STUDY ON HETEROSIS MANIFESTATION AND TYPE OF INFERITANCE IN F1 OF SOME FRESH COCOON TECHNOLOGICAL CHARACTERS IN SEX LIMITED FOR LARVAL MARKINGS SILKWORM BOMBYX MORI L. BREEDS AND HYBRIDS
Diana Arkova-Pantaleeva, Jolanta Vasileva, Panomir Tzenov
Abstract: During the period 2007 - 2011, at the Sericulture and Agriculture Experiment Station (SAES), Vratsa a study was conducted of silkworm hybrids, obtained from four sex-limited for larval markings breeds, /Vratsa 2003, Vratsa 2006, Vratsa 2007 and Vratsa 2012 and two ordinary breeds - Vratsa 54 and Vratsa 55.
It was found out that the highest fresh cocoon weight and shell weight performed the hybrids Vratsa 2007 x Vratsa 2012 and the reciprocal cross and Vratsa 2006 x Vratsa 55. The hybrid Vratsa 2007 x Vratsa 2012 and the reciprocal cross are characterized with comparatively very high silk shell percentage - over 23%. There have been detected high heterosis expressions for the mid-parental value /MP/ as for the fresh cocoon weight and shell weight in the F1 hybrids, having as parents sex-limited for larval markings breeds. The inheritance in F1 of fresh cocoon weight and shell weight characters is in the type of positive overdominance.
It was found out that the highest fresh cocoon weight and shell weight performed the hybrids Vratsa 2007 x Vratsa 2012 and the reciprocal cross and Vratsa 2006 x Vratsa 55. The hybrid Vratsa 2007 x Vratsa 2012 and the reciprocal cross are characterized with comparatively very high silk shell percentage - over 23%. There have been detected high heterosis expressions for the mid-parental value /MP/ as for the fresh cocoon weight and shell weight in the F1 hybrids, having as parents sex-limited for larval markings breeds. The inheritance in F1 of fresh cocoon weight and shell weight characters is in the type of positive overdominance.
Keywords: heterosis.; hybrids; sex-limited breeds; silkworm; technological characters
Date published: 2023-02-01
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