Evaluation of improved genotypes of mulberry through leaf chemical analysis and bioassay with silkworm race NB4D2 | Evaluation de génotypes de mûriers améliorés par l'analyse chimique de la feuille et évaluation biologique avec la variété de ver à soie NB4D2
2001
Patil, S.V. ((Karnataka State Sericulture Research and Development Institute, Bangalore (Inde))) | Mallikarjunappa, R.S. | Dandin, S.B. | Eswara Rao, M.S.
Six improved mulberry genotypes S36, Viswa, SI, S1635, S799 and M5 are grown at the main campus of the KSSRDI, Bangalore. Moulting and rearing parameters observed from six trials show significant differences among the genotypes at 1 / probability level. Silkworm race NB4D2 of Bombyx mori larvae fed on the leaves of S36, SI and S1635 genotypes showed significantly higher larval weight and moulting ratio both during first and second instar than larvae fed on M5 genotype. Of the six mulberry genotypes, S1635 performed better in four rearing parameters out of seven. The correlation coefficients between the nutritional components of mulberry leaves and moulting ratio show that higher leaf water content (LWC), leaf water retention (LWR), total chlorophyll, total soluble sugars, soluble proteins and total nitrogen contents will be required considerably more for first instar larvae, compared to the second instar larvae. Also, higher levels of LWC total soluble sugars, soluble proteins, total chlorophyll and LWR resulted in decreased larval duration and increased larval weight, effective rate of rearing (ERR) by weight, cocoon weight, shell weight and shell ratio. This information can be utilised effectively in breeding programs to develop desirable mulberry genotypes
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