The effect of multiple importations of pests and pathogens on a native tree
The effect of multiple importations of pests and pathogens on a native tree
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DOI：
10.1023/a:1015205005751
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发表时间：
2001-01-01
影响因子：
2.9
通讯作者：
Anagnostakis, Sandra L.
中科院分区：
文献类型：
--
作者：
Anagnostakis, Sandra L.
过去的气候变化重塑了北美的原始森林，一些物种在数量和分布上增加了，另一些物种减少了。美洲原住民的栗子曾经很丰富，但已经被两种进口病原体从森林树冠中消灭，并且还受到进口害虫的威胁。这些树在一种病原体中存活下来，但很少比林下灌木大。这些丛生的新芽提供了一个遗传多样性的水库，用于恢复这种树到其森林栖息地。一种外来的寄生虫可以用来控制一种病原体，并使芽长得足够大，可以开花。然后，这些树可以与对这两种病原体都具有良好抗性的其他物种的进口栗子杂交，并选择抗性后代。在处理这些外来问题方面已取得良好进展。
Climate changes in the past reshaped the North American native forests as some species increased and others decreased in number and distribution. Native American chestnuts were once abundant, but have been eliminated from the forest canopy by two imported pathogens, and are additionally threatened by an imported pest. The trees survive one of the pathogens, but rarely become larger than understory shrubs. These clumps of sprouts provide a reservoir of genetic diversity for use in reinstating this tree into its forest habitat. An imported parasite can be used to control one pathogen and allow the sprouts to grow large enough to flower. The trees can then be crossed with imported chestnuts of other species with good resistance to both pathogens, and resistant offspring selected. Good progress has been made in coping with these imported problems.