Abstract
Thirty two jute (Corchorus olitorius and C. capsularis) varieties, including 25 released/notified and seven of common knowledge, were characterized through distinctness, uniformity and stability (DUS) testing trials for two consecutiveyears using 17 heritable morphological traits prescribed in the Revised Official DUS Test Guidelines of Jute to enableidentification of these varieties and for unambiguous ascertainment of distinctness. Out of 17 traits, 8 were found to be monomorphic, 7 dimorphic and only 2 polymorphic in C. capsularis, while 8 traits were dimorphic and 9 polymorphicamong C. olitorius varieties, indicating their potential for varietal characterization. On the basis of this study no singlecharacter could identify all the varieties individually; however, when used in combination, identity and distinctness of almost all the C. olitorius varieties and 10 varieties of C. capsularis (Padma, JRC-212, Bidhan Pat-2, D-154, KTC-1, KC-1, JRC-80, Bidhan Pat-3, JRC-7447 and JRC-698) could be established individually. The remaining varieties of C. capsularis could be classified into two groups: early flowering group (JRC-321, UPC-94) and fine fibre group (JRC-4444, Bidhan Pat-1). Hence, morphological characters alone may not suffice for DUS testing of C. capsularis varieties. All the varieties of both species released in India so far albeit professed their uniformity and stability through morphological characterization, but use of biochemical and/or molecular markers along with search for other morphological traits need to be explored for the delineation of C. capsularis varieties.
Highlights
Cultivars are def ined by the International Convention for the Protection of New Varieties of Plants (UPOV, 1991)
A descriptor is a characteristic that refers to the form, structure or behaviour of an accession in a germplasm collection
A total of 25 varieties of both species (Corchorus olitorius L. and C. capsularis L.) of jute released or notified in India and 7 varieties of common knowledge were studied for 17 morphological characters
Summary
Cultivars are def ined by the International Convention for the Protection of New Varieties of Plants (UPOV, 1991). Differentiation and protection of varieties specific descriptors are used in each species. A descriptor is a characteristic that refers to the form, structure or behaviour of an accession in a germplasm collection. Descriptors must satisfy with three technical requisites of distinctness (D), uniformity (U) and stability (S) (UPOV, 2002). Distinctness is the capability of a descriptor that demonstrates clear differences in inter-varietal variation. Uniformity is the intra-varietal homogeneity, and stability is the absence of temporal or spatial variation. DUS testing of cultivars is one of the requirements for granting Plant. Pureline selection from an indigenous germplasm JRO-3690. Selection from tobacco leaf × long internode
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