Puglielli Giacomo, Hutchings Michael J, Laanisto Lauri
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, 51006, Estonia.
School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QG, UK.
New Phytol. 2021 Feb;229(3):1354-1362. doi: 10.1111/nph.16952. Epub 2020 Oct 17.
Tolerance of abiotic stress in woody plants is known to be constrained by biological trade-offs between different forms of stress, especially shade and drought. However, there is still considerable uncertainty on the relationship between tolerances and the limits on tolerance combinations. Using the most extensive database available on shade, drought, waterlogging and cold tolerance for 799 northern hemisphere woody species, we determined the number of dimensions needed to summarise their tolerance combinations, and the best trade-off model among those currently available, for description of the interdependence between tolerances. Two principal component analysis (PCA) dimensions summarised stress tolerance combinations. They defined a triangular stress tolerance space (STS). The first STS dimension reflected segregation between drought-tolerant and waterlogging-tolerant species. The second reflected shade tolerance, which is independent of the other tolerances. Cold tolerance scaled weakly with both dimensions. Tolerance combinations across the species in the database were limited by boundary-line trade-offs. The STS reconciles all major theories about trade-offs between abiotic stress tolerances, providing a unified trade-off model and a set of coordinates that can be used to examine how other aspects of plant biology, such as plant functional traits, change within the limits of abiotic stress tolerance.
众所周知，木本植物对非生物胁迫的耐受性受到不同形式胁迫之间生物学权衡的限制，尤其是遮荫和干旱。然而，耐受性与耐受性组合限制之间的关系仍存在相当大的不确定性。利用现有的关于北半球799种木本植物的遮荫、干旱、涝渍和耐寒性的最广泛数据库，我们确定了总结其耐受性组合所需的维度数量，以及目前可用的最佳权衡模型，以描述耐受性之间的相互依存关系。两个主成分分析（PCA）维度总结了胁迫耐受性组合。它们定义了一个三角形胁迫耐受性空间（STS）。第一个STS维度反映了耐旱和耐涝物种之间的分离。第二个维度反映了遮荫耐受性，它与其他耐受性无关。耐寒性与这两个维度的相关性较弱。数据库中各物种的耐受性组合受到边界线权衡的限制。STS协调了关于非生物胁迫耐受性之间权衡的所有主要理论，提供了一个统一的权衡模型和一组坐标，可用于研究植物生物学的其他方面，如植物功能性状，在非生物胁迫耐受性范围内如何变化。
