Selection for drought resistance in common bean also improves yield in phosphorus limited and favorable environments
Selection for drought resistance in common bean also improves yield in phosphorus limited and favorable environments
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DOI：
10.2135/cropsci2007.07.0404
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发表时间：
2008-03-01
期刊：
影响因子：
2.3
通讯作者：
Grajales, Miguel
中科院分区：
文献类型：
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作者：
Beebe, Stephen E.;Rao, Idupulapati M.;Grajales, Miguel
据估计，全球60%的普通豆（Phaseolus vulgaris L.）产量面临干旱风险。国际热带农业中心（CIAT）制定了一项育种计划，以培育具有小红、小黑、奶油（mulatinho）和奶油条纹（carioca）谷物品种潜力的抗旱育种品系。育种群体是由三重或双重杂交产生的。旱季在哥伦比亚Palmira的f21、f3∶51和f6∶8代进行了干旱末期的田间筛选，对小红和小黑品系进行了两个循环的反复筛选，对mulatinho和carioca品系进行了一个循环的反复筛选。抗旱品系在干旱条件下的产量均显著高于商业品种。在三个有利环境中的一个或多个环境中，或者在有利环境的组合分析中，一些在各自的检查中超出15%到25%（取决于颜色类别和试验），并且也更早成熟。抗旱品系在有利环境下的产量d（-1）可提高36%。有些还表示在磷限制的环境中产量更高。因此，抗旱性的选择提高了不同环境下的产量潜力和植物效率。提示干旱胁迫下的选择揭示了纠正野生菜豆遗传低效的基因，是提高普通豆产量的关键。
An estimated 60% of common bean (Phaseolus vulgaris L.) production worldwide is at risk of drought. A breeding program was developed at the International Center of Tropical Agriculture (CIAT) to create drought resistant breeding lines with varietal potential in the small red, small black, cream (mulatinho) and cream-striped (carioca) grain classes. Breeding populations were created from triple or double crosses. Field screening under terminal drought was performed at Palmira, Colombia in the dry season in F 21 F 3:51 and F 6:8 generations over two cycles of recurrent selection in the small red and small black classes, and one cycle in the mulatinho and carioca classes. Drought resistant lines yielded significantly more than commercial check cultivars under drought in all color classes. Some outyielded the respective checks by 15 to 25% (depending on color class and trial) in one or more of three favorable environments, or in the combined analysis across favorable environments, and were also earlier to mature. Drought resistant lines presented up to 36% greater yield d(-1) in favorable environments. Some also expressed superior yields in a phosphorus-limited environment. Thus, selection for drought resistance has improved yield potential and plant efficiency across different environments. It is suggested that selection under drought stress reveals genes that correct inefficiencies inherited from the wild Phaseolus vulgaris, and are key to yield improvement of common bean.