期刊
PLANT PHYSIOLOGY
卷 174, 期 3, 页码 1669-1682出版社
OXFORD UNIV PRESS INC
DOI: 10.1104/pp.17.00372
关键词
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资金
- Australian Research Council
- Grains Research and Development Corporation [ACP00002-Q]
- South Australian Government
- University of Adelaide
- Australian Department of Further Education, Employment, Science, and Technology
- European Union Framework Program 7, Drought-Tolerant Yielding Plants (DROPS) [FP7-KBBE-244374]
Yield is subject to strong genotype-by-environment (G x E) interactions in the field, especially under abiotic constraints such as soil water deficit (drought [D]) and high temperature (heat [H]). Since environmental conditions show strong fluctuations during the whole crop cycle, geneticists usually do not consider environmental measures as quantitative variables but rather as factors in multienvironment analyses. Based on 11 experiments in a field platform with contrasting temperature and soil water deficit, we determined the periods of sensitivity to drought and heat constraints in wheat (Triticum aestivum) and determined the average sensitivities for major yield components. G x E interactions were separated into their underlying components, constitutive genotypic effect (G), G x D, G x H, and G x H x D, and were analyzed for two genotypes, highlighting contrasting responses to heat and drought constraints. We then tested the constitutive and responsive behaviors of two strong quantitative trait loci (QTLs) associated previously with yield components. This analysis confirmed the constitutive effect of the chromosome 1B QTL and explained the G x E interaction of the chromosome 3B QTL by a benefit of one allele when temperature rises. In addition to the method itself, which can be applied to other data sets and populations, this study will support the cloning of a major yield QTL on chromosome 3B that is highly dependent on environmental conditions and for which the climatic interaction is now quantified.
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