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Dealing with multiple traits in maize: A new approach for selecting progenies
Crop Science ( IF 2.0 ) Pub Date : 2020-08-06 , DOI: 10.1002/csc2.20292
Ailton José Crispim‐Filho 1 , Flávio Pereira dos Santos 1 , Jefferson Fernando Naves Pinto 2 , Patrícia Guimarães Santos Melo 1 , Edésio Fialho dos Reis 2 , Marcela Pedroso Mendes‐Resende 1
Affiliation  

Many maize (Zea mays L.) breeding programs select genotypes considering just grain yield. However, this strategy may not be efficient due to undesirable associations between grain yield and other traits. The breeder's challenge is to combine good characteristics in one genotype. The aim of this study was to propose a new approach to select maize progenies considering multiple traits. One hundred forty‐one half‐sib progenies were evaluated for 14 agronomic traits in a 12 by 12 triple lattice design in two environments. Four progeny selection strategies were performed to increase yield. Strategy 1, considering just yield; Strategy 2, considering all traits in a selection index; Strategy 3, considering only traits that have effect in yield, based on path analysis; and Strategy 4, similar to Strategy 3, but disregarding any trait showing undesirable correlation with other traits. Strategies 2, 3, and 4 considered Smith and Hazel index. The progenies selected by Strategy 4 showed more balanced predicted gains considering all traits. Its predicted gain in all traits related to yield was higher than the of Strategies 2 and 3, and it led to smaller gains in height and flowering time, which breeders want to decrease its means. Strategy 1 showed the best gains in yield, as expected, but obtained undesirable phenotypes for the other traits. The use of path analysis to delineate the Smith and Hazel index is a very appealing approach for selecting maize progenies and the Strategy 4 was the most efficient at accomplishing balanced gains for multiple traits.

中文翻译:

应对玉米的多个性状:选择子代的新方法

许多玉米(玉米)L.)育种计划仅考虑谷物产量来选择基因型。但是,由于谷物产量与其他性状之间存在不良关联,因此该策略可能无效。育种者面临的挑战是将一种基因型整合好特征。这项研究的目的是提出一种考虑多种性状选择玉米后代的新方法。在两种环境下,以12 x 12三重格子设计对141个半同胞后代进行了14个农艺性状评估。进行了四种后代选择策略以增加产量。策略1,仅考虑产量;策略2,考虑选择索引中的所有特征;策略3,基于路径分析,仅考虑对产量有影响的性状;和策略4,类似于策略3,但不考虑任何与其他性状表现出不良关联的性状。策略2、3和4考虑了Smith和Hazel指数。考虑到所有性状,策略4选择的后代显示出更加平衡的预测增益。它在与产量相关的所有性状上的预期增幅均高于策略2和3,因此导致身高和开花时间增幅较小,育种者希望减少其增产手段。正如预期的那样,策略1表现出最佳的增产效果,但获得了其他性状的不良表型。使用路径分析来描绘史密斯和榛树指数是选择玉米后代的一种非常吸引人的方法,策略4是实现多种性状平衡收获的最有效方法。考虑到所有性状,策略4选择的后代显示出更加平衡的预测增益。它在与产量相关的所有性状上的预期增幅均高于策略2和3,并导致株高和开花时间增幅较小,育种者希望减少其增产手段。正如预期的那样,策略1表现出最佳的增产效果,但获得了其他性状的不良表型。使用路径分析来描绘史密斯和榛树指数是选择玉米后代的一种非常吸引人的方法,策略4是实现多种性状平衡收获的最有效方法。考虑到所有性状,策略4选择的后代显示出更加平衡的预测增益。它在与产量相关的所有性状上的预期增幅均高于策略2和3,并导致株高和开花时间增幅较小,育种者希望减少其增产手段。正如预期的那样,策略1表现出最佳的增产效果,但获得了其他性状的不良表型。使用路径分析来描绘史密斯和榛树指数是选择玉米后代的一种非常吸引人的方法,策略4是实现多种性状平衡收获的最有效方法。哪个育种者想减少其手段。正如预期的那样,策略1表现出最佳的增产效果,但获得了其他性状的不良表型。使用路径分析来描述Smith和Hazel指数是选择玉米后代的一种非常吸引人的方法,策略4是实现多种性状平衡收获的最有效方法。哪个育种者想减少其手段。正如预期的那样,策略1表现出最佳的增产效果,但获得了其他性状的不良表型。使用路径分析来描绘史密斯和榛树指数是选择玉米后代的一种非常吸引人的方法,策略4是实现多种性状平衡收获的最有效方法。
更新日期:2020-08-06
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