Identification of sources of resistance to alternaria leaf spot (Alternaria brassicicola), black rot (Xanthomonas campestris) and downy mildew (Peronospora parasitica) in cauliflower (Brassica oleraceae).

摘要

A total of 45 cauliflower germplasms and advanced breeding lines belonging to early group were screened during 2005-07 against alternaria leaf spot (Alternaria brassicicola), black rot (Xanthomonas campestris) and downy mildew diseases (Peronospora parasitica). Based on the 2 years data, none of the cauliflower germplasm or advanced breeding lines was found resistant to the 3 diseases tested. However IIHR 260-1, IIHR 265, IIHR 302 and IIHR 305-1 were found resistant against downy mildew. Four lines, i.e. IIHR 73-3-20, IIHR 250-4-4-16-27, IIHR 264-3 and IIHR 392 against alternaria leaf spot, and 2 lines, i.e. IIHR 73-56 and IIHR 250-4-1-11-28 against black rot, were found to be moderately resistant.