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首页> 外文期刊>Journal of Experimental Botany >Maize ARGOS1 (ZAR1) transgenic alleles increase hybrid maize yield
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Maize ARGOS1 (ZAR1) transgenic alleles increase hybrid maize yield

机译：玉米ARGOS1（ZAR1）转基因等位基因提高杂交玉米产量

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摘要

Crop improvement for yield and drought tolerance is challenging due to the complex genetic nature of these traits and environmental dependencies. This study reports that transgenic over-expression of Zea mays ARGOS1 (ZAR1) enhanced maize organ growth, grain yield, and drought-stress tolerance. The ZAR1 transgene exhibited environmental interactions, with yield increase under Temperate Dry and yield reduction under Temperate Humid or High Latitude environments. Native ZAR1 allele variation associated with drought-stress tolerance. Two founder alleles identified in the mid-maturity germplasm of North America now predominate in Pioneers modern breeding programme, and have distinct proteins, promoters and expression patterns. These two major alleles show heterotic group partitioning, with one predominant in Pioneers female and the other in the male heterotic groups, respectively. These two alleles also associate with favourable crop performance when heterozygous. Allele-specific transgene testing showed that, of the two alleles discussed here, each allele differed in their impact on yield and environmental interactions. Moreover, when transgenically stacked together the allelic pair showed yield and environmental performance advantages over either single allele, resembling heterosis effects. This work demonstrates differences in transgenic efficacy of native alleles and the differences reflect their association with hybrid breeding performance.
机译：由于这些性状的复杂遗传特性和环境依赖性，提高作物的产量和抗旱性具有挑战性。这项研究报告说，玉米基因ARGOS1（ZAR1）的转基因过表达增强了玉米器官的生长，谷物产量和干旱胁迫耐受性。 ZAR1转基因表现出环境相互作用，在温带干燥下产量增加，而在温湿度或高纬度环境下产量降低。本地ZAR1等位基因变异与干旱胁迫耐受性相关。在北美中熟种质中鉴定出的两个奠基者等位基因现在在先锋现代育种计划中占主导地位，并且具有独特的蛋白质，启动子和表达模式。这两个主要等位基因显示出杂种基团分配，其中一个主要存在于雌性先驱者中，另一个主要存在于雄性杂种基团中。当杂合时，这两个等位基因还与良好的农作物表现相关。等位基因特异性转基因测试表明，在本文讨论的两个等位基因中，每个等位基因对产量和环境相互作用的影响均不同。此外，当将这些等位基因对转基因堆叠在一起时，相对于任一等位基因而言，在产量和环境性能方面均具有优势，类似于杂种优势。这项工作证明了天然等位基因在转基因功效上的差异，并且差异反映了它们与杂交育种性能的关联。

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