DuPont Pioneer, 7250 NW 62nd Ave, Johnston, IA 50131, USA
Viluco Research Station, Semillas Pioneer Chile Ltda, Santa Filomena 1609-Buin, Chile.
J Exp Bot. 2014 Nov;65(21):6191-204. doi: 10.1093/jxb/eru064. Epub 2014 Mar 4.
Germplasm, genetics, phenotyping, and selection, combined with a clear definition of product targets, are the foundation of successful hybrid maize breeding. Breeding maize hybrids with superior yield for the drought-prone regions of the US corn-belt involves integration of multiple drought-specific technologies together with all of the other technology components that comprise a successful maize hybrid breeding programme. Managed-environment technologies are used to enable scaling of precision phenotyping in appropriate drought environmental conditions to breeding programme level. Genomics and other molecular technologies are used to study trait genetic architecture. Genetic prediction methodology was used to breed for improved yield performance for drought-prone environments. This was enabled by combining precision phenotyping for drought performance with genetic understanding of the traits contributing to successful hybrids in the target drought-prone environments and the availability of molecular markers distributed across the maize genome. Advances in crop growth modelling methodology are being used to evaluate the integrated effects of multiple traits for their combined effects and evaluate drought hybrid product concepts and guide their development and evaluation. Results to date, lessons learned, and future opportunities for further improving the drought tolerance of maize for the US corn-belt are discussed.
种质资源、遗传学、表型分析和选择，加上明确的产品目标定义，是成功的杂交玉米育种的基础。培育适合美国玉米带干旱地区的高产杂交玉米，需要整合多种特定于干旱的技术，以及构成成功玉米杂交育种计划的所有其他技术组件。管理环境技术用于在适当的干旱环境条件下实现精准表型分析的规模化，以达到育种计划的水平。基因组学和其他分子技术用于研究性状遗传结构。遗传预测方法用于培育在干旱环境下具有更好产量表现的品种。这是通过将干旱性能的精准表型与对目标干旱地区成功杂交品种有贡献的性状的遗传理解相结合，以及利用分布在整个玉米基因组上的分子标记来实现的。作物生长模型方法的进展用于评估多个性状的综合效应及其组合效应，评估干旱杂交品种的概念，并指导其开发和评估。讨论了迄今为止的结果、经验教训以及进一步提高美国玉米带玉米耐旱性的未来机会。
