INDUCED LONG-TERM RESISTANCE OF BIRCH FOLIAGE AGAINST DEFOLIATORS: DEFENSIVE OR INCIDENTAL?
INDUCED LONG-TERM RESISTANCE OF BIRCH FOLIAGE AGAINST DEFOLIATORS: DEFENSIVE OR INCIDENTAL?
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诱导桦树叶对抗落叶害虫的长期抵抗：防御性还是偶然性？
DOI：
10.2307/1939183
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发表时间：
1985
期刊：
影响因子：
4.8
通讯作者：
S. Neuvonen
中科院分区：
文献类型：
--
作者：
E. Haukioja;S. Neuvonen
白色桦树叶片的长期增加的阻力进行人工落叶，这是以前的记录，可能是对叶捕食者的防御反应，或者它可能是被动恶化的叶片质量，由于损失的营养。我们通过两个实验来验证这些假设，其中树叶质量由尺蠖毛虫的生长反应来测定，尺蠖毛虫是我们地区树木的主要食草动物。施肥落叶树周围的土壤并没有消除机械损伤引起的叶片质量的变化，相反的营养压力假说的预测。与防御假说一致的另一个结果是，昆虫损伤是一个更有效的诱导剂在桦树叶片的变化比机械损伤。人工落叶是一个有效的诱导剂在营养贫乏，但不是在营养丰富的网站，这一结果可以解释的两个假设。
The long—term increase in foliage resistance of white birch subjected to artificial defoliation, which has been previously documented, may be a defensive response against leaf predators, or it may be passive deterioration in foliage quality due to lost nutrients. We tested these hypotheses by two experiments in which foliage quality was assayed by the growth response of a geometrid caterpillar that is the tree's major herbivore in our area. Fertilization of the soil around defoliated trees did not eliminate the change in foliage quality caused by mechanical damage, contrary to the prediction of the nutrient—stress hypothesis. Another result consistent with the defensive hypothesis was that insect damage was a more effective inducer of changes in birch foliage than mechanical damages was. Artificial defoliation was an effective inducer in a nutrient—poor but not in a nutrient—rich site; this result can be explained by either of the two hypotheses.