Y. K. Lee, M. S. Hwang, I. K. Lee
Sexual Differentiation of Griffithsia monilis (Ceramiales, Rhodophyta) in Hybrids between Female and Male Thalli
Hybrids between male and female thalli of Griffithsia monilis were obtained from somatic cell fusion and regeneration of the fusion cells. The hybrid cells were fused using a wound-healing process, and the fusion cells developed into morphologically normal mature thalli. The hybrids, however, were abnormal in sexual differentiation showing bisexual and bisexual/mixed-phase reproduction. The bisexual/mixed-phase thalli produced tetrasporangia as well as female procarps and male spermatangia. Tetrasporangia were always produced together with spermatangia on a single axial cell. Tetraspores released from the bisexual/mixed-phase thalli developed into male, female, bisexual or bisexual/mixed-phase thalli. The DNA ploidy level indicated that the nuclear phase of bisexual/mixed-phase thalli was haploid. Previously reported models on mixed-phase reproduction such as nuclear co-action and nuclear fusion could not explain the haploid mixed-phase phenomenon. Therefore, a new model, genetic regulation of sex-determining genes, is proposed in this paper.
Botanica Marina, Walter de Gruyter
Print ISSN: 0006-8055
Volume: 44, 11/2001
Pages: 547 - 557
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