Cytological study of a male-sterile Cryptomeria japonica that does not release microspores from tetrads |
| |
Authors: | Hiroko Ueuma Eri Yoshii Yoshihiro Hosoo Hideaki Taira |
| |
Institution: | (1) Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Niigata 950-2181, Japan;(2) Tokamachi Area Forest ASS, Tokamachi, Niigata, Japan;(3) International Young Researchers Empowerment Center, Shinshu University, Kamiina, Nagano, Japan |
| |
Abstract: | To determine the mechanism of male-sterility Cryptomeria japonica tree Shindai3, the process of microspore development was observed under light and fluorescence microscopy. Microspore development
in the Shindai3 was normal until the tetrad stage, but separation of the microspores from the tetrads was not observed even
after callose had been degraded. In contrast to the microspore stage in a male-fertile tree, amorphous substances were observed
around tetrads in the Shindai3, and the amount of the amorphous substance increased from the middle of November to the middle
of December. The substances are hypothesized to prevent the separation of individual microspores from tetrads by inducing
adhesion between microspore cells within the tetrad or enclosing the tetrads. The form of the tetrads in the Shindai3 was
maintained until just before the pollen dispersal season, but they ultimately degenerated. The results of this study indicate
that the mechanism causing male sterility in Shindai3 differs from that previously reported for other male-sterile trees of
C. japonica. |
| |
Keywords: | Amorphous substances Callose Cryptomeria japonica Male sterility Tetrad |
本文献已被 SpringerLink 等数据库收录! |
|