title: Breeding drought-tolerant maize hybrids for the US corn-belt: discovery to product.
abstract: 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.
authors.affiliation: DuPont Pioneer, 7250 NW 62nd Ave, Johnston, IA 50131, USA Mark.Cooper@pioneer.com.
authors.forename: Mark
authors.initials: M
authors.lastname: Cooper
authors.affiliation: Viluco Research Station, Semillas Pioneer Chile Ltda, Santa Filomena 1609-Buin, Chile.
authors.forename: Carla
authors.initials: C
authors.lastname: Gho
authors.affiliation: Woodland Research Station, DuPontPioneer, 18369 County Rd 96, Woodland, CA 95695, USA.
authors.forename: Roger
authors.initials: R
authors.lastname: Leafgren
authors.affiliation: DuPont Pioneer, 7250 NW 62nd Ave, Johnston, IA 50131, USA.
authors.forename: Tom
authors.initials: T
authors.lastname: Tang
authors.affiliation: DuPont Pioneer, 7250 NW 62nd Ave, Johnston, IA 50131, USA.
authors.forename: Carlos
authors.initials: C
authors.lastname: Messina
mesh_terms: D001947:Breeding / Q000266:history* / Q000379:methods; D055864:Droughts; D056726:Genetic Association Studies; D049673:History, 20th Century; D049674:History, 21st Century; D006824:Hybridization, Genetic; D014481:United States; D003313:Zea mays / Q000235:genetics*
keywords: AQUAmax®; drought; maize; managed environments; phenotyping; stress; tolerance; yield.