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首页> 外文期刊>Indian Phytopathology >Cultural, morphological and pathogenic variability of Alternaria tenuissima causing blight in pigeonpea of Eastern Uttar Pradesh
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Cultural, morphological and pathogenic variability of Alternaria tenuissima causing blight in pigeonpea of Eastern Uttar Pradesh

机译：北方北方邦斑豆中引起疫病的链格孢菌（Alternaria tenuissima）的文化，形态和致病性变异

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摘要

Cultural, morphological and pathogenic variabilities of Alternaria tenuissima isolates from pigeonpea were studied. The radial growth of 17 isolates of the pathogen was tested at seven different temperature and PDA medium. The maximum mean radial growth of fungus at temperatures of 25 C and 30 C was superior to other temperatures. Whereas, the lowest mean colony diameter was obtained at temperatures of 10 C and 40 C. The radial growth of 17 isolates was superior at 7.0 pH followed by 6.5 pH at five different pH. The least radial growth was obtained at pH of 8.0. Average growth rate after seven days were found varied from 20.0 to 78.0 mm in different isolates. The isolates were categorized in four groups on the basis of variation in radial growth rate. Ten representative isolates from 17 collections were identified and each isolates differed in their conidial size, morphology, length, beak length, width and septal distance. Among the 12 pigeonpea genotypes evaluated against disease, ICP-7220 was found to be highly resistant to alternaria blight followed by IPA-7-2. The most susceptible genotype was MAL-24. Cumulative aggressiveness of different isolates of A. tenuissima also varied significantly on different pigeonpea genotypes. Two Isolates namelyAt17 and At45 were highly aggressive whereas Isolate At71 was least aggressive on different genotypes of pigeonpea.
机译：研究了来自木豆的链格孢菌（Alternaria tenuissima）分离株的文化，形态和致病性。在七个不同的温度和PDA培养基中测试了17种病原体的放射状生长。在25°C和30°C的温度下，真菌的最大平均径向生长优于其他温度。而最低的平均菌落直径是在10 C和40 C的温度下获得的。17个分离株的放射状生长在7.0 pH下优于在五个不同pH下为6.5 pH。在pH值为8.0时，径向生长最少。发现七天后，不同菌株中的平均生长速率从20.0毫米到78.0毫米不等。根据径向生长速率的变化将分离株分为四组。从17个收集物中鉴定出10个代表性分离株，每个分离株的分生孢子大小，形态，长度，喙长，宽度和间隔距离都不同。在对疾病进行评估的12种木豆基因型中，发现ICP-7220对白叶枯萎病具有高度抗性，其次是IPA-7-2。最易感的基因型是MAL-24。在不同的木豆基因型上，A。tenuissima的不同分离株的累积侵略性也显着不同。 At17和At45这两个分离株对木豆的不同基因型具有高度的侵害性，而At71分离株的侵害性最低。

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