Occurrence of races and pathotypes of cucurbit powdery mildew in southeastern Spain
Occurrence of races and pathotypes of cucurbit powdery mildew in southeastern Spain
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DOI：
10.1007/bf02979750
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发表时间：
2002-01-01
期刊：
影响因子：
1.4
通讯作者：
Torés, JA
中科院分区：
文献类型：
--
作者：
del Pino, D;Olalla, L;Torés, JA
自1996年以来，一直在对西班牙东南部葫芦白粉病的病原进行调查。在获得的139个单孢子分离株中，全部被鉴定为Sphaerotheca fusca。检测到病原体的四个生理小种（1、2、4和5）。在调查过程中，观察到了黑褐鼠的种群变化：I 种族逐渐被其他种族取代。此外，在几个葫芦温室中观察到种族共存。在 S. fusca 分离株中区分出四种宿主范围模式或致病型。所有分离株对甜瓜，特别是西葫芦品种都具有高度攻击性。尽管对西瓜有毒的菌株优先与种族 1 相关，但种族和致病型之间没有明确的关系。这些数据显示西班牙东南部的 S..fusca 种群存在明显的异质性，应进一步分析。
The causal agent of cucurbit powdery mildew in southeastern Spain has been investigated since 1996. Of the 139 single-spore isolates obtained, all were identified as Sphaerotheca fusca. Four physiological races (1, 2, 4 and 5) of the pathogen were detected. During the survey, a population shift of S. fusca was observed: race I was progressively replaced by other races. In addition, race coexistence was observed in several cucurbit greenhouses. Four host range patterns or pathotypes were distinguished among the isolates of S. fusca. All isolates were highly aggressive on melon and especially on zucchini cultivars. No clear relationships between races and pathotypes could be established, although isolates virulent on watermelon were preferentially associated with race 1. These data show an apparent heterogeneity of S..fusca populations in southeastern Spain that should be analyzed further.