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Agronomy 2014, 4(2), 191-201; doi:10.3390/agronomy4020191

Considerations When Deploying Canopy Temperature to Select High Yielding Wheat Breeding Lines under Drought and Heat Stress

1
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 115 Plant Sciences Building, Fayetteville, AR 72701, USA
2
International Maize and Wheat Improvement Center (CIMMYT), Apdo Postal 6-641, C.P. 06600, D.F. Mexico
*
Author to whom correspondence should be addressed.
Received: 15 January 2014 / Revised: 21 February 2014 / Accepted: 1 April 2014 / Published: 11 April 2014
(This article belongs to the Special Issue Field Phenotyping for Yield and Environmental Stress Tolerance Traits)
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Abstract

Developing cultivars with improved adaptation to drought and heat stressed environments is a priority for plant breeders. Canopy temperature (CT) is a useful tool for phenotypic selection of tolerant genotypes, as it integrates many physiological responses into a single low-cost measurement. The objective of this study was to determine the ability of CT to predict grain yield within the flow of a wheat breeding program and assess its utility as a tool for indirect selection. CT was measured in both heat and drought stressed field experiments in northwest Mexico on 18 breeding trials totaling 504 spring wheat lines from the International Maize and Wheat Improvement Center (CIMMYT) Irrigated Bread Wheat program. In the heat treatment, CT was significantly correlated with yield (r = −0.26) across all trials, with a maximum coefficient of determination within the individual trials of R2 = 0.36. In the drought treatment, a significant correlation across all trials was only observed when days to heading or plant height was used as a covariate. However, the coefficient of determination within individual trials had a maximum of R2 = 0.54, indicating that genetic background may impact the ability of CT to predict yield. Overall a negative slope in the heat treatment indicated that a cooler canopy provided a yield benefit under stress, and implementing selection strategies for CT may have potential for breeding tolerant genotypes. View Full-Text
Keywords: wheat; physiology; canopy temperature; abiotic stress; heat stress; drought stress; plant breeding wheat; physiology; canopy temperature; abiotic stress; heat stress; drought stress; plant breeding
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mason, R.E.; Singh, R.P. Considerations When Deploying Canopy Temperature to Select High Yielding Wheat Breeding Lines under Drought and Heat Stress. Agronomy 2014, 4, 191-201.

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