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首页> 美国卫生研究院文献>Frontiers in Plant Science >Abiotic stress growth conditions induce different responses in kernel iron concentration across genotypically distinct maize inbred varieties
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Abiotic stress growth conditions induce different responses in kernel iron concentration across genotypically distinct maize inbred varieties

机译：非生物胁迫的生长条件在基因型不同的玉米近交品种中对籽粒铁浓度的不同响应

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摘要

The improvement of grain nutrient profiles for essential minerals and vitamins through breeding strategies is a target important for agricultural regions where nutrient poor crops like maize contribute a large proportion of the daily caloric intake. Kernel iron concentration in maize exhibits a broad range. However, the magnitude of genotype by environment (GxE) effects on this trait reduces the efficacy and predictability of selection programs, particularly when challenged with abiotic stress such as water and nitrogen limitations. Selection has also been limited by an inverse correlation between kernel iron concentration and the yield component of kernel size in target environments. Using 25 maize inbred lines for which extensive genome sequence data is publicly available, we evaluated the response of kernel iron density and kernel mass to water and nitrogen limitation in a managed field stress experiment using a factorial design. To further understand GxE interactions we used partition analysis to characterize response of kernel iron and weight to abiotic stressors among all genotypes, and observed two patterns: one characterized by higher kernel iron concentrations in control over stress conditions, and another with higher kernel iron concentration under drought and combined stress conditions. Breeding efforts for this nutritional trait could exploit these complementary responses through combinations of favorable allelic variation from these already well-characterized genetic stocks.
机译：通过育种策略来改善必需矿物质和维生素的谷物营养状况是农业地区的重要目标，在这些地区，诸如玉米等营养不良的农作物占每日热量摄入的很大一部分。玉米中的核心铁浓度表现出广泛的范围。但是，环境对基因型的影响程度（GxE）降低了选择程序的功效和可预测性，尤其是在面临非生物胁迫（例如水和氮的限制）的情况下。在目标环境中，籽粒铁浓度与籽粒大小的产量成分之间的反相关关系也限制了选择。我们使用25个玉米自交系，其中广泛提供了广泛的基因组序列数据，我们在使用因子设计的托管田间胁迫实验中评估了籽粒铁密度和籽粒质量对水和氮限制的响应。为了进一步了解GxE相互作用，我们使用分区分析来表征所有基因型中仁铁和体重对非生物胁迫的响应，并观察到两种模式：一种以在控制胁迫条件下控制较高的仁铁浓度为特征，另一种以在胁迫条件下控制仁铁浓度较高为特征。干旱和综合压力条件。这种营养性状的育种工作可通过从这些已经充分表征的遗传种群中进行有利的等位基因变异组合来利用这些互补反应。

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