Morphological and Pathogenic Variability in Different Isolates of Fusarium oxysporum f. sp. cumini

S. Choudhary, S. Godika
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Abstract

Wilt of cumin incited by Fusarium oxysporum f. sp. cumini is one of the important disease and a big constraint in successful cultivation.  Therefore, in the present study, 7 isolates of Fusarium oxysporum f. sp. cumini collected from different cumin growing areas of Rajasthan were assessed for morphological and pathogenic variations. The different isolates produced sickle shaped macro conidia and spores of varying width, length having variable number of septa. The isolate I2 produced highest length and number of septa in macro conidia. The length of macro conidia varied from 22.77 µm in isolate I3 to 29.65 µm in isolate I2 whereas, micro conidia length varied from 7.54 µm in I4 to 11.53 µm in I6. In study of pathogenic variability, among different isolate, the isolate I1 proved most virulent as it showed disease symptoms earliest whereas, isolate I5 proved least virulent.
黄瓜尖孢镰刀菌不同分离株的形态及致病变异
小茴香枯萎病(Fusarium oxysporum f. sp. cumini)是小茴香的重要病害之一,也是成功栽培的一大制约因素。因此,本研究对从拉贾斯坦邦不同孜然种植区采集的7株枯镰刀菌进行了形态和致病变异分析。不同的分离株产生镰刀状的大分生孢子和孢子,孢子的宽度、长度和间隔数不等。分离物I2在大分生孢子中产生的间隔长度和数量最多。分离物I3的大分生孢子长度为22.77µm ~ 29.65µm,分离物I2的小分生孢子长度为7.54µm ~ 11.53µm。在致病变异性的研究中,不同的分离物中,分离物I1表现出最早的发病症状,毒力最强,而分离物I5表现出最低的毒力。
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