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- Title
New source of black rot disease resistance in Brassica oleracea and genetic analysis of resistance.
- Authors
Saha, Partha; Kalia, Pritam; Sharma, Munish; Singh, Dinesh
- Abstract
Black rot is the most widespread and devastating disease in Brassica oleracea crops. The objective of this work was to identify new sources of resistance to races 1 and 4 of Xcc in 46 B. oleracea accessions and to understand genetics of resistance. Most of the accessions were susceptible to both the races, except accessions BR-207, BR-1, BR-202-2 and AL-15 of botrytis group to Xcc race 1. The partial resistant plants were observed in some accessions BR-202-2 (90 % plants) and AL-27 (10 % plants) of botrytis, DJ8012 (20 % plants) of capitata, 005426 (10 % plants) of italica. All the accessions were susceptible to Xcc race 4 except one accession (DJ8012) in cabbage ( capitata group) with mean disease score of 7.0 and 10 % plants were found partial resistant. The genetics of resistance in accession BR-207 ( botrytis group) was investigated by crossing this with susceptible accessions (Pusa Himjyoti and Pusa Sharad). For the genetics study, F, F, F and backcrosses (BCP and BCP) generations of (Pusa Himjyoti x BR-207) and (Pusa Sharad x BR-207) were evaluated. Segregation ratios obtained were compared by Chi square test at 5 % probability. The F generations were resistant and segregation ratio of resistant and susceptible plants indicated 3(R):1(S) in F and 1(R):2 (Seg):1(S) in F which suggested that resistance to Xcc race 1 in BR-207 is governed by a single dominant gene. The information obtained in this study could be valuable for black rot resistance breeding and in planning a systematic breeding programme to incorporate the black rot resistance into the susceptible cultivars.
- Subjects
BLACK rot; COLE crops; PLANT genetics; BOTRYTIS; CHI-squared test
- Publication
Euphytica, 2016, Vol 207, Issue 1, p35
- ISSN
0014-2336
- Publication type
Article
- DOI
10.1007/s10681-015-1524-y