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Causes of low seed set in
the natural tetraploid Trifolium pratense L. (Fabaceae)
H. Nurhan Bakar Buyukkartal
Departmant of Biology, Faculty of Science, Ankara
University, Tandoğan, ANKARA, TÜRKIYE, 06100.
E-mail:
H.Nurhan.Buyukkartal@science.ankara.edu.tr
Accepted 6 March, 2008 |
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Light and electron microscopic examinations were done at the
cell level to research which factors would effect seed
formation and the amount of effectiveness of natural
tetraploid Trifolium
pratense L.
variety E2. In this investigation, origin of factors
handicapping the seed formation and the results were
determined by examining the development of ovule at six
different phases to ovary size from the begining to
formation of the seed. In this study, we observed that
mature embryo sac was formed in 18% of ovules examined, but
seed formation was obtained only in 5.8%. As the rate of
seed set was lower than formation of the mature embryo sac,
this investigation was done with the aim of determining the
degeneration of the cells in the natural tetraploid T.
pratense L. ovules.
Key words:
Seed set, Trifolium pratense L., ultrastructure. |
