Indian Society of Genetics & Plant Breeding

Study of fertilization barriers in crosses between Sesamum indicum and its wild relatives

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Crosses were made using the cultivated species S. indicum
cv. OS-1 and cv. E-8 as the male parents and the wild
species S. occidentale, S. radiatum and S. mulayanum as
the female parents. Studies on field pollination and in
vivo pollen germination, the barriers to hybridization were
classified as post-zygotic, in the crosses S. occidentale
x OS-1, S. occidentale x E-8, S. radiatum x OS-1 and S.
radiatum x E-8. Seeds observed were shrivelled and
failed to germinate. Embryo abortion at the later stages
may be the major cause for hybrid inviability. In the
crosses with S. mulayanum as the female parent, viable
F1 's were obtained indicating absence of fertilization
barriers. The possible roles of the enzymes, esterases
and peroxidases in cross-compatibility were studied but
none was found to affect inter-specific compatibility.

Keywords: Sesamum, Aniline Blue, Cross-(in)compatibility, esterases, peroxidases, zygotic barriers


Year: 2003
Volume: 63
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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