Effect of wild abortive (WA) cytoplasm on disease and insect resistance in rice
2001
Faiz, F.A. | Virmani, S.S. (International Rice Research Inst., Los Banos, Laguna 4031 (Philippines). Plant Breeding, Genetics and Bioochemistry Div.) Ali, A.J.
The study revealed that for rice blast, two of three CMS lines viz. IR 703721 and IR58025A showed similar reaction to their corresponding maintainer (B) lines. Similarly mean score and reaction of A/R and B/R crosses against two races of rice blast fungus were identical. In case of IR682801 and IR68280 B also no difference in mean reaction was observed between CMS and maintainers and their A/R and B/R crosses, however IR682801 and IR68280 B A/R and B/R crosses were found equally and highly resistant to rice blast race P06-6 and BN111 suggesting no negative influence of WA cytoplasm on resistance to rice blast fungus. The CMS lines, IR70372 A, IR58025 A and IR68280 A and their maintainers did not show differences to BB reaction against six races. Likewise F1's of A/R and B/R crosses also did not show difference in the mean reaction. The results revealed that WA cytoplasm has no association with susceptibility to these two major diseases. IR68280 A showed significantly better score for BPH [brown planthopper] resistance than its maintainer line and likewise the F1's of A/R crosses also indicated better score than the F1's of their corresponding B/R crosses. IR72788 A, similarly, the mean difference between A and B and A/R and B/R crosses were not significant. For WBPH [whitebacked planthopper], the CMS lines IR70372 A and IR58025 A and their maintainer (B), IR70372 B and IR58025 B indicated non-significant differences in mean score, whereas the differences in mean scores between F1's of A/R and B/R crosses of IR58025 A and IR58025 B were significant and non-significant between F1's A/R and B/R crosses of IR70372 A and IR70372 B. The study revealed that WA cytoplasm was not associated with resistance/susceptibility to BPH and WBPH
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