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Stable resistance to bacterial blight disease in rice
Author(s) -
NAYAK P.,
CHAKRABARTI N. K.
Publication year - 1986
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1986.tb03197.x
Subject(s) - cultivar , biology , xanthomonas campestris , bacterial blight , blight , xanthomonas oryzae , incidence (geometry) , plant disease resistance , horticulture , oryza sativa , pathogenicity , bacterial disease , linear regression , veterinary medicine , agronomy , bacteria , microbiology and biotechnology , pathogen , mathematics , genetics , gene , medicine , geometry , statistics
SUMMARY Ten rice cultivars were evaluated for stable resistance to 18 isolates of Xanthomonas campestris pv. oryzae. Stable performance of the host cultivar was evaluated by regressing the cultivar means on the mean level of pathogenicity of the isolates averaged over all cultivars. A cultivar with low disease incidence, a regression coefficient near or equal to zero (b = 0) and the deviation from regression as small as possible (S 2 d = 0) was considered highly stable while that with low disease incidence, b = 1 ‐0 and S 2 d = 0 was considered to possess average stability. Accordingly, cvs TKM‐6, CB II, DV 85 and Ramakrishna were considered to possess average stability while IR 20 and Indira were the most stable. Cvs Cemposelak, IR 1545, BJ 1 and IR 8 showed high response to disease incidence with relatively small changes in level of pathogenicity of the isolates and hence were considered most unstable. The regression technique was considered as a valuable tool for identification of stable resistance to bacterial blight disease of rice.