Drought adaptation of stay-green cereals is associated with canopy development, leaf anatomy, root growth and water uptake

Borrell, Andrew K., Mullet, John E., George-Jaeggli, Barbara, van Oosterom, Erik J., Hammer, Graeme L., Klein, Patricia E. and Jordan, David R. (2014) Drought adaptation of stay-green cereals is associated with canopy development, leaf anatomy, root growth and water uptake. Journal of Experimental Botany, 65 21: 6261-6263. doi:10.1093/jxb/eru232


Author Borrell, Andrew K.
Mullet, John E.
George-Jaeggli, Barbara
van Oosterom, Erik J.
Hammer, Graeme L.
Klein, Patricia E.
Jordan, David R.
Title Drought adaptation of stay-green cereals is associated with canopy development, leaf anatomy, root growth and water uptake
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 1460-2431
0022-0957
Publication date 2014-11-01
Year available 2014
Sub-type Article (original research)
DOI 10.1093/jxb/eru232
Open Access Status DOI
Volume 65
Issue 21
Start page 6261
End page 6263
Total pages 3
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2015
Language eng
Formatted abstract
Stay-green sorghum plants exhibit greener leaves and stems during the grain-filling period under water-limited conditions compared with their senescent counterparts, resulting in increased grain yield, grain mass, and lodging resistance. Stay-green has been mapped to a number of key chromosomal regions, including Stg1, Stg2, Stg3, and Stg4, but the functions of these individual quantitative trait loci (QTLs) remain unclear. The objective of this study was to show how positive effects of Stg QTLs on grain yield under drought can be explained as emergent consequences of their effects on temporal and spatial water-use patterns that result from changes in leaf-area dynamics. A set of four Stg near-isogenic lines (NILs) and their recurrent parent were grown in a range of field and semicontrolled experiments in southeast Queensland, Australia. These studies showed that the four Stg QTLs regulate canopy size by: (1) reducing tillering via increased size of lower leaves, (2) constraining the size of the upper leaves; and (3) in some cases, decreasing the number of leaves per culm. In addition, they variously affect leaf anatomy and root growth. The multiple pathways by which Stg QTLs modulate canopy development can result in considerable developmental plasticity. The reduction in canopy size associated with Stg QTLs reduced pre-flowering water demand, thereby increasing water availability during grain filling and, ultimately, grain yield. The generic physiological mechanisms underlying the stay-green trait suggest that similar Stg QTLs could enhance post-anthesis drought adaptation in other major cereals such as maize, wheat, and rice.
Keyword Canopy development
Crop water use
Drought adaptation
Leaf anatomy
Root architecture
Sorghum
Stay-green
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 31 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 12 Feb 2015, 18:27:27 EST by Dr Erik Van Oosterom on behalf of Centre for Plant Science