Aires, C1053ABJ, Buenos Aires, Argentina, email@example.com