Programa de Magister en Manejo de Suelo y Aguas, Escuela de Postgrado Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile.
Departamento de Agronomía, Facultad de Ciencias, Universidad de la Serena, Avenida La Paz 1108, Ovalle 1842646, Chile.
Funct Plant Biol. 2024 Sep;51. doi: 10.1071/FP24008.
The water relation strategy is a key issue in climate change. Given the difficulty of determining water relations strategy, there is a need for simple traits with a solid theoretical basis to estimate it. Traits associated with resource allocation patterns along a 'fast-slow' plant economics spectrum are particularly compelling, reflecting trade-offs between growth rate and carbon allocation. Avocado (Persea americana ), fig tree (Ficus carica ), mandarin (Citrus reticulata ), olive (Olea europaea ), pomegranate (Punica granatum ), and grapevine (Vitis vinifera ) were characterised in terms of iso-anisohydric strategy through stomatal behaviour, water potential at the turgor loss point (TLP), and hydroscape area. Additionally, the association of these metrics with leaf mass per area (LMA) and wood density (WDen) was explored. We observed high coordination between LMA and WDen, and both traits were related to metrics of water relation strategy. More anisohydric species tended to invest more carbon per unit leaf area or unit stem volume, which has implications for hydraulic efficiency and water stress tolerance. WDen and TLP were the most powerful traits in estimating the water relation strategy for six fruit species. These traits are easy to measure, time-cost efficient, and appear central to coordinating multiple traits and behaviours along the water relations strategies.
水分关系策略是气候变化中的一个关键问题。鉴于确定水分关系策略的难度，需要有简单的、具有坚实理论基础的特征来估计它。与沿着“快速-缓慢”植物经济谱分配资源模式相关的特征特别引人注目，反映了增长率和碳分配之间的权衡。鳄梨（Persea americana）、无花果树（Ficus carica）、蜜桔（Citrus reticulata）、油橄榄（Olea europaea）、石榴（Punica granatum）和葡萄藤（Vitis vinifera）通过气孔行为、膨压损失点（TLP）的水势和水力景观面积来确定等水异速策略的特征。此外，还探讨了这些指标与叶面积质量（LMA）和木材密度（WDen）的相关性。我们观察到 LMA 和 WDen 之间具有高度协调性，这两个特征都与水分关系策略的指标有关。更加等水异速的物种倾向于每单位叶面积或单位茎体积投入更多的碳，这对水力效率和水分胁迫耐受性有影响。WDen 和 TLP 是估计六种水果物种水分关系策略的最有力特征。这些特征易于测量，时间成本效益高，并且似乎是协调水分关系策略沿线多个特征和行为的核心。
