Considerations When Deploying Canopy Temperature to Select High Yielding Wheat Breeding Lines under Drought and Heat Stress
Considerations When Deploying Canopy Temperature to Select High Yielding Wheat Breeding Lines under Drought and Heat Stress
复制标题
DOI：
10.3390/agronomy4020191
复制
发表时间：
2014-06-01
期刊：
影响因子：
3.7
通讯作者：
Singh, Ravi P.
中科院分区：
文献类型：
--
作者：
Mason, R. Esten;Singh, Ravi P.
培育对干旱和高温胁迫环境具有更好适应性的品种是植物育种者的优先事项。冠层温度（CT）是一个有用的工具，耐基因型的表型选择，因为它集成了许多生理反应到一个单一的低成本的测量。本研究的目的是确定CT的能力，以预测粮食产量的小麦育种计划的流程内，并评估其效用作为一种工具，间接选择。在墨西哥西北部的高温和干旱胁迫田间试验中，对来自国际玉米和小麦改良中心（CIMMYT）灌溉面包小麦计划的18个育种试验共计504个春小麦品系进行了CT测量。在热处理中，CT在所有试验中与产率显著相关（r = -0.26），在单个试验中的最大决定系数为R-2 = 0.36。在干旱处理中，只有当抽穗天数或株高用作协变量时，才观察到所有试验之间的显著相关性。然而，单个试验内的决定系数具有最大值R-2 = 0.54，表明遗传背景可能影响CT预测产量的能力。总体而言，在热处理的负斜率表明，一个凉爽的冠层提供了压力下的产量效益，并实施CT的选择策略可能有潜力的育种耐受基因型。
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 R-2 = 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 R-2 = 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.