ibclogo XVI International Botanical Congess

Abstract Number: 2493
Poster No. = 1616


DISTRIBUTION OF GAMMA-TUBULIN IN MEIOSIS OF BRYOPHYTES


M. Shimamura,1 H. Deguchi,1 M. Yamato,2 T. Horio,2 N. Nishihara,1 H. Hosoya,1 Y. Mineyuki.1 1 Dept. of Biol. Sci., Fac. of Sci., Hiroshima Univ., Higashi-Hiroshima, 739-8526, Japan. 2 School of Med., Univ. of Tokushima, Tokushima, 770-0042, Japan.


Distribution of gamma-tubulin was observed during the meiosis for four species of bryophytes with spore tetrads of their own shapes. In Anthoceros, Dumortiera and Haplomitrium, the plastid based quadripolar microtubule system (QMS) appears in prophase-I that is thought to be involved in the premeiotic plastid partitioning and the division pattern determination. Gamma-tubulin was localized in the pole region of the QMS. On the contrary, not QMS but radial microtubule systems are thought to be involved in the division-pattern determination in Conocepharum. In this case, gamma-tubulin was observed on the nuclear surface, from which radial microtubules emanated.

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