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

Borrell, Andrew K., van Oosterom, Erik J., Mullet, John E., George-Jaeggli, Barbara, Jordan, David R., 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: 817-830. doi:10.1111/nph.12869


Author Borrell, Andrew K.
van Oosterom, Erik J.
Mullet, John E.
George-Jaeggli, Barbara
Jordan, David R.
Klein, Patricia E.
Hammer, Graeme L.
Title Stay-green alleles individually enhance grain yield in sorghum under drought by modifying canopy development and water uptake patterns
Journal name New Phytologist   Check publisher's open access policy
ISSN 1469-8137
Publication date 2014-08
Year available 2014
Sub-type Article (original research)
DOI 10.1111/nph.12869
Open Access Status
Volume 203
Issue 3
Start page 817
End page 830
Total pages 14
Place of publication Oxford United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2015
Language eng
Formatted 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.
Keyword Canopy development
Drought adaptation
Grain yield
Quantitative trait loci (QTLs)
Sorghum
Stay-green
Water uptake
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: QAAFI Biological Information Technology (QBIT) Publications
Official 2015 Collection
 
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