Identification of Seven Primary Trisomics of Jute*

With a view to isolating and identifying primary trisomics of Corchorus olitorius the progenies of autotriploid were examined chromosomally. The progenies of selfed triploids, crosses of triploids with diploid and diploid with triploids were rich source of all the seven possible primary trisomics. Maximum frequency of trisomies was observed in selfed progeny. Amongst different trisomies, trisomic 3 was the least frequent while trisomic 4 and 5 were the most frequent in these progenies. All other trisomies occurred in intermediate frequencies. All the seven possible primary trisomies were identified chromosomally and morphologically. They were found to have distinct identifying morphological characteristics by which they could be distinguished from their diploid sibs as well as amongst themselves. Leaf morphology appeared to be the most useful character for identification of trisomies correctly.