Article | 06. 2016 Vol. 34, Issue. 3
Resistance of Cabbage Plants to Isolates of Plasmodiophora brassicae

Center for Eco-friendly New Materials, Korea Research Institute of Chemical Technology1
Joeun Seeds2

2016.06. 442:452


Clubroot caused by Plasmodiophra brassicae Woron. is one of the most important diseases in Brassica crops worldwide. To investigate resistance of cabbage to disease caused by P. brassicae isolates, we evaluated development of clubroot on commercial clubroot resistant (CR) and non-CR cultivars, a CR line, and F3 lines from a cross between a CR line and a non-CR line using several isolates of P. brassicae. Four P. brassicae isolates (DJ, HN1, GN1, and YC) were used to measure development of clubroot on 16 non-CR cabbage cultivars that have been commercialized in Korea. Although four P. brassicae isolates induced similar disease severity on non-CR Chinese cabbage, these isolates exhibited different virulence on the cabbage cultivars. The YC isolate was the most virulent, followed by the GN1, HN1, and DJ isolates. Despite differences in virulence of the isolates on the cabbage cultivars, a CR cabbage line ‘YCR478’ and two CR cabbage cultivars showed high resistance to 12 P. brassicae isolates including DJ, HN1, GN1, and YC. When three isolates (YC, GN1, and DJ) were inoculated onto 107 F3 lines that were derived from a cross between ‘YCR478’ and a susceptible cabbage line ‘C1176’, our results showed that 89, 33, and 6 of F3 lines were susceptible to YC, GN1, and DJ isolates, respectively. In aspects of resistance, 6, 36, and 67 of F3 lines exhibited resistant responses to YC, GN1, and DJ isolates, respectively. Taken together, these results suggest that resistance of cabbage to clubroot is likely affected by the virulence of P. brassicae isolates.

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