Studies Of Kenaf's (Hibiscus Cannabinus L.) Genetic Diversity And Its Morphological And Cytological Classification

With the increase of kenaf(Hibiscuc cannabinus L. )germplasm' s quantity and genetic diversity, the accessions collected must be tidied and appraised. 15 kenaf cultivars, 10 wild kenaf and 5 kenaf sibling species are conducted to morphological classification.8 main descriptors based on "the descriptors and data standard for kenaf" are selected and arrayed to classify kenaf germplasm. 7 of these cultivars and 8 of wild kenaf are conducted to karyotype analysis. Genetic difference and evolution progress are studied by observing and measuring the size and shapes of chromosomes, karyotypes and drawing chromosomal idiograms. The results show that:1. All the 30 kenaf accessions are annual herbal plants, there are significant morphological differences in leaves, stems, flowers, fruits and seeds. Kenaf are classified into 3 types namely acuminate type, obtuse type and forked type judging from the shape of bract top. The type is classified into 2 sub-types namely lobed leaf and unlobed leaf sub-types judging from the leaf shape. All the unlobed leaf sub-type are cultivars , contains 2 green stem accessions,1 red stem and 1 purple stem accession respectively. The lobed leaf sub-type has very abundant genetic diversity, which contains 5 green stem accessions, 16 red stem accessions and 1 purple stem accession.2. Relations have been analyzed elementarily based on morphological differences. Cultivars 7804 and 722 are near genetic relations while Cuba -8 and Alain kenaf are further relations in the unlobed leaf sub-type; Qingpi-3, Minhong362 and IDN147 are intimate, Yuanjiang kenaf, GA42, SL254, ZB324 and UG93 are in another intimate group, the two groups is further relations from other materials. Menghai Zijing is considered to be a half-wild kenaf. 85-283 is the farthest relation from other materials, maybe not belong to Hibiscus.