Performance of cauliflower genotypes for yield and resistance against black rot (Xanthomonas campestris pv. campestris)
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Cauliflower, Brassica oleracea var. botrytis, yield component, resistance, black rot, Xanthomonas campestris pv. campestrisIssue
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Copyright (c) 2014 Indian Journal of Horticulture
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Abstract
Black rot disease of cole crops caused by Xanthomonas campestris pv. campestris occurs worldwide and causes substantial yield loss (10-50%) including curd quality and seed vigour. Resistant varieties are very much lacking in cauliflower due to non availability of resistant donors. Twenty one breeding lines/ varieties of cauliflower belonging to early and mid maturity groups were evaluated for marketable curd yield, curd quality and also screened artificially against 4 virulent strains of X. campestris pv. campestris (Xcc-C1, Xcc-C3, Xcc- C26 and Xcc-C28) for the disease resistance. The curd maturity ranged from 50-72 days after transplanting and marketable curd weight from 253-750 g. Among the early genotypes, PN-1 produced good quality white and compact curd (238.33 q/ha) and among mid maturity group DCH 822 produced 375.00 q/ha followed by DC-76 (311.67 q/ha). Significant disease incidence (59-100%) and severity (3.95-5.34) against 4 pathogen strains were recorded, however, PN-1 and VLCE-4 showed the minimum disease intensity (<60%) among the lines tested. Most of the lines showed partial resistance or moderate resistance, while IVMC-11 and PES showed susceptible reaction to black rot. The lines PN-1, VLCE-10, DC-76, DCH-822 showed high yield potential with better curd quality coupled with moderate resistance to black rot.
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