Identification of a New Kind of Cytomixis in Himalayan Panax (Panax pseudo-ginseng subsp. himalaicus Hara)
1986 年 51 巻 2 号 p. 301-308
詳細
1986 年 51 巻 2 号 p. 301-308
Cytomixis involving mostly the additional micronucleus was observed in only pollen mother cells of Panax pseudo-ginseng subsp. himalaicus Hara. The micro-nucleus comprised three associated single chromosomes. Heterochromatic ele-ments(s) in these chromosomes may be responsible for this unusual cytomixis. Such micronuclear cytomixis, its rare effect on normal nucleus and other undefined but plausible factor(s) like misdivisions in binucleate PMCs might account for large derangement of chromosome number in this plant. Erroneous cell divisions in absence of cytomixis hava been suggested as a possible factor in causing small deviations in chromosomal counts in somatic cells of otherwise cytomictic individuals.
