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On the Relationships between Salinity Tolerance, Growth and Water Use in Citrus

机译：柑橘盐度耐受性，生长和用水的关系

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Based on plant growth and leaf chloride (Cl-)concentration in citrus leaves, we tested the hypothesis that salinity tolerance is associated with plant water use. We modified the growth and water use of salinized citrus rootstock seedlings and ' Valencia' trees using elevated CO2 or shade. Growing well nourished seedlings of Cleopatra mandarin (Cleo, relatively salt tolerant) or Carrizo citrange (Carr, relatively salt sensitive) in elevated CO2increased their growth, total leaf area, shoot/root ratio, leaf dry weight per area, and leaf water use efficiency (WUE) but decreased plant water use relative to seedlings grown at ambient CO2. Seedlings of Carr had higher rates of leaf transpiration (Elf) than Cleo. Elevated CO2 decreased leaf Cl- concentration in Carr but not in Cleo leaves. Thus, salinity tolerance was increased by elevated CO2 in the more salt sensitive Carr but not in the more salt tolerance Cleo. Overall, leaf Cl" was positively related to Elf but negatively related to plant growth and WUE. Growing two-year-old ' Valencia' orange trees grafted on Carr or Cleo rootstocks under 50% shade cloth throughout the growing season, increased net gas exchange of leaves but had no effect on tree growth or leaf transpiration (Elf) relative to trees grown in full sunlight. Shade decreased leaf Cl" concentrations of salinized trees on Carr but did not affect leaf Cl" of trees on Cleo. Leaf Cl" was positively correlated with Elf as both were higher in the spring than in the fall regardless of rootstock or shade treatment. Since low leaf Cl - or salinity tolerance was a function of high growth and low water use, an important mechanism of salinity tolerance was the ability to maintain high water use efficiency under salinity stress.
机译：基于植物生长和植物叶片（CL-）浓度的柑橘叶，我们测试了盐度耐受与植物用水相关的假设。我们使用升高的二氧化碳或阴影修改了盐渍化柑橘砧木幼苗和“瓦伦西亚”树的增长和用水。在升高的Co2incread的生长，总叶面积，枝条/根比例，叶干重的幼苗中，生长康复纯净的幼苗（CLEO，相对耐盐）或Carrizo Citrange（Carr，相对盐敏感），每面积的总叶面积，枝条/根比例，叶片干重，以及叶水使用效率（WUE）但植物用水量减少，相对于在环境CO2上生长的幼苗。 Carr的幼苗比Cleo更高的叶片蒸腾率（ELF）。升高的CO 2减少Carr中的叶子Cl-浓度，但不在Cleo叶中。因此，通过盐敏感Carr的升高的CO 2，但不在耐盐性耐受性耐盐性上，盐度耐受性增加。总体而言，叶子Cl“与植物生长和电力有关的植物呈阳性相关，但与植物生长和电力呈负相关。在整个生长季节的50％遮阳布下嫁接了两岁的'瓦伦西亚'橙树，净气交换增加叶片，但对树木生长或叶片蒸腾（ELF）的影响无关，相对于完全阳光生长的树木。叶子Cl“Carr的盐渍树木浓度，但没有影响Cleo的叶子Cl”。叶子Cl“是与螺旋或鳞片处理无论春季都比春天都呈正相关。由于低叶片或盐度耐受性是高生长和低水量的函数，因此盐度耐受性的重要机制是在盐度应力下保持高水平使用效率的能力。

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