Cytogenetical studies in Sesamum. I. Cytology of the parents, Sesamum orientale Linn. and Sesamum prostratum Retz., and the cytology of the sterile hybrid between them and the fertile amphidiploid

Raghavan, T.S.; Krishnamurthy, K.V.

Indian Acad Sci Sect B 26(6): 236-275


Accession: 024431403

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Interspecific crosses between S. orientale and S. prostratum were made reciprocally and the sterile hybrid was made fertile by induction of am-phidiploidy through colchicine. Details of meiosis of S. orientale, one of the parents employed, were worked out. The peculiar persistence of the nucleus and its movements during the meiotic cycle are recorded. The other parent, S. prostratum, has also been cytologically studied. The sterile hybrid shows irregular meiosis with scattered bivalents and univalents in the metaphase plate, leading to the ultimate formation of abnormal sporads. The fertile amphidiploid shows regular meiosis. The behavior of the nucleolus, with special regard to its persistence and movements, is discussed. Interspecific hybridization as a guide to ancestral homology and the artificial synthesis of new spp. are discussed in the light of cytological data gathered in the present study. The origin of cultivated Til, S. orientale, from a putative ancestor having n = 7 through allopolyploidy is indicated. The origin of the wild S. prostratum is also traced to an ancestral form, in which n = 8, through autopolyploidy.