数字农科院2.0

New host resistances to Pseudocercosporella capsellae and implications for white leaf spot management in Brassicaceae crops

文献类型： 外文期刊

作者： Gunasinghe, Niroshini;You, Ming Pei;Barbetti, Martin J.;Barbetti, Martin J.;Li, Xi Xiang;Banga, Surinder S.;Banga, Shashi K.

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关键词： Brassica;White leaf spot;Pseudocercosporella capsellae;Resistance;Oilseed rape;Mustard;Cabbage

期刊名称： CROP PROTECTION

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收录情况： SCI

摘要： Effective host resistance is the most cost-effective long term prospect for successful management of white leaf spot disease (Pseudocercosporella capsellae) in Brassicaceae. In two separate field trials, 168 genotypes were screened. In the first trial, lines of Brassica oleracea var. capitata (59), Brassica napus (34), Brassica juncea (6) and B. juncea containing wild weedy Brassicaceae introgression(s) (14) were arranged; and in the second, Australian historic and current B. napus (45) and B. juncea (10) varieties were screened. There was wide variation in expression of resistance, from complete resistance to highly susceptible as assessed by two disease parameters, viz. (i), Area Under Disease Progress Curve (AUDPC) for percent leaves diseased (values 0-221.2) and (ii) Percent Leaf Collapse Index (%LCI) values for leaf collapse due to disease (0-38.7). Brassica oleracea var. capitata was overall the most resistant species, while B. juncea the most susceptible with the majority having AUDPC values >75 and B. napus was intermediate. Five B. oleracea var. capitata genotypes were completely resistant, with 0 AUDPC and %LCI values. Pioneer (R) 45Y22 (RR) 'Mystic' and 'Wahoo' were also highly resistant, with the least %LCI (<3.7) and AUDPC (<20) of the Australian B. napus varieties. In contrast, 'Thunder TT' (AUDPC-133.6; %CLI - 15.6) and 'Carbine' (AUDPC - 73.8; %CLI - 12.5) were the most susceptible lines in first and second trials, respectively. The particularly high susceptibility of newly released B. juncea varieties such as 'Xceed OasisCL' highlights the risk of significant losses in such susceptible varieties when deployed in areas with high degree of pressure for white leaf spot disease. There was no association between AUDPC or % CLI with year of Australian varietal release, indicating that Australian breeding programs not made improvement for resistance to white leaf spot over the past two or more decades. Resistant varieties identified in this experiment can now not only be utilized in breeding programs to significantly improve overall crop resistance and management of white leaf spot disease, but also directly deployed to lower the severe inoculum load challenging current varieties. (C) 2016 Elsevier Ltd. All rights reserved.

分类号： S43

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