in
Title : |
Evaluation of rice genotypes against bacterial leaf blight under field conditions |
Material Type: |
printed text |
Authors: |
Bedanand Chaudhary ; Nabin Kumar Dangal, Author ; Parbati Joshi, Author ; Ang Tenjing Sherpa, Author |
Pagination: |
313-318 p. |
Languages : |
English (eng) |
Keywords: |
Disease severity ; Xanthomonas oryzae pv. Genotype Resistant and Susceptible |
Abstract: |
Bacterial Leaf blight (BLB) of rice; caused by Xanthomonas oryzae pv. oryzae, is one of the most important diseases of rice in the eastern terai ofNepal. A field screening experiment was conducted to identify the resistance in rice to the disease during 2011 and 2012 wet season at Regional Agricultural Research Station, Tarahara. A total of 134 (OBN-71 , RA VTRL-26, RA VTN -21 , Quality-16) rice genotypes were evaluated for resistance in both the years. Each entry was planted in 2 rows of 2m length. Susceptible variety of rice (purple) was planted at an interval of every 10 entries. The pathogen was inoculated in all entries at 56 days after transplanting using Kauffmans clipping method. The disease was scored at 21 days after inoculation and continued for three scorings at 7 days interval using 0-9 scale. Severity of the disease varied significantly among the tested rice genotypes in both years. Level of disease severity was higher in most entries in 2012 than 2011 . Disease severity varied 11 to 100%. None of the genotypes were free from the disease. Out of 134 genotypes, 34 genotypes were moderately resistant to BLB disease during both the years which were IR09F 146, IR09F 166, IR09Fl72, IR09F174, IR09Fl89, IR09Fll3, IR09Fl17, IR09Fl43, IR09Fl47, IR09Fl58, IR09Fl77, IR09F229, CH-2, IR 80411-B-28-4, NR 1887-8-1-1-2, IR09Fl02, IR09F104, IR09F187, IR09Fl95, IR09Fl03, IR09F105, IR09F106, IR09FIIO, IR09Fl23, IR09Fl78, IR09F221 , IR09F226, IR09F283 , IR09F293, Sura vi, Sipi 5920-333 , Tarahara-1, Swarna and Swam a sub-1. Altogether 96 genotypes were moderately resistant during 2011 which decreased to 36 in 2012. Similarly, 16 genotypes were moderately susceptible during 2011 which increased to 55 in 2012. There were no highly susceptible genotypes during 2011 , but 32 genotypes became highly susceptible during 2012. Higher level of BLB disease was observed in 2012 than 2011. IR 78937-B-B-B-B-1, IR 79913-B-176-B-4, IR 80973-B-186- 41-2, IR 70210-39-CPA7-1-1-4-2 were moderately resistant in 2011 but became highly susceptible in 2012. BRRI Dhan-38, Mahima, IR70422-95-J-l , IR74052-95-3-3, Hardinath-2, BASMATI 10 I were moderately susceptible during 2011 but became highly susceptible during 2012. Similarly, IR 82635-B-B-47-2, Lalka basmati, IR 74371-54-1-1 , IR 86815-23-4- 1-2 and JH 15-1-1-1 were highly susceptible during 2012. Disease severity increased in second and third scoring in all entries. |
Link for e-copy: |
http://elibrary.narc.gov.np/?r=917 |
in
Evaluation of rice genotypes against bacterial leaf blight under field conditions [printed text] / Bedanand Chaudhary ; Nabin Kumar Dangal, Author ; Parbati Joshi, Author ; Ang Tenjing Sherpa, Author . - [s.d.] . - 313-318 p. Languages : English ( eng) Keywords: |
Disease severity ; Xanthomonas oryzae pv. Genotype Resistant and Susceptible |
Abstract: |
Bacterial Leaf blight (BLB) of rice; caused by Xanthomonas oryzae pv. oryzae, is one of the most important diseases of rice in the eastern terai ofNepal. A field screening experiment was conducted to identify the resistance in rice to the disease during 2011 and 2012 wet season at Regional Agricultural Research Station, Tarahara. A total of 134 (OBN-71 , RA VTRL-26, RA VTN -21 , Quality-16) rice genotypes were evaluated for resistance in both the years. Each entry was planted in 2 rows of 2m length. Susceptible variety of rice (purple) was planted at an interval of every 10 entries. The pathogen was inoculated in all entries at 56 days after transplanting using Kauffmans clipping method. The disease was scored at 21 days after inoculation and continued for three scorings at 7 days interval using 0-9 scale. Severity of the disease varied significantly among the tested rice genotypes in both years. Level of disease severity was higher in most entries in 2012 than 2011 . Disease severity varied 11 to 100%. None of the genotypes were free from the disease. Out of 134 genotypes, 34 genotypes were moderately resistant to BLB disease during both the years which were IR09F 146, IR09F 166, IR09Fl72, IR09F174, IR09Fl89, IR09Fll3, IR09Fl17, IR09Fl43, IR09Fl47, IR09Fl58, IR09Fl77, IR09F229, CH-2, IR 80411-B-28-4, NR 1887-8-1-1-2, IR09Fl02, IR09F104, IR09F187, IR09Fl95, IR09Fl03, IR09F105, IR09F106, IR09FIIO, IR09Fl23, IR09Fl78, IR09F221 , IR09F226, IR09F283 , IR09F293, Sura vi, Sipi 5920-333 , Tarahara-1, Swarna and Swam a sub-1. Altogether 96 genotypes were moderately resistant during 2011 which decreased to 36 in 2012. Similarly, 16 genotypes were moderately susceptible during 2011 which increased to 55 in 2012. There were no highly susceptible genotypes during 2011 , but 32 genotypes became highly susceptible during 2012. Higher level of BLB disease was observed in 2012 than 2011. IR 78937-B-B-B-B-1, IR 79913-B-176-B-4, IR 80973-B-186- 41-2, IR 70210-39-CPA7-1-1-4-2 were moderately resistant in 2011 but became highly susceptible in 2012. BRRI Dhan-38, Mahima, IR70422-95-J-l , IR74052-95-3-3, Hardinath-2, BASMATI 10 I were moderately susceptible during 2011 but became highly susceptible during 2012. Similarly, IR 82635-B-B-47-2, Lalka basmati, IR 74371-54-1-1 , IR 86815-23-4- 1-2 and JH 15-1-1-1 were highly susceptible during 2012. Disease severity increased in second and third scoring in all entries. |
Link for e-copy: |
http://elibrary.narc.gov.np/?r=917 |
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