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Negative association between chickpea response to competition andcrop yield : phenotypic and genetic analysis

Colaborador(es): Lake, Lachlan | Li, Yongle | Casal, Jorge José | Sadras, Victor Oscar.
ISSN: 0378-4290.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): | CHICKPEA | COMMUNAL TRAITS | COMPETITION | FST | YIELD | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Field Crops Research vol.196 (2016), p.409-417, tbls., grafs.Resumen: Donald's ideotype and empirical evidence in cereal and oilseed crops indicate high yield is associatedwith less competitive plants. In this study we grew 20 chickpea lines in six environments to investigatethe association between yield and intra-specific competitive ability and its genetic underpinnings using Fst genome scan based on whole genome resequencing data. We measured yield and its components andcalculated response to competition [RC] as the ratio between the trait in outer rows [relaxed competition] and the trait in inner rows [higher competition]. Crop yield correlated negatively with RC for yield,biomass, harvest index, seed number, and pod number. Fst genome scan revealed 14 genomic regionsunder selection for response to competition of yield, seed number or biomass, and 6 genomic regionsunder selection for yield in inner or outer canopy rows. Candidate genes in these regions include mem-bers of the nitrate-transporter 1 family, patatin and hormone-related genes. The top genomic regionsfound to be under selection for yield in inner rows and outer rows did not coincide. This genetic archi-tecture provides a mechanistic basis for the observation that phenotypes that are adequate for relaxedcompetition often perform poorly in dense stands.
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Donald's ideotype and empirical evidence in cereal and oilseed crops indicate high yield is associatedwith less competitive plants. In this study we grew 20 chickpea lines in six environments to investigatethe association between yield and intra-specific competitive ability and its genetic underpinnings using Fst genome scan based on whole genome resequencing data. We measured yield and its components andcalculated response to competition [RC] as the ratio between the trait in outer rows [relaxed competition] and the trait in inner rows [higher competition]. Crop yield correlated negatively with RC for yield,biomass, harvest index, seed number, and pod number. Fst genome scan revealed 14 genomic regionsunder selection for response to competition of yield, seed number or biomass, and 6 genomic regionsunder selection for yield in inner or outer canopy rows. Candidate genes in these regions include mem-bers of the nitrate-transporter 1 family, patatin and hormone-related genes. The top genomic regionsfound to be under selection for yield in inner rows and outer rows did not coincide. This genetic archi-tecture provides a mechanistic basis for the observation that phenotypes that are adequate for relaxedcompetition often perform poorly in dense stands.

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