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- W2083446546 abstract "Large and regional genotype × environment interactions can be a major impediment to sunflower ( Helianthus annuus L ) genetic progress in Argentina, where yield improvements have slowed since the mid‐1990s. Previous studies in the central subregion show that oil yield gains were maintained for the last 20 yr and contributed to counteracting a decline in agronomic quality of the sunflower area. In this study, mixed models, quantile regression, and pattern analyses were applied to three long‐term (18 yr) multienvironment datasets (67 sites) to show that: (i) in high‐yielding hybrids, oil yield has increased linearly by 6.7, 10.5, and 6.2 kg ha −1 yr −1 over 25 yr in the northern, central, and southern subregions, respectively; (ii) selection for specific adaptation to the central region did not improve oil yield in northern environments (consistent with previous pattern analysis–based predictions), nor in the southern region, suggesting that the south is a third mega‐environment; (iii) the central subregion had the greatest, most consistent genetic gain; (iv) while the relative regional responses of hybrid groups were similar for oil concentration and grain yield, there was strong hybrid × region crossover for relative responses of time to flowering; and (v) the merger of the original gene pools via breeding for oil yield reduced the original range on phenological responses within subregions and produced different maturity types for each region." @default.
- W2083446546 created "2016-06-24" @default.
- W2083446546 creator A5003308080 @default.
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- W2083446546 date "2010-03-01" @default.
- W2083446546 modified "2023-10-16" @default.
- W2083446546 title "Mega-Environment Differences Affecting Genetic Progress for Yield and Relative Value of Component Traits" @default.
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- W2083446546 doi "https://doi.org/10.2135/cropsci2009.04.0209" @default.
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