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首页> 外文OA文献 >Effects of prolonged drought on stem non-structural carbohydrates content and post-drought hydraulic recovery in Laurus nobilis L.: The possible link between carbon starvation and hydraulic failure
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Effects of prolonged drought on stem non-structural carbohydrates content and post-drought hydraulic recovery in Laurus nobilis L.: The possible link between carbon starvation and hydraulic failure

机译：长期干旱对月桂树茎中非结构性碳水化合物含量和干旱后水力恢复的影响：碳饥饿与水力衰竭之间的可能联系

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摘要

Drought-induced tree decline is a complex event, and recent hypotheses suggest that hydraulic failure and carbon starvation are co-responsible for this process. We tested the possible role of non-structural carbohydrates (NSC) content on post-drought hydraulic recovery, to verify the hypothesis that embolism reversal represents a mechanistic link between carbon starvation and stem hydraulics. Measurements were performed in laurel plants subjected to similar water stress levels either over short or long term, to induce comparable embolism levels. Plants subjected to mild and prolonged water shortage (S) showed reduced growth, adjustment of turgor loss point driven by changes in both osmotic potential at full turgor and bulk modulus of elasticity, a lower content of soluble NSC and a higher content of starch with respect to control (C) plants. Moreover, S plants showed a lower ability to recover from xylem embolism than C plants, even after irrigation. Our data suggest that plant carbon status might indirectly influence plant performance during and after drought via effects on xylem hydraulic functioning, supporting the view of a possible mechanistic link between the two processes.
机译：干旱引起的树木衰落是一个复杂的事件，最近的假设表明，水力衰竭和碳饥饿是这一过程的共同原因。我们测试了非结构性碳水化合物（NSC）含量对干旱后水力恢复的可能作用，以验证以下假设：栓塞逆转代表碳饥饿与茎水力之间的机械联系。在月桂树植物中进行了短期或长期处于相似水分胁迫水平的测量，以诱导可比较的栓塞水平。遭受轻度和长期缺水（S）的植物表现出生长减慢，由于全膨润土渗透势和弹性体弹性模量的变化而驱动的膨松损失点调节，可溶性NSC含量较低和淀粉含量较高控制（C）植物。而且，即使灌溉后，S植物也比C植物显示出较低的木质部栓塞恢复能力。我们的数据表明，植物碳的状况可能通过影响木质部水力功能而间接影响干旱期间和干旱后的植物性能，从而支持了这两个过程之间可能存在机械联系的观点。

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