文献类型： 外文期刊

作者： Du, Yan-Lei ¹ ; Xi, Yue ¹ ; Cui, Ting ¹ ; Anten, Niels Pr ² ; Weiner, Jacob ³ ; Li, Xinmao ⁴ ; Turner, Neil C. ⁵ ; Zhao, ¹ ;

作者机构： 1.Lanzhou Univ, Sch Life Sci, Inst Arid Agroecol, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Gansu, Peoples R China

2.Wageningen Univ, Ctr Crop Syst Anal, POB 430, NL-6700 AK Wageningen, Netherlands

3.Univ Copenhagen, Dept Plant & Environm Sci, DK-1871 Frederiksberg, Denmark

4.Gansu Acad Agr Sci, Inst Dryland Agr, Lanzhou 730070, Gansu, Peoples R China

5.Univ Western Australia, UWA Inst Agr, M082,35 Stirling Highway, Crawley, WA 6009, Australia

6.Univ Western Australia, UWA Sch Agr & Environm, M082,35 Stirling Highway, Crawley, WA 6009, Australia

关键词： Smallholder farms; Risk reduction; Variety screening; Wheat breeding; Yield stability

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2020 年 257 卷

页码：

收录情况： SCI

摘要： Yield improvement for smallholder farmers in developing countries via crop breeding has been slow, in part because breeders have focused primarily on higher yields rather than stability of yield across environments. We investigated the relationships between (i) grain yield and yield-component traits, (ii) grain yield and yield stability, and (iii) reproductive (R) and vegetative (V) biomass in a field experiment with 18 spring wheat genotypes varying from landraces to recently-released breeding lines in a semiarid region under three different levels of precipitation. Genotypic differences in grain yield varied with the environment. The relationship between grain yield and yield components was also dependent on the environment, making it difficult to identify early-screening parameters for use in breeding programs. A genotype main effects and genotype by environment interaction effect analysis (GGE) showed a negative relationship between mean grain yield and yield stability across environments. There were significant differences among genotypes in the allometric exponent of the R-V relationship (slope of the log R - log V relationship). For the three highest yielding but less stable genotypes, this slope value was 1, while the five lowest yielding, but more stable genotypes, it was < 1. We hypothesize that the tradeoff between grain yield and yield stability reported here is biologically constrained and cannot be eliminated through breeding. Therefore, a balance between yield stability and high yield should be considered in future wheat breeding programs for smallholder farmers, rather than attempting to improve both.