Vol. 6, Issue 5 (2017)
Heterosis studies on thermotolerant hybrids of bivoltine silkworm (Bombyx mori L.)
Author(s): Mokshe Sajgotra, RK Bali and Ravinder Sharma
Abstract: The investigation was carried out to evaluate the twenty-eight silkworm bivoltine hybrids raised by involving half (8 × 8) diallel set of bivoltine breeds in order to identify the thermotolerant, adaptable, high yielding hybrids suited for sub-tropical climate. The evaluation of hybrids was done on heterosis worked at mid parent value. Maximum heterosis was depicted by non-breakable filament length (37.75) followed by filament length (35.62), cocoon yield (by weight) (35.22), larval weight (28.21), single shell weight (24.46) and cocoon weight (17.10). On the basis of significant heterosis displayed for thirteen important commercial parameters, four hybrid combinations ND5 × PO1 (Cumulative heterosis 362.83), ND5 × PO3 (Cumulative heterosis 323.17), PO1 × Udhey-6 (Cumulative heterosis 291.31) and PO1 × Udhey-3 (Cumulative heterosis 250.42) were identified to be heterotic. The superiority of these hybrids was further confirmed by Evaluation Index (E.I.) method. Hybrid ND5 × PO3 (E.I. 55.61) ranked 1st followed by ND5 × PO1 (E.I. 54.40) and PO1 × Udhey-6 (E.I. 51.97). The control hybrid (SH6 × NB4D2) scored the cumulative heterosis value of 155.36 and the average E.I. value of 39.17 only.
How to cite this article:
Mokshe Sajgotra, RK Bali and Ravinder Sharma. Heterosis studies on thermotolerant hybrids of bivoltine silkworm (Bombyx mori L.). Journal of Pharmacognosy and Phytochemistry. 2017; 6(5): 921-928.