Cytological Analysis in the Microsporogenesis of Ramie, Boehmeria nivea Gaud. (Urticaceae) and the Effect of Colchicine on the Chiasma Frequency.

概要

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Cytological analysis were done in microsporogenesis of <I>Boehmeria nivea</I> (ramie) var.'Miyasaki' which was treated with 0.1+0.1% colchicine solution in seed and seedling phases. Control plants without any treatment in seed and seedling phases were also analyzed. Meiosis was normal except for the occurrence of cytomixis in both control and treated plants. Colchicine did not cause cytomixis occurrence. It was supposed that this phenomenon would be associated with crop culture condition. Although colchicine treatment was not effective to induce chromosome duplication, it may have caused reduction in average of chiasma number per cell and also reduction in pollen grain germination. Two types of pollen with different cytoplasm content were noticed in treated and in control plants. One type had full cytoplasm and other type had less cytoplasm which in many cases was wrinckled. It was supposed that this latter pollen type was consequence of cytomixis. Only full pollen grains germinated in agar media. Test for apomixis in 'Miyasaki' variety showed it did not form apomictic fruits, either in control or in 0.1+0.1% treated plants.
財団法人日本メンデル協会の論文