Development of Pathogenicity and AFLP to Characterize Fusarium oxysporum f.sp momordicae Isolates from Bitter Gourd in China

文献类型： 外文期刊

第一作者： Li, Qi-Qin

作者： Li, Qi-Qin;Yuan, Gao-Qing;Chen, Zhen-Dong;Huang, Ru-Kui;Wen, Jun-Li;Chen, Zhen-Dong;Huang, Ru-Kui

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关键词： AFLP;bitter gourd;diversity;Fusarium wilt;virulence

期刊名称：JOURNAL OF PHYTOPATHOLOGY （ 影响因子：1.789； 五年影响因子：1.574 ）

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收录情况： SCI

摘要： Bitter gourd (Momordica charantia L.) cultivated in China is regarded as an important vegetable crop and is of considerable economic importance. However, it is susceptible to fusarium wilt, which causes heavy economic losses. Forty-eight isolates were isolated from diseased bitter gourd plants that displayed typical fusarium wilt symptoms. Based on the morphological features, the rDNA internal transcribed space (ITS) sequences, pathogenicity and host biotypes, all of the isolates tested were pathogenic to the susceptible bitter gourd plants species (cv. Guinongke No. 2') and were identified as Fusarium oxysporum f. sp. momordicae (FOM). Our results classified different isolates as slightly, moderately or highly virulent. Among the isolates tested, 43 isolates slightly infected bottle gourd (Lagenaria siceraria var. clavata), whereas they did not infect other species from the family Cucurbitaceae. Genetic diversity among 48 isolates was characterized using amplified fragment length polymorphism (AFLP) analysis. The number of bands amplified by each primer pairs ranged from 41 to 66, with sizes ranging from 200 to 500bp. A total of 366 bands were observed, out of which 363 were polymorphic (99.14%). The Nei's genetic identity of the six geographical populations varied from 0.7362 to 0.9707. The mean Nei's gene diversity index (H=0.2644) and the mean Shannon's information index (I=0.4071) at species level were higher than ones at populations level, indicated that the variation within populations was greater than that among populations. The Nei's GST (0.5103) and gene flow (Nm=0.4923) revealed that genetic differentiation was mainly among populations and few gene exchanges. The dendrogram obtained from AFLP marker showed that there was a good correlation between isolates from different geographical locations and their pathogenicity. The AFLP marker effectively distinguished the high virulent isolates from the less virulent isolates. The highly virulent isolates were distinctly separated in different clusters, which indicated a significantly high correlation with the geographical origin in the AFLP dendrogram. The pathogenicity and molecular marker analysis confirmed the presence of variation in virulence as well as genetic diversity among the FOM isolates studied.

分类号： Q945

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