Variation in pathogenicity ofAscochyta rabiei onchickpeas
作者:
S. R. Gowen,
M. Orton,
B. Thurley,
A. White,
期刊:
Tropical Pest Management
(Taylor Available online 1989)
卷期:
Volume 35,
issue 2
页码: 180-186
ISSN:0143-6147
年代: 1989
DOI:10.1080/09670878909371353
出版商: Taylor & Francis Group
关键词: Chickpea;Ascochyta;blight;resistance
数据来源: Taylor
摘要:
Studies of the geographic variability ofAscochyta rabieiwere done using chickpea cultivars of differing susceptibility under uniform growth room conditions. The pathogenicity of certain isolates particularly those from the Indian subcontinent and Western Asia was greater than that of most isolates collected in the Western Mediterranean. Several cultivars already deployed in breeding programmes showed stable resistance to the fungus, others with intermediate levels of resistance were less stable when exposed to a high disease pressure developed by the repeated passaging of isolates through them. In general differences in pathogenicity were attributed to variations in aggressiveness shown by the constant ranking of the cultivars used. Sporulation may not be linked to pathogenicity and significant statistical interactions with reversals in cultivar rankings suggests this to be an area for further study. Resistance toA. rabieiseems to be polygenic or at least oligogenic. In conditions of prolonged disease pressure some barriers to infection and/or spoulation may be overcome by pathogenic adaptation.
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