Abstract
Hybridzygotes of Coelomomyces dodgei and Coelomomyces punctatus can be produced in the laboratory by making reciprocal crosses of their gametes. Although the F1 hybrid sporophyte is viable, the F1 gametophyte is inviable. Gametangial dehiscence (gamete release) in both species is relatively synchronous and follows a photoperiod-dependent diel periodicity, but even in populations grown under identical conditions, the gametes of each species are released during significantly different time frames. When the fungi are reared on an 8/16-hr dark/light regime, the gametes of C. punctatus are released during hours 7-11, whereas those of C. dodgei are released during hours 16-19. These results demonstrate that gametangial dehiscence is gated and, furthermore, indicate that this gating serves as a temporal reproductive isolating mechanism for these species of Coelomomyces. Additional preliminary studies with C. dodgei demonstrate that gametogenesis and gametangial dehiscence are photoperiod-dependent functions triggered by the onset of the dark period during the last day of gametophyte development, a dark period as short as 2 hr being sufficient to stimulate gametogenesis and gametangial dehiscence.
Keywords: sympatric species, photoperiod, gamete release, fungal systematics
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Chapman H. C., Glenn F. E., Jr Incidence of the fungus Coelomomyces punctatus and C. dodgei in larval populations of the mosquito Anopheles crucians in two Louisiana ponds. J Invertebr Pathol. 1972 Mar;19(2):256–261. doi: 10.1016/0022-2011(72)90217-0. [DOI] [PubMed] [Google Scholar]
- Federici B. A., Chapman H. C. Coelomomyces dodgei: establishment of an in vivo laboratory culture. J Invertebr Pathol. 1977 Nov;30(3):288–297. doi: 10.1016/0022-2011(77)90136-7. [DOI] [PubMed] [Google Scholar]
- Federici B. A. Experimental hybridization of Coelomomyces dodgei and Coelomomyces punctatus. Proc Natl Acad Sci U S A. 1979 Sep;76(9):4425–4428. doi: 10.1073/pnas.76.9.4425. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Federici B. A., Roberts D. W. Experimental laboratory infection of mosquito larvae with fungi of the genus Coelomomyces. II. Experiments with Coelomomyces punctatus in Anopheles quadrimaculatus. J Invertebr Pathol. 1976 May;27(3):333–341. doi: 10.1016/0022-2011(76)90093-8. [DOI] [PubMed] [Google Scholar]