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首页> 外文OA文献 >Drought-Induced Xylem Dysfunction in Petioles, Branches, and Roots of Populus balsamifera L. and Alnus glutinosa (L.) Gaertn.
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Drought-Induced Xylem Dysfunction in Petioles, Branches, and Roots of Populus balsamifera L. and Alnus glutinosa (L.) Gaertn.

机译：干旱引起的小叶杨，叶杨和and木的叶柄，枝和根的木质部功能障碍。

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Variation in vulnerability to xylem cavitation was measured within individual organs of Populus balsamifera L. and Alnus glutinosa (L.) Gaertn. Cavitation was quantified by three different techniques: (a) measuring acoustic emissions, (b) measuring loss of hydraulic conductance while air-dehydrating a branch, and (c) measuring loss of hydraulic conductance as a function of positive air pressure injected into the xylem. All of these techniques gave similar results. In Populus, petioles were more resistant than branches, and branches were more resistant than roots. This corresponded to the pattern of vessel width: maximum vessel diameter in 1- to 2-year-old roots was 140 [mu]m, compared to 65 and 45 [mu]m in rapidly growing 1-year-old shoots and petioles, respectively. Cavitation in Populus petioles started at a threshold water potential of -1.1 MPa. The lowest leaf water potential observed was -0.9 MPa. In Alnus, there was no relationship between vessel diameter and the cavitation response of a plant organ. Although conduits were narrower in petioles than in branches, petioles were more vulnerable to cavitation. Cavitation in petioles was detected when water potential fell below -1.2 MPa. This value equaled midday leaf water potential in late June. As in Populus, roots were the most vulnerable organ. The significance of different cavitation thresholds in individual plant organs is discussed.
机译：测量了胡杨（Bopulus balsamifera L.）和谷nu（Alnus glutinosa（L.）Gaertn）各个器官对木质部空化的脆弱性变化。空化通过三种不同的技术进行量化：（a）测量声发射，（b）测量分支空气脱水时的水力传导损失，以及（c）测量作为注入木质部的正气压的函数的水力传导损失。所有这些技术都给出了相似的结果。在杨树中，叶柄的抗性强于分支，而分支的抗性强于根。这与脉管宽度的模式相对应：1-2岁的根的最大脉管直径为140μm，相比之下，快速生长的1岁的新芽和叶柄的最大脉管直径为65和45μm，分别。胡杨叶柄的空化作用始于-1.1 MPa的临界水势。观察到的最低叶水势为-0.9 MPa。在Alnus，容器直径与植物器官的空化反应之间没有关系。尽管叶柄的导管比分支的导管窄，但叶柄更容易发生气蚀。当水势降至-1.2 MPa以下时，可检测到叶柄中的空化。该值等于6月下旬的午间叶片水势。和胡杨一样，根是最脆弱的器官。讨论了在单个植物器官中不同空化阈值的重要性。

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    Hacke, U.; Sauter, J. J.;

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  • 年度 1996
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  • 正文语种 en
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