CLASSIFICATION OF PATHOGENICITY OF PLASMODIOPHORA BRASSICAE FIELD ISOLATES IN JAPAN BASED ON RESISTANCE OF F1 CULTIVARS OF CHINESE CABBAGE (BRASSICA RAPA L.) TO CLUBROOT

2006 ◽  
pp. 323-328 ◽  
Author(s):  
K. Hatakayema ◽  
M. Fujimura ◽  
M. Ishida ◽  
T. Suzuki ◽  
T. Sato
Keyword(s):  
Brassica Rapa ◽  
Chinese Cabbage ◽  
Plasmodiophora Brassicae ◽  
Field Isolates

scholarly journals Resistance to Plasmodiophora brassicae in Brassica rapa and Brassica juncea genotypes From China

Plant Disease ◽  
2015 ◽  
Vol 99 (6) ◽  
pp. 776-779 ◽  
Author(s):  
Hui Zhang ◽  
Jie Feng ◽  
Shujiang Zhang ◽  
Shifan Zhang ◽  
Fei Li ◽  
...  
Keyword(s):  
Brassica Rapa ◽  
Chinese Cabbage ◽  
Significant Interaction ◽  
Plasmodiophora Brassicae ◽  
Inbred Lines ◽  
Vegetable Crops ◽  
Highly Pathogenic ◽  
Clubroot Disease ◽  
Pak Choi ◽  
China Development

Clubroot disease, caused by Plasmodiophora brassicae Woronin, has become a major problem in cruciferous crops worldwide. Chinese cabbage (Brassica rapa), pak choi (B. rapa), and mustard (B. juncea) are important vegetable crops in China. Development of clubroot-resistant cultivars of these crops is urgently needed. In this study, 71 B. rapa and B. juncea genotypes from China, including cultivars and inbred lines, were evaluated for resistance to three P. brassicae pathotypes. A significant interaction was observed between the P. brassicae pathotypes and the Brassica genotypes. Pathotype 3, as defined on the differentials of Williams, exhibited the weakest virulence on all plant material. By contrast, pathotypes 5 and 6 were both highly pathogenic on most of the tested genotypes. In all, 10 of the 14 Chinese cabbage cultivars were resistant to all three pathotypes, while 4 were resistant only to a specific pathotype. Seven of eight progenies obtained from the selfing of Chinese cabbage cultivars were resistant to pathotype 3 but most were susceptible to pathotypes 5 and 6. Most inbred lines of Chinese cabbage and all inbred lines of pak choi and mustard were susceptible to all three pathotypes but their susceptibility was lower to pathotype 3 than to pathotypes 5 and 6.

scholarly journals Brassica crops and a Streptomyces sp as potential biocontrol for clubroot of brassicas

2001 ◽  
Vol 54 ◽  
pp. 80-83 ◽  
Author(s):  
L-H Cheah ◽  
G. Kent ◽  
S. Gowers
Keyword(s):  
Brassica Rapa ◽  
Chinese Cabbage ◽  
Field Trial ◽  
Plasmodiophora Brassicae ◽  
Soil Samples ◽  
Streptomyces Sp ◽  
Brassica Crops ◽  
Glasshouse Experiment

Two glasshouse experiments and a field trial were carried out to evaluate the potential of brassica crops which contain high levels of glucosinolates for control of clubroot of brassicas Brassica rapa crops were grown for about 70 days in a field which was infested with Plasmodiophora brassicae In the first glasshouse experiment the leaf and stem of the plants were harvested chopped into small pieces and mixed with clubrootinfested soil in punnets Chinese cabbage seedlings were then transplanted into the punnets In the second glasshouse experiment soil samples were taken in punnets from plots where the B rapa crops had been rotary hoed and left to decompose for about three weeks Chinese cabbage seedlings were transplanted into the punnets In both experiments B rapatreated soil reduced (P

scholarly journals Reaction of clubroot-resistant genotypes of Brassica rapa, Brassica napus and Brassica oleracea to Polish Plasmodiophora brassicae pathotypes in laboratory tests

2020 ◽  
Vol 158 (2) ◽  
pp. 533-544
Author(s):  
Agnieszka Czajka ◽  
Monika Markiewicz ◽  
Beata Kowalska ◽  
Urszula Smolińska
Keyword(s):  
Brassica Napus ◽  
Brassica Oleracea ◽  
Brassica Rapa ◽  
Plasmodiophora Brassicae ◽  
Root Hairs ◽  
Breeding Programmes ◽  
Macroscopic Observation ◽  
Resistant Genotypes

Abstract The Brassica genotypes selected for the experiments were previously found to be resistant to various Plasmodiophora brassicae pathotypes (Pb). Their interaction with pathotypes Pb2, Pb3 and Pb9 isolated in Poland was studied, using macroscopic observation for the presence of root galls, microscopic observations of P. brassicae plasmodia in the root hairs and quantitative PCR for determination of the pathogen’s quantity in plant roots and growing media. Of the Brassica genotypes studied, only B. rapa var. capitata line AABBcc was fully resistant to all the Polish pathotypes of P. brassicae. Some of the other “clubroot-resistant” genotypes tested were resistant to selected pathotypes, e.g. Brassica napus var. rapifera ‘Wilhelmsburger’ to Pb 2 and Pb3, Brassica oleracea var. capitata ‘Kilaton F1’ to Pb2 and Brassica rapa subsp. pekinensis ‘Bilko F1’ to Pb3, but were susceptible to others. B. oleracea var. capitata ‘Bindsachsener’, B. oleracea var. acephala subvar. lacinata ‘Verheul’ and B. napus var. napus ‘Mendel F1’ were moderately to highly susceptible to all Polish P. brassicae pathotypes. These results show that the classification of virulence of P. brassicae pathotypes selected in various areas differs significantly toward the same Brasssica genotypes and puts in question the practical value of pathotype classification determined with differential sets for farmers and plant breeders. Our results showed that B. rapa var. capitata AABBcc line, B. napus var. rapifera ‘Wilhelmsburger’, B. oleracea var. capitata ‘Kilaton F1’, B. rapa subsp. pekinensis ‘Bilko F1’ could be considered in Brassica breeding programmes as a source of resistance to Polish P. brassicae isolates.

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