Asian Journal of Bio Science

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

Silkworm Breeds and Their Hybrids of Bombyx mori L. to bmnpv Stress


Affiliations
1 Department of Sericulture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), India
     

   Subscribe/Renew Journal


BmNPV (Bombyx mori nuclear polyhedrosis virus) causes nuclear polyhedrosis in silkworms. This paper reports on the relative susceptibility of silkworm pure breeds and their hybrids reared under BmNPV stress condition. Infection during fourth and fifth instar silkworm Bombyx mori L., with nuclear polyhedrosis virus caused reduction in larval weight and revealed significant results. However, maximum larval weight of 3.67 and 3.98g/10 was noticed in fourth instar inoculated batches (10-1 and 10-3) of CSR2. Among hybrids, CSR4xCSR16 and CSR2xCSR4 have recorded (5.34 and 5.35 g/10) and (4.77 and 5.47g/10) compared to other hybrids. On the other hand, fourth instar inoculated batches of fifth instar also recorded maximum larval weight in CSR2 (13.88 and 14.18g/10 and 11.68 and 11.74g/10). Further among hybrids of same instar inoculated, CSR4xCSR16 recorded (19.06 and 19.90g/10 and 20.21 and 21.63g/10) which was found maximum than other hybrids. Effective rate of rearing (ERR) of fourth instar inoculated batches were realized differently due to the administration of BmNPV. However, the maximum ERR (59.33 and 64.00%) and (62.00 and 62.00%) was recorded in PM which exhibited more survival percentage followed by CSR4(58.67 and 56.00%) and (58.67 and 59.33%) compare to other two breeds. Among hybrids, PMxCSR4 was recorded highest ERR (60.67 and 58.00%) and (58.67 and 57.33%) when administered with 10-1 and 10-3, respectively. The same trend has been noticed even in control lots. The results clearly indicated that, bivoltine breeds and their hybrids reflected low ERR percentage values inturn more sensitive to BmNPV stress.

Keywords

Larval Weight, ERR, BmNPV, Silkworm Breeds
Subscription Login to verify subscription
User
Notifications
Font Size


  • Anonymous (1976). FAO Agricultural Services Bulletin, Manual of Sericulture, FAO of the United Nations, ROME.

  • Aratake, Y. (1973). Differences of the resistance of infectious flacherie virus between strains of silkworm, Bombyx mori L. J. Seric. Sci. Jpn., 42: 230-238.

  • Bhaskar, R.N., Govindan, R. and Devaiah, M.C. (1989). Sensitiveness of some breeds of silkworm bombyx mori L. to kenchu virus disease on larval weight reduction. Sericologia, 29(1): 127-131.

  • Biabani, M.R., Seydavi, A.R., Gholami, M.R., Etebari, K. and Matindoost L. (2005). Evaluation of resistance to nuclear polyhedrosis virus in commercial hybrids of silkworm (Bombyx mori). Formosan Entomol., 25: 103-112.

  • Biabani, M.R., Mirhoseini, S.Z., Etebari, K. and Matindoost, L. (2005). The effects of nuclear polyhedrosis virus infection in 9 commercial hybrids of silkworm (Bombyx mori L.) XXth Congress of the International Sericultural Commission, Bangalore (KARNATAKA) INDIA.

  • Chen, K.Q.,Yao, Y.,Wang and Cheng, J. (2003). Genetic basis of screening of molecular markers for nuclear polyhedrosis virus resistance, Bombyx mori L, Internat. J. Indust. Entomol., 7 : 5-10.

  • Chitra, C., Karanth, N.G. and Vasantharajan, V.N. (1975). Diseases of mulberry silkworm, Bombyx mori L. J. Sci. Ind. Res., 34 (1): 386-401.

  • Dandin, S.B., Jayaswal, J. and Giridhar, K.R. (2003). Handbook of sericulture techonologies. Central Silk Board, Bangalore, 289pp.

  • Furuta, Y. (1995). Susceptibilty of the races of the silkworm, preserved in NISES to nuclear polyhedrosis virus and desonucleosis viruses, Bull., Natl., Inst. Seric. & Entomol. Sci., 10 : 119-145.

  • Jaiswal, K., Goel, R.R. and Chauhan, S.S. (2004). Studies on relative susceptibility of different breeds of silkworm to diseases under natural condition at Lucknow. Progress of research on disease and pest management in sericulture. Sericulture College, Chintamani, pp. 108-111.

  • Khurad, A.M., Mahulikar, A., Rathod, M.K., Rai, M.M., Kanginakudru, S. and Nagaraju, J. (2004). Vertical transmission of nucleopolyhedro virus in the silkworm. Bombyx mori L. J. Inver. Phatol., 87: 8-15.

