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Karyotype Analysis of Tuber Mustard (Brassica juncea Var. Tumida Tsen & Lee) in China


Karyotype Analysis of Tuber Mustard (Brassica juncea Var. Tumida Tsen & Lee) in China



International Journal of Agriculture and Biology 13(5): 737-740



ISSN/ISBN: 1560-8530

Tuber mustard (Brassica juncea var. tumida Tsen & Lee), a variation in the species B. juncea belonging to the Cruciferae family, is an agriculturally and economically important crop cultivated along the Yangtze River in China. In this study the karyotypic characteristics of tuber mustard has been investigated by examining metaphase chromosome spreads obtained from root tip. The results showed that the karyotype formula of tuber mustard was 2n=2x=36=18 m (2SAT)+12sm+6st. The total haploid length of the species was 27.85 mu m. The chromosome lengths ranged from 1.47 mu m to 2.10 mu m with an average of 1.73. The relative lengths of chromosomes ranged from 5.28 to 7.54. The ratio between the longest chromosome and the shortest chromosome was 1.43. The arm ratio ranged from 1.12 to 4.21. The karyotypic asymmetry of tuber mustard was 70.10%, of which belonged to "2A". We can differentiate tuber mustard and the other species in brassica juncea by their karyotype characteristics. These results may help to carry out germplasm protection, research and improving tuber mustard in future. Friends Science Publishers

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Accession: 070661487

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