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Stay-green alleles individually enhance grain yield in sorghum under drought by modifying canopy development and water uptake patterns

Borrell, Andrew K. and van Oosterom, Erik J. and Mullet, John E. and George-Jaeggli, Barbara and Jordan, David R. and Klein, Patricia E. and Hammer, Graeme L. (2014) Stay-green alleles individually enhance grain yield in sorghum under drought by modifying canopy development and water uptake patterns. New Phytologist, 203 (3). p. 817. ISSN 0028646X

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Article Link(s): http://dx.doi.org/10.1111/nph.12869

Abstract

* Stay-green is an integrated drought adaptation trait characterized by a distinct green leaf phenotype during grain filling under terminal drought. We used sorghum (Sorghum bicolor), a repository of drought adaptation mechanisms, to elucidate the physiological and genetic mechanisms underpinning stay-green. * Near-isogenic sorghum lines (cv RTx7000) were characterized in a series of field and managed-environment trials (seven experiments and 14 environments) to determine the influence of four individual stay-green (Stg1–4) quantitative trait loci (QTLs) on canopy development, water use and grain yield under post-anthesis drought. * The Stg QTL decreased tillering and the size of upper leaves, which reduced canopy size at anthesis. This reduction in transpirational leaf area conserved soil water before anthesis for use during grain filling. Increased water uptake during grain filling of Stg near-isogenic lines (NILs) relative to RTx7000 resulted in higher post-anthesis biomass production, grain number and yield. Importantly, there was no consistent yield penalty associated with the Stg QTL in the irrigated control. * These results establish a link between the role of the Stg QTL in modifying canopy development and the subsequent impact on crop water use patterns and grain yield under terminal drought.

Item Type:Article
Business groups:Crop and Food Science
Subjects:Science > Biology > Genetics > Quantitative genetics (esp. Quantitative Trait Loci (QTL) articles)
Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Plant culture > Field crops > Sorghum
Deposited On:27 Aug 2014 02:44
Last Modified:27 Aug 2014 02:44

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