Sources of resistance to Plasmodiophora brassicae (clubroot) pathotypes virulent on canola

摘要: AbstractA collection of 955 Brassica accessions including B. rapa (718), napus (94), juncea (93), oleracea (30), carinata (12) and nigra (8) was screened against Plasmodiophora brassicae pathotype 3 (1 × 106 resting spores cc−1 growth medium), the predominant strain pathogen on canola in western Canada. A total 35 (mostly rapa) showed at least 50% reduced clubroot severity relative to a susceptible control, with 15 showing complete resistance (clubroot-free). Ten resistant representing A-, B- C-genome species were tested further using 10-fold higher inoculum dose (1 × 107 medium) by testing them five pathotypes (2, 3, 5, 6 8) P. found One nigra, two four (oriental vegetable) maintained high level under pressure, while one (turnip) moderate...