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Association mapping and genetic dissection of drought-induced canopy temperature differences in rice

Lookup NU author(s): Dr Ankush Prashar

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Oxford University Press, 2020.

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Abstract

Drought-stressed plants display reduced stomatal conductance, which results in increased leaf temperature by limiting transpiration. In this study, thermal imaging was used to quantify the differences in canopy temperature under drought in a rice diversity panel consisting of 293 indica accessions. The population was grown under paddy field conditions and drought stress was imposed for 2 weeks at flowering. The canopy temperature of the accessions during stress negatively correlated with grain yield (r = -0.48) and positively with plant height (r = 0.56). Temperature values were used to perform a genome-wide association (GWA) analysis using a 45K-SNP map. A QTL for canopy temperature under drought was detected on chromosome 3 and fine-mapped using a high-density imputed SNP map. The candidate genes underlying the QTL point towards differences in the regulation of guard cell solute intake for stomatal opening as the possible source of temperature variation. Genetic variation for the significant markers of the QTL was present only within the tall, low-yielding landraces adapted to drought-prone environments. The absence of variation in the shorter genotypes, which showed lower leaf temperature and higher grain yield, suggests that breeding for high grain yield in rice under paddy conditions has reduced genetic variation for stomatal response under drought.


Publication metadata

Author(s): Melandri G, Prashar A, McCouch SR, van der Linden G, Jones HG, Kadam NN, Jagadish SVK, Bouwmeester H, Ruyter-Spira C

Publication type: Article

Publication status: Published

Journal: Journal of Experimental Botany

Year: 2020

Volume: 71

Issue: 4

Pages: 1614-1627

Print publication date: 07/02/2020

Online publication date: 17/12/2019

Acceptance date: 19/11/2019

Date deposited: 10/12/2019

ISSN (print): 0022-0957

ISSN (electronic): 1460-2431

Publisher: Oxford University Press

URL: https://doi.org/10.1093/jxb/erz527

DOI: 10.1093/jxb/erz527


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