Effect of temperature on conidial germination, mycelial growth and aggressiveness of the defoliating and nondefoliating pathotypes of Verticillium dahliae from cotton in China

文献类型： 外文期刊

第一作者： Xu, Fei

作者： Xu, Fei;Yang, Long;Zhang, Jing;Li, Guoqing;Xu, Fei;Yang, Long;Zhang, Jing;Li, Guoqing;Xu, Fei;Guo, Xiaoping;Zhang, Xianlong

作者机构：

关键词： Verticillium dahliae;D-pathotype;ND-pathotype;Gossypium hirsutum

期刊名称：PHYTOPARASITICA （ 影响因子：1.439； 五年影响因子：1.569 ）

ISSN： 0334-2123

年卷期： 2012 年 40 卷 4 期

页码：

收录情况： SCI

摘要： Three defoliating (D) pathotype isolates and five nondefoliating (ND) pathotype isolates of Verticillium dahliae from cotton in central China were tested for adaptation to various temperatures in conidial germination on water agar (10-33A degrees C), mycelial growth on potato dextrose agar (10-33A degrees C) and infection of cotton seedlings (Gossypium hirsutum cvs. 'E Mian 24' and 'Yin Rui 361') (25-33A degrees C). Results showed that the D-pathotype isolates adapted better than the ND-pathotype isolates to 30A degrees C for conidial germination and mycelial growth, although the isolates of the two pathotypes had the same optimum temperature of 25A degrees C. Under day/night temperatures of 25/25, 27/27 and 30/25A degrees C for 20 and 25 days, the D-pathotype isolates induced the defoliation syndrome on seedlings of the two upland cotton cultivars, whereas the ND-pathotype isolates did not induce defoliation syndrome. The values for the areas under the disease progress curve (AUDPC) and the vascular discoloration index (VDI) were higher for the D-pathotype isolates than those for the ND-pathotype isolates in each temperature treatment. Under 30/30 or 33/27A degrees C, at least two of the three D-pathotype isolates still had higher AUDPC values and/or VDI values than all the ND-pathotype isolates on E Mian 24. Therefore, the D-pathotype isolates appear more aggressive than the ND-pathotype isolates in infection of cotton. Results also showed that the cotton cultivar Yin Rui 361 was more tolerant than the cotton cultivar E Mian 24 to infection by both pathotypes of V. dahliae. This study suggests that the D-pathotype isolates can well adapt to high temperature and heavily infect cotton under 25-30A degrees C, and these features might be responsible for the rapid spread of this pathotype in central China.

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