Evaluation and Identification of Superior Polyvoltine Crossbreeds of Mulberry Silkworm, Bombyx mori L.

Ramesha, C.; Seshagiri, S. V.; Rao, C. G. P.

doi:10.3923/je.2009.179.188

Cited by 18 publications

(6 citation statements)

References 8 publications

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“…The isolated hemocytes of polyvoltine breeds exhibited the induction of 70 kDa protein ( Joy and Gopinathan 1995 ). For instance, polyvoltine breeds reared in tropical countries are known to tolerate slightly higher temperature, as are cross breeds that have evolved for a tropical climate ( Ramesha et al 2009 ).…”

Section: Discussionmentioning

confidence: 99%

“…However, hybrid quality is low when compared to the existing international standards. For example, cross breeds of polyvoltine female × bivoltine male are generally reared in these regions during the summer, but the quality of cocoon production is not as high as it is for bivoltine silkworm hybrids ( Ramesha et al 2009 ). Bivoltine silkworm breeds are known for their qualitative and quantitative traits in the sericulture industry.…”

Section: Introductionmentioning

confidence: 99%

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Screening Strains of the Mulberry Silkworm,Bombyx mori, for Thermotolerance

Kumari

Subbarao

Misra

et al. 2011

Journal of Insect Science

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A tropical climate prevails in most of the sericultural areas in India, where temperature increases during the summer lead to adverse effects on temperate bivoltine silkworm rearing and cause crop losses. Screening for thermotolerance in the silkworm, Bombyxmori L. (Lepidoptera: Bombycidae) is an essential prerequisite for the development of thermotolerant breeds/hybrids. In the current study, the aim was to identify potential bivoltine silkworm strains specific for tolerance to high temperature. The third day of fifth stage silkworm larvae of bivoltine strains were subjected to high temperature of 36 ± 1° C with RH of 50 ± 5 % for six hours (10:00–16:00) every day until spinning for three consecutive generations. Highly significant differences were found among all genetic traits of bivoltine silkworm strains in the treated groups. Three groups of silkworm resulted including susceptible, moderately tolerant, and tolerant by utilizing pupation rate or survival rate with thermal stress as the index for thermotolerance. Furthermore, based on the overall silkworm rearing performance of nine quantitative genetic traits such as larval weight, cocoon yield by number and weight, pupation, single cocoon and shell weight, shell ratio, filament length and denier, three bivoltine silkworm strains, BD2-S, SOF-BR and BO2 were developed as having the potential for thermotolerance. The data from the present study enhance knowledge for the development of thermo tolerant silkworm breeds/ hybrids and their effective commercial utilization in the sericulture industry.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Screening Strains of the Mulberry Silkworm,Bombyx mori, for Thermotolerance

Kumari

Subbarao

Misra

et al. 2011

Journal of Insect Science

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“…The existing situation provides scope for creating polyvoltine × bivoltine hybrids (crossbreeds) as a commercial venture as hybrids above 90% of total silk production (Ramesha et al 2009a). …”

Section: Introductionmentioning

confidence: 99%

“…Sericulture in India is practiced predominantly in tropical environmental regions such as Karnataka, Andhra Pradesh, Tamil Nadu, West Bengal, and to a limited extent in the temperate environment of Jammu and Kashmir. The existing situation provides scope for creating polyvoltine × bivoltine hybrids (crossbreeds) as a commercial venture as hybrids above 90% of total silk production ( Ramesha et al 2009a ).…”

Section: Introductionmentioning

confidence: 99%

Nutrigenetic Screening Strains of the Mulberry Silkworm,Bombyx mori, for Nutritional Efficiency

Ramesha

Lakshmi

Kumari

et al. 2012

Journal of Insect Science

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The activity of sericulture is declining due the reduction of mulberry production area in sericulture practicing countries lead to adverse effects on silkworm rearing and cocoon production. Screening for nutrigenetic traits in silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) is an essential prerequisite for better understanding and development of nutritionally efficient breeds/hybrids, which show less food consumption with higher efficiency conversion. The aim of this study was to identify nutritionally efficient polyvoltine silkworm strains using the germplasm breeds RMW2, RMW3, RMW4, RMG3, RMG1, RMG4, RMG5, RMG6 and APM1 as the control. The 1st day of 5th stage silkworm larvae of polyvoltine strains were subjected to standard gravimetric analysis until spinning for three consecutive generations covering 3 different seasons on 19 nutrigenetic traits. Highly significant (p ≤ 0.001) differences were found among all nutrigenetic traits of polyvoltine silkworm strains in the experimental groups. The nutritionally efficient polvoltine silkworm strains were resulted by utilizing nutrition consumption index and efficiency of conversion of ingesta/cocoon traits as the index. Higher nutritional efficiency conversions were found in the polyvoltine silkworm strains on efficiency of conversion of ingesta to cocoon and shell than control. Comparatively smaller consumption index, respiration, metabolic rate with superior relative growth rate, and quantum of food ingesta and digesta requisite per gram of cocoon and shell were found; the lowest amount was in new polyvoltine strains compared to the control. Furthermore, based on the overall nutrigenetic traits utilized as index or ‘biomarkers’, three polyvoltine silkworm strains (RMG4, RMW2, and RMW3) were identified as having the potential for nutrition efficiency conversion. The data from the present study advances our knowledge for the development of nutritionally efficient silkworm breeds/hybrids and their effective commercial utilization in the sericulture industry.

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“…Sericulture activities are applied from temperate and subtropical to tropical areas. Mulberry cultivation is suitable for this region to produce mulberry leaves, which is the sole food of the silkworms Ghazy, 2005 &Ramesha et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Regional Effect, Evaluation Index and Subordinate Function of Mulberry Silkworm in Some Egyptian Governorates

Fouad

2020

Egyptian Academic Journal of Biological Sciences. A, Entomology

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Evaluation and Identification of Superior Polyvoltine Crossbreeds of Mulberry Silkworm, Bombyx mori L.

Cited by 18 publications

References 8 publications

Screening Strains of the Mulberry Silkworm,Bombyx mori, for Thermotolerance

Screening Strains of the Mulberry Silkworm,Bombyx mori, for Thermotolerance

Nutrigenetic Screening Strains of the Mulberry Silkworm,Bombyx mori, for Nutritional Efficiency

Estimation of Regional Effect, Evaluation Index and Subordinate Function of Mulberry Silkworm in Some Egyptian Governorates

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