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首页> 外文期刊>Forest Pathology >Xylem vessel diameter as a factor in resistance of Ulmus minor to Ophiostoma novo-ulmi
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Xylem vessel diameter as a factor in resistance of Ulmus minor to Ophiostoma novo-ulmi

机译：木质部血管直径是小额榆对新皮癣的抗性因素

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An investigation has been carried out to study the relationship between the susceptibility of Ulmus minor to Ophiostoma novo-ulmi and the diameter of its xylem vessels. Vessel diameters have been analysed in seven Spanish elms of known susceptibility, taking measurements from second and third year rings in 3-year-old branches. In the second year rings no relationship could be observed between the vessel diameters and the susceptibility of the trees. In the third year rings the mean diameter and the percentage of vessels larger than 100 pm were found to be significantly greater for the group of elms of high susceptibility. In the third year rings the vessel transectional area (VTA) and the theoretical hydraulic conductance (THC) were calculated. The decrease in VTA and THC became increasingly noticeable in the group of high susceptibility elms as vessels of larger diameter were excluded fron the calculation, Xylem vessel diameters and the proportion of large vessels were. U. minor correlated with the susceptibility or to Dutch elm disease. How these properties influence the dispersal of the fungus, the sap now and the tree's ability to compartmentalize the disease is discussed.
机译：已经进行了研究以研究小榆树对新生蛇眼的敏感性与木质部血管直径之间的关系。在七个已知敏感性的西班牙榆树中，对血管直径进行了分析，并从3岁的树枝上的第二年和第三年环进行了测量。在第二年的年轮中，在容器直径和树木的敏感性之间没有发现任何关系。在第三年环中，对于高敏感性榆树，平均直径和大于100 pm的血管百分比显着更大。在第三年的年轮中，计算了血管的横截面积（VTA）和理论水力传导率（THC）。 VTA和THC的降低在高易感性榆树组中变得越来越明显，因为从计算中排除了较大直径的血管，木质部血管直径和较大血管的比例。小U.与易感性或荷兰榆病相关。讨论了这些特性如何影响真菌的扩散，现在的汁液以及树木对疾病的隔离能力。

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