ORIGINAL RESEARCH article
Front. Plant Sci.
Sec. Plant Breeding
Volume 16 - 2025 | doi: 10.3389/fpls.2025.1572901
GENETIC VARIATION AND HERITABILTY OF HAPLOID FRAILTY IN MAIZE
Provisionally accepted- 1Iowa State University, Ames, United States
- 2Khon Kaen University, Khon Kaen, Thailand
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This research investigated the variation in haploid frailty (%HF), which is the difference in trait performance between isogenic haploid and diploid maize lines, and the heritability of haploid frailty for different agronomic traits. A total of 48 isogenic pairs was evaluated in three environments, and 192 isogenic line pairs were evaluated in two environments for plant height (PH), ear height (EH), flag leaf length (FLL) and width (FLW), tassel length (TL), spike length (SL), stem diameter (SD) and tassel branch (TB) number. We found that the qshgd1 locus, associated with spontaneous haploid genome doubling (SHGD), plays a crucial role in improving haploid performance by reducing %HF and promoting diploid-like vigor. The BS39+SHGD genotypes exhibited significantly lower HF% rates compared to the BS39 group, with consistent reductions across multiple traits. Environmental factors also contributed to %HF variation, but genetic influences such as the presence of SHGD proved to have a greater impact on haploid frailty. Leveraging SHGD to enhance both vigor and fertility of haploid plants, is likely to benefit breeding programs in maize and perhaps other crops by more economic and efficient production of DH lines.
Keywords: Doubled haploid, haploid frailty, haploid induction, heritability, Plant height, Spontaneous haploid genome doubling
Received: 07 Feb 2025; Accepted: 12 May 2025.
Copyright: © 2025 Yavuz, Wang, Fakude, Dermail, Frei, Liu and Lubberstedt. 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) or licensor 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: Thomas Lubberstedt, Iowa State University, Ames, United States
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