Journal article

Publication year: 1986

Pages: 287-295

Journal: British phycological journal

Volume number: 21

Issue number: 3

ISSN: 0007-1617

DOI Link: https://doi.org/10.1080/00071618600650341

Publisher: Acad. Pr.

Abstract: 
Changes of DNA content of nuclei during the life cycle of Derbesia tenuissima, D. marina and D. cf. novae-zelandiae have been studied under culture conditions. In D. tenuissima ranges of DNA contents in the nuclei of the sporophytic filaments, gametophytes and macrogametes are identical, and the nuclei are hence considered as haploid. Karyogamy is indicated by higher DNA contents of nuclei in young sporangia of heterokaryotic sporophytes. There are no indications of karyogamy in homokaryotic sporophytes raised from macrogametes by parthenogenesis. In D. marina and D. cf. novae-zelandiae both the sporophytic filaments and gametophytes have identical ranges of DNA contents of their nuclei. Furthermore, in young sporangia of D. marina DNA contents including diploid nuclei were found. It is presumed that meiotic divisions of diploid nuclei take place soon after karyogamy without prior mitotic divisions and the life cycle of all three species is considered to be haplo-heterokaryotic. In D. cf. novae-zelandiae a heteromorphic life history with a Halicystis phase has been observed.

Harvard Citation style: ECKHARDT, R., SCHNETTER, R. and SEIBOLD, G. (1986) NUCLEAR BEHAVIOR DURING THE LIFE-CYCLE OF DERBESIA (CHLOROPHYCEAE), BRITISH PHYCOLOGICAL JOURNAL, 21(3), pp. 287-295. https://doi.org/10.1080/00071618600650341

APA Citation style: ECKHARDT, R., SCHNETTER, R., & SEIBOLD, G. (1986). NUCLEAR BEHAVIOR DURING THE LIFE-CYCLE OF DERBESIA (CHLOROPHYCEAE). BRITISH PHYCOLOGICAL JOURNAL. 21(3), 287-295. https://doi.org/10.1080/00071618600650341