Biosystematic studies of theClosterium peracerosum-strigosum-littorale complex

II. Reproductive isolation and morphological variation among several populations from the Northern Kanto Area in Japan
  • Makoto M. Watanabe
  • Terunobu Ichimura
Article

Abstract

Nine representative pairs of heterothallic (=self-sterile, cross-fertile) strains of theClosterium peracerosum-strigosum-littorale complex from the northern Kanto area in Japan have been studied under the defined standard culture conditions. Since a wall thickening at cell apices was observed in vegetative cells of all the strains, these strains turned out to belong to the morphological group II (Ichimura and Watanabe, 1976). The result of statistical analyses of their cell size variations corresponded well with the result of intercrossing experiments between them. It was shown that these strains are virtually composed of three biologically different groups which are morphologically distinct and reproductively isolated completely or at least partially from each other. For convenience, these three groups have been designated as II-A, II-B, and II-C in the order of from smaller to larger cell size. In intra-group crossings, a large number of zygospores were formed, and they germinated well to yield healthy populations of their progenies in all the three groups. In inter-group crossings, no sign of sexual reproduction was observed between Group II-A and Group II-C or Group II-B and Group II-C, and a marked decrease of zygospore formation was observed between Group II-A and Group II-B, especially between Group II-A minus and Group II-B plus. It was concluded that the distinctions between the three groups are biologically sound and that each represents an evolutionary unit.

Keywords

Paddy Field Reproductive Isolation Compatible Pair Biosystematic Study Sexual Reaction 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Brandham, P.E. andM.B.E. Godward. 1965. The inheritance of mating type in desmids. New Phytol.64: 428–435.CrossRefGoogle Scholar
  2. Brooks, A.E. 1966. The sexual cycle and intercrossing in the genusAstrephomene. J. Protozool.13: 367–375.PubMedGoogle Scholar
  3. Carefoot, R.J. 1966. Sexual reproduction and intercrossing inVolvulina steinii. J. Phycol.2: 150–156.Google Scholar
  4. Coleman, A.W. 1959. Sexual isolation inPandorina morum. J. Protozool.6: 249–264.Google Scholar
  5. Dobzhansky, Th. 1970. Genetics of the Evolutionary Process. Columbia Univ. Press, New York.Google Scholar
  6. Goldstein, M. 1964. Speciation and mating behavior inEudorina. J. Protozool.11: 317–344.Google Scholar
  7. Grant, M.C. andV.W. Proctor. 1972.Chara vulgaris andC. contraria: Patterns of reproductive isolation for two cosmopolitan species complex. Evolution26: 267–281.CrossRefGoogle Scholar
  8. Ichimura, T. 1971. Sexual cell division and conjugation-papilla formation in sexual reproduction ofClosterium strigosum. Proc. VIIth Inter. Seaweed Symp.: 208–214.Google Scholar
  9. —. 1974. TheClosterium calosporum complex from the Ryukyu Islands. Variation and taxonomical problems. Mem. Nat. Sci. Mus., Tokyo7: 89–102.Google Scholar
  10. —. 1976. Biosystematic studies of theClosterium peracerosum-strigosum-littorale complex. I. Morphological variation among the inbreeding populations and an experimental demonstration for source of the cell size variation. Bot. Mag. Tokyo89: 123–140.Google Scholar
  11. Ling, H.U. andP.A. Tyler. 1974. Interspecific hybridity in the desmid genusPleurotaenium. J. Phycol.10: 225–230.CrossRefGoogle Scholar
  12. Lippert, B.E. 1967. Sexual reproduction inClosterium moniliferum andCl. chrenbergii. J. Phycol.3: 182–198.Google Scholar
  13. Löve, A. 1964. The biological species concept and its evolutionary structure. Taxon13 (2): 33–45.CrossRefGoogle Scholar
  14. Magiure, B., Jr. 1963. The passive dispersal of small aquatic organisms and their colonization of isolated bodies of water. Ecol. Monogr.33: 161–185.CrossRefGoogle Scholar
  15. Mayr, E. 1963. Animal Species and Evolution. Belknap Harvard Press, Cambridge, Massachusetts.Google Scholar
  16. Nishihama, Y. 1972. Taxonomic entities in the genusClosterium: Some experimental approaches. Dr. Thesis, Hokkaido Univ. Japan.Google Scholar
  17. Proctor, V.W. 1970. Taxonomy ofChara braunii: An experimental approaches. J. Phycol.6: 317–321.Google Scholar
  18. — 1971.Chara globularis Thuillier (=C. fragilis Desvoux): Breeding patterns within a cosmopolitan complex. Limnol. Oceanogr.16: 422–436.CrossRefGoogle Scholar
  19. — 1975. The nature of Charophyte species. Phycologia14: 97–111.Google Scholar
  20. — 1976. Genetics of Charophyta.In R.A. Lewin, ed., The Genetics of Algae p. 210–218. Blackwell Sci. Publ., Oxford.Google Scholar
  21. —. 1967. Dispersal of aquatic organisms: Viability of disseminules recovered from the intestinal tract of captive kilder. Ecology48: 672–676.CrossRefGoogle Scholar
  22. —. 1971. An experimental approach to the systematics of the monoecious-conjoined members of the genusChara, seriesGymnobasalia. Amer. J. Bot.58: 885–893.CrossRefGoogle Scholar
  23. Stein, J.R. 1958. A morphologic and genetic study ofGonium pectorale. Amer. J. Bot.45: 664–672.CrossRefGoogle Scholar
  24. — 1965. Sexual populations ofGonium pectorale (Volvocales). Amer. J. Bot.52: 379–388.CrossRefGoogle Scholar
  25. — 1966. Effect of temperature on sexual populations ofGonium pectorale (Volvocales). Amer. J. Bot.53: 941–944.CrossRefGoogle Scