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

Article


Gunasinghe, Niroshini, You, Ming Pei, Li, Xi Xiang, Banga, Surinder S., Banga, Shashi K. and Barbetti, Martin J.. 2016. "New host resistances to Pseudocercosporella capsellae and implications for white leaf spot management in Brassicaceae crops." Crop Protection. 86, pp. 69-76. https://doi.org/10.1016/j.cropro.2016.04.014
Article Title

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

ERA Journal ID5304
Article CategoryArticle
AuthorsGunasinghe, Niroshini (Author), You, Ming Pei (Author), Li, Xi Xiang (Author), Banga, Surinder S. (Author), Banga, Shashi K. (Author) and Barbetti, Martin J. (Author)
Journal TitleCrop Protection
Journal Citation86, pp. 69-76
Number of Pages8
Year2016
PublisherElsevier
Place of PublicationNetherlands
ISSN0261-2194
1873-6904
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cropro.2016.04.014
Abstract

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), B. napus (34), B. 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® 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 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.

KeywordsBrassica; white leaf spot; Pseudocercosporella capsellae; resistance; oilseed rape; mustard; cabbage
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
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File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsUniversity of Western Australia
Chinese Academy of Agricultural Sciences, China
Punjab Agricultural University, India
Institution of OriginUniversity of Southern Queensland
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