冠层温度降低作为干旱筛选的有效生理性状

P. Sofi, Asmat Ara, M. Gull, Khalid Rehman
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引用次数: 13

摘要

缺水是世界范围内农业生产的主要制约因素。对大量个体进行显型所需的时间、相关性差或不一致以及涉及的多种机制,无一例外地阻碍了耐旱育种的努力。鉴于作物的大量自然变异及其与产量的相关性,冠层温度下降已成为一种潜在的替代方法。基于实验结果,提出了两种基于CTD的理想型模型:等水型(节水型)和各向异性(耗水型)。等水力学在恶劣环境下具有优势,而各向异性在中/轻度干旱条件下表现更好。节水植物根系浅,根系生长中等,根系细。它们发育早,水分利用效率高,蒸腾作用低,叶面积和冠层生物量发育有限,光合作用对豆荚和籽粒的再动员能力强。与此相反,耗水植物根系生长迅速,根系较粗,根系发育旺盛,根系较深。这些基因型发育早,水分利用效率高,蒸腾作用适中,叶面积和冠层生物量发育快,汇强度适中,光合作用对荚果和籽粒形成的再动员能力强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Canopy Temperature Depression as an Effective Physiological Trait for Drought Screening
Water stress is a major production constraint in agriculture worldwide. Efforts to breed for drought tolerance are invariably hampered by the amount of time required to phenotype a large number of individuals and poor or inconsistent correlations and multiple mechanisms involved. Canopy temperature depression has emerged as a potential surrogate in view of substantial natural variation in crops as well as its correlation with yield. Based on the experimental findings two types of ideotype models based on CTD have been proposed as isohydric (“water sav-ing”) and anisohydric (“water spending”). The isohydrics have advantage in the harsher environments, whereas the anisohydrics perform better under moderate/ mild drought situations. Water savers have a shallow root system with intermediate root growth and thin roots. They are early and have high water use efficiency, reduced transpiration and limited leaf area and canopy biomass development and superior photosynthate remobilization to pod and grain. Contrary to this, water spenders have a vigorous and deep rooting system with rapid root growth and a thicker root system. Such genotypes are early and have highly effective water use, moderate transpiration and fast leaf area and canopy biomass development, moderate sink strength and superior photosynthate remobilization to pod and grain formation.
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