Stay-green traits to improve wheat adaptation in well-watered and water-limited environments

Christopher, John T., Christopher, Mandy J. , Borrell, Andrew K. , Fletcher, Susan  and Chenu, Karine  (2016) Stay-green traits to improve wheat adaptation in well-watered and water-limited environments. Journal of Experimental Botany, 67 17: 5159-5172. doi:10.1093/jxb/erw276


Author Christopher, John T.
Christopher, Mandy J. 
Borrell, Andrew K. 
Fletcher, Susan 
Chenu, Karine 
Title Stay-green traits to improve wheat adaptation in well-watered and water-limited environments
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
1460-2431
Publication date 2016-07-21
Sub-type Article (original research)
DOI 10.1093/jxb/erw276
Open Access Status Not Open Access
Volume 67
Issue 17
Start page 5159
End page 5172
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract A stay-green phenotype enables crops to retain green leaves longer after anthesis compared with senescent types, potentially improving yield. Measuring the normalized difference vegetative index (NDVI) during the whole senescence period allows quantification of component stay-green traits contributing to a stay-green phenotype. These objective and standardized traits can be compared across genotypes and environments. Traits examined include maximum NDVI near anthesis (Nmax), senescence rate (SR), a trait integrating senescence (SGint), plus time from anthesis to onset (OnS), mid-point (MidS), and near completion (EndS) of senescence. The correlation between stay-green traits and yield was studied in eight contrasting environments ranging from well watered to severely water limited. Environments were each classified into one of the four major drought environment types (ETs) previously identified for the Australian wheat cropping system. SGint, OnS, and MidS tended to have higher values in higher yielding environments for a given genotype, as well as for higher yielding genotypes within a given environment. Correlation between specific stay-green traits and yield varied with ET. In the studied population, SGint, OnS, and MidS strongly correlated with yield in three of the four ETs which included well-watered environments (0.43–0.86), but less so in environments with only moderate water-stress after anthesis (−0.03 to 0.31). In contrast, Nmax was most highly correlated with yield under moderate post-anthesis water stress (0.31–0.43). Selection for particular stay-green traits, combinations of traits, and/or molecular markers associated with the traits could enhance genetic progress toward stay-green wheats with higher, more stable yield in both well-watered and water-limited conditions.
Keyword Crop adaptation
Crop improvement
Drought
Genotype x environment interaction
Leaf senescence
Phenotyping
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Published online 21 July 2016. Advance access

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Queensland Alliance for Agriculture and Food Innovation
 
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 11 Aug 2016, 02:10:25 EST by Associate Professor Andrew Borrell on behalf of Centre for Plant Science