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ABSTRACT
In this study 5 diploid female parents namely, S799, Sl, K^sub 2^ M. India HP, and China W hite were crossed with five tetrapolid male obtained through colchicine treatment of F1 seeding of Morus Indica HP madalays (T8) M. indica HP x Phillipine (T30) and China W hite x S799 x S799 (T31, T31, T33). Crosses were made in the month of January. The results indicated pollenviability of 78.1 - 84.2 %, the length of sorasis varied from 1.6 - 3.1 and breadth 0.4 - 1.3 cm. The weight of sorasis ranged from 0.5 to 1.8 mg.
Key words : Diploid, Colchicine, China W hite, Cross.
INTRODUCTION
Leaf Quality of mulberry leaf is the chief parameter for production of high luxurious quality silk. Higher quantity of good foliager is essential for economic silkworm rearing. Triploid varieties mulberry having higher protein sugars, minerals and moisture. Seki and Oshikane (1959) reported triploid is superior to diploids in nutritive value by feeding triploid leaves to silkworm. Hamada (1963) reported tukroid gave greater nutritive qualities of leaves for silkworm and are much resistant to coldness and blight diseases. Abdullaev (1962) reported that triploid varieties were more productive of leaves than the diploid and tetraploid forms. Mustfaev (1970) opined that triploids give higher leaf yield than the standard variety Shikhges.Triploid forms of mulberry leaves were also accounted for increase viability of the silkworm by 1 to 4.2% and reduced rearing period by 1 to 1.5 days (Musfafaev 1968). Das et al (1974) reported lesser leaf consumption, when triploid leaves were used for silkworm feeding. Therefore, it is quite obvious to give more emphasis to evolve triploid through polyploid breeding, In this study attempts were made to study the crossability...