Two decades of harnessing standing genetic variation for physiological traits to improve drought tolerance in maize

© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology.

Détails bibliographiques
Publié dans:Journal of experimental botany. - 1985. - 74(2023), 16 vom: 02. Sept., Seite 4847-4861
Auteur principal: Messina, Carlos D (Auteur)
Autres auteurs: Gho, Carla, Hammer, Graeme L, Tang, Tom, Cooper, Mark
Format: Article en ligne
Langue:English
Publié: 2023
Accès à la collection:Journal of experimental botany
Sujets:Review Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, Non-U.S. Gov't Crop growth models Shannon information theory drought tolerance genomic selection maize plant breeding standing genetic variation
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520 |a We review approaches to maize breeding for improved drought tolerance during flowering and grain filling in the central and western US corn belt and place our findings in the context of results from public breeding. Here we show that after two decades of dedicated breeding efforts, the rate of crop improvement under drought increased from 6.2 g m-2 year-1 to 7.5 g m-2 year-1, closing the genetic gain gap with respect to the 8.6 g m-2 year-1 observed under water-sufficient conditions. The improvement relative to the long-term genetic gain was possible by harnessing favourable alleles for physiological traits available in the reference population of genotypes. Experimentation in managed stress environments that maximized the genetic correlation with target environments was key for breeders to identify and select for these alleles. We also show that the embedding of physiological understanding within genomic selection methods via crop growth models can hasten genetic gain under drought. We estimate a prediction accuracy differential (Δr) above current prediction approaches of ~30% (Δr=0.11, r=0.38), which increases with increasing complexity of the trait environment system as estimated by Shannon information theory. We propose this framework to inform breeding strategies for drought stress across geographies and crops 
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650 4 |a Research Support, U.S. Gov't, Non-P.H.S. 
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650 4 |a Shannon information theory 
650 4 |a drought tolerance 
650 4 |a genomic selection 
650 4 |a maize 
650 4 |a plant breeding 
650 4 |a standing genetic variation 
700 1 |a Gho, Carla  |e verfasserin  |4 aut 
700 1 |a Hammer, Graeme L  |e verfasserin  |4 aut 
700 1 |a Tang, Tom  |e verfasserin  |4 aut 
700 1 |a Cooper, Mark  |e verfasserin  |4 aut 
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