  • Narayanaswamy, T.K., Shyamala, M.B. and Govindan, R. (1985). Reaction of different breeds of silkworm, Bombyx mori L. to kenchu virus. Indian J. Seric., 24(2): 66-67.

  • Nataraju, B., Datta R.K., Baig, M., Balavenkatasubbaiah, M., Samson M.V. and Sivaprasad, V. (1998). Studies on the prevalence of nuclear polyhedrosis in sericultural areas of Karnataka. Indian J. Seric., 37(2): 154-158.

  • Selvakumar, T., Nataraju, B., Balaventasubbaiah, M., Sivaprasad, V., Baig, M., Virendrakumar, S.D. Sharma, N. Thiagarajan and Datta, R.K. (2002). A report on the prevalence of silkworm diseases and estimated crop loss, Proceedings of National Conference on Strategies for Sericulture Research and Development. November, 16-18, 2000, (ed S.B. Dandin and V.P Gupta), CSR&TI., Mysore (KARNATAKA) INDIA.

  • Sharma, S.D., Chandrasekharan, K., Singh, Ravindra, Rao, d. Raghavendra, Nataraju, B., Palit, A.K. and Dandin, S.B. (2007). Relative tolerance of certain polyvoltine silkworm breeds of Bombyx mori L. to nuclear polyhedrosis virus and development of BmNPV tolerant foundation crosses. Sericologia, 47(4): 405-413.

  • Singh, B.D., Baig, M., Balavenkatasubbaiah, M., Sharma, S.D., Sengupta, K. and Reddy, N.S. (2003). Studies on relative susceptibility of different breeds of silkworm, Bombyx mori L., To diseases under natural conditions, Indian J. Seric., 29 : 142-144.

  • Sivaprasad, V.C., Chandrasekharaiah, C., Misra, S., Kumar, K.P.K. and Rao, Y.U.M. (2003). Screening of silkworm breeds for tolerance to Bombyx mori nuclear polyhedrosis virus (BmNPV) Internat. J. Indust. Entomol., 7: 87-91.

  • Sowmyashree, T.S. and Nataraju, B. (2007). Identification of silkworm breeds resistant to nuclear polyhedrosis through BmNPV inoculation and induction. Indian J. Seric., 46(1): 32-37.

  • Usha, C.D. (1996). Instar and breed susceptibility of silkworm Bombyx mori L. to BmNPV and genetic control of susceptibility. M.Sc. (Seri.) Thesis, University of Agricultural Sciences, Bangalore, KARNATAKA (INDIA).


Abstract Views: 477

PDF Views: 0




  • Silkworm Breeds and Their Hybrids of Bombyx mori L. to bmnpv Stress

Abstract Views: 477  |  PDF Views: 0

Authors

M. H. Asha
Department of Sericulture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), India
R. N. Bhaskar
Department of Sericulture, University of Agricultural Sciences, G.K.V.K., Bengaluru (Karnataka), India

Abstract


BmNPV (Bombyx mori nuclear polyhedrosis virus) causes nuclear polyhedrosis in silkworms. This paper reports on the relative susceptibility of silkworm pure breeds and their hybrids reared under BmNPV stress condition. Infection during fourth and fifth instar silkworm Bombyx mori L., with nuclear polyhedrosis virus caused reduction in larval weight and revealed significant results. However, maximum larval weight of 3.67 and 3.98g/10 was noticed in fourth instar inoculated batches (10-1 and 10-3) of CSR2. Among hybrids, CSR4xCSR16 and CSR2xCSR4 have recorded (5.34 and 5.35 g/10) and (4.77 and 5.47g/10) compared to other hybrids. On the other hand, fourth instar inoculated batches of fifth instar also recorded maximum larval weight in CSR2 (13.88 and 14.18g/10 and 11.68 and 11.74g/10). Further among hybrids of same instar inoculated, CSR4xCSR16 recorded (19.06 and 19.90g/10 and 20.21 and 21.63g/10) which was found maximum than other hybrids. Effective rate of rearing (ERR) of fourth instar inoculated batches were realized differently due to the administration of BmNPV. However, the maximum ERR (59.33 and 64.00%) and (62.00 and 62.00%) was recorded in PM which exhibited more survival percentage followed by CSR4(58.67 and 56.00%) and (58.67 and 59.33%) compare to other two breeds. Among hybrids, PMxCSR4 was recorded highest ERR (60.67 and 58.00%) and (58.67 and 57.33%) when administered with 10-1 and 10-3, respectively. The same trend has been noticed even in control lots. The results clearly indicated that, bivoltine breeds and their hybrids reflected low ERR percentage values inturn more sensitive to BmNPV stress.

Keywords


Larval Weight, ERR, BmNPV, Silkworm Breeds

References