Phenotypic plasticity of bread wheat contributes to yield reliability under heat and drought stress

作者：Jatinder S. Sangha, Weiwei Wang, R. E. Knox, Yuefeng Ruan, Richard D. Cuthbert, Julio Isidro y Sánchez, Lin Li, Yong He, R. M. DePauw, Asheesh K. Singh, Adrian J. Cutler, Hong Wang, Gopalan Selvaraj · 发表于：PLoS ONE · 年份：2025 · DOI：10.1371/journal.pone.0312122 · 被引用次数：8 · 研究领域：Wheat and Barley Genetics and Pathology、Genetics and Plant Breeding、Plant Water Relations and Carbon Dynamics

Yield reliability under diverse environments is important to address climate stress consequences in wheat production systems. Breeding for reliability under a changing climate remains a challenge in wheat. We assessed the performance of 18 hexaploid (Triticum aestivum L.) genotypes in three field environments at a location within the semi-arid Canadian Prairies over four years with a primary aim to establish knowledge of the phenotypic plasticity and yield reliability in the parental lines as it relates to heat and drought stress tolerance. We collected data on various physiological traits along with some agronomic and morphological attributes, uncovering significant variation across early seeded rainfed, early seeded irrigated, and late seeded rainfed (hot and dry) environments. Eight high yielding hexaploid genotypes '01S0263-28', 'AC Foremost', AC Karma', 'Cutler', 'MN03358-4', 'Reeder', 'Stettler', and 'Superb' showed higher grain Δ13C. Six of these genotypes '01S0263-28', 'AC Foremost', 'MN03358-4', 'Reeder', 'Stettler', and 'Superb' showed higher water use efficiency under irrigated as well as hot and dry environment compared to the low yielding lines 'Red Fife','8021-V2' and 'BW278'. Only four genotypes '01S0263-28', 'MN03358-4', 'Reeder', and 'Stettler' were found with higher yield reliability index. The grain yield relationship with leaf rolling, glaucousness, and canopy temperature was found to be weak. The flag leaf stomatal numbers increased with water stress in h...