Severe Decline of Wax Apple Trees Caused by Fusarium solani in Northern Taiwan

蓮霧是台灣重要果樹之一，2003年在台灣北部郊區發現蓮霧樹有嚴重衰亡現象。由罹病樹枝常分離到的真菌，根據其型態鑑定爲Fusarium solani。此菌的ITS序列與基因庫同種菌的序列有92.0到98.6%的相似度，其28S序列則有93.0到99.6%的相似度，此菌接種到健康蓮霧樹枝，可使之產生與自然界一樣的病徵。由得病的樹枝又可分離到相同的菌，因而通過柯霍氏法則證明蓮霧樹枝死亡是由F. solani所引起，因此而造成蓮霧樹的衰亡。罹病樹枝剖開，放在潮濕的環境會產生許多微分生孢子，因此罹病樹枝是病樹第二次感染的主要病源，也是健康樹第一次感染的主要病源。

關鍵字

蓮霧；樹枝枯萎；茄鐮孢菌；樹衰亡

並列摘要

Wax apple (Syzygium samarangense) is an important fruit crop in Taiwan. Severe decline of wax apple trees was noticed in 2003 in northern suburban Taiwan. A fungus consistently isolated from diseased twigs of declining wax apple trees, was identified as Fusarium solani based on morphological characteristics. Fusarium solani from wax apple shared 92.0 to 98.6% and 93.0 to 99.6% intraspecific sequence similarity of ITS and 28S, respectively, with those available in GenBank. Upon inoculation, the isolated F. solani caused twig blight on healthy wax apple trees, and F. solani was reisolated from the diseased twigs, thus fulfilling Koch's postulates. All the control trees remained healthy throughout the experiment. Numerous microconidia of F. solani produced on the cut surfaces of diseased twigs under moist conditions were considered to be the main inoculum source for secondary infection of diseased trees and primary infection of healthy trees.

並列關鍵字

Fusarium solani ； ITS ； 28S ； Sequence similarity ； Tree decline

國際替代計量

Severe Decline of Wax Apple Trees Caused by Fusarium solani in Northern Taiwan

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