Evaluation of rice genotypes for resistance to blast disease / B. Chaudhary    

Public ISBD in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.     Title : Evaluation of rice genotypes for resistance to blast disease Material Type: printed text Authors: B. Chaudhary ; M Yadav, Author ; Yadaw, R.B., Author ; Chaudhary, D.K., Author ; PCP Chaurasiya, Author ; Chaudhary, R.N., Author ; B.N Mahato, Author ; Sah, D.N., Author Pagination: 327-335 p. Languages : English (eng) Keywords: Blast  fungus  ;  rice  genotypes  sources  of  resistance  pathogen  variability Abstract: exotic were evaluated for resistance to blast over four locations during 2002 and 2003, respectively. Disease severity varied over locations and years. Within locations, genotypes showed variation in disease severity. During 2002, 186 entries were resistant (R), 40 moderately resistant (MR.), 14 moderately susceptible {MS), 32 susceptible (S) to disease at Hardinath. At Lumle, 69 entries scored R, 75 MR, 66 MS and 62 S to the disease. At Rampur, 174 entries rated R, 19 MR and 3 MS to the disease while 78 failed to germinate. At Tarahara, 236 entries showed R, 6 MR and 30 entries did nopt germinate. During 2003, 148 entries showed R, 16 MR, 4 MS and 20 S to the disease at Hardinath. At Tarahara, all the tested entries were resistant to disease, indicating escape from disease during the growing season. At Khumaltar, 169 entries scored R, 59 MR, 29 MS and 8 S to disease. At Nawalpur, 217 entries rated R, 21 MR, 9 MS and 11 S to the disease. However, 39 and 123 lines were resistant to the pathogen over locations during 2002 and 2003 tests, respectively. This indicated that the genotypes varied for disease reaction over locations suggesting the prevalence of variable virulence in the pathogen population. In neck blast screening, 11 genotypes out of 274 entries showed R to MR to the disease over Hardinath and Rampur during 2002 test. In 2003, 132 genotypes were R to MR to the disease at Hardinath. Blast nursery also included 166 entries received from International Rice Research Institute in 2002. Of them, 60 entries were found resistant to the disease over Hardinath and Rampur. Link for e-copy: http://elibrary.narc.gov.np/?r=1119 in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.     Evaluation of rice genotypes for resistance to blast disease [printed text] / B. Chaudhary ; M Yadav, Author ; Yadaw, R.B., Author ; Chaudhary, D.K., Author ; PCP Chaurasiya, Author ; Chaudhary, R.N., Author ; B.N Mahato, Author ; Sah, D.N., Author . - [s.d.] . - 327-335 p. Languages : English (eng) Keywords: Blast  fungus  ;  rice  genotypes  sources  of  resistance  pathogen  variability Abstract: exotic were evaluated for resistance to blast over four locations during 2002 and 2003, respectively. Disease severity varied over locations and years. Within locations, genotypes showed variation in disease severity. During 2002, 186 entries were resistant (R), 40 moderately resistant (MR.), 14 moderately susceptible {MS), 32 susceptible (S) to disease at Hardinath. At Lumle, 69 entries scored R, 75 MR, 66 MS and 62 S to the disease. At Rampur, 174 entries rated R, 19 MR and 3 MS to the disease while 78 failed to germinate. At Tarahara, 236 entries showed R, 6 MR and 30 entries did nopt germinate. During 2003, 148 entries showed R, 16 MR, 4 MS and 20 S to the disease at Hardinath. At Tarahara, all the tested entries were resistant to disease, indicating escape from disease during the growing season. At Khumaltar, 169 entries scored R, 59 MR, 29 MS and 8 S to disease. At Nawalpur, 217 entries rated R, 21 MR, 9 MS and 11 S to the disease. However, 39 and 123 lines were resistant to the pathogen over locations during 2002 and 2003 tests, respectively. This indicated that the genotypes varied for disease reaction over locations suggesting the prevalence of variable virulence in the pathogen population. In neck blast screening, 11 genotypes out of 274 entries showed R to MR to the disease over Hardinath and Rampur during 2002 test. In 2003, 132 genotypes were R to MR to the disease at Hardinath. Blast nursery also included 166 entries received from International Rice Research Institute in 2002. Of them, 60 entries were found resistant to the disease over Hardinath and Rampur. Link for e-copy: http://elibrary.narc.gov.np/?r=1119

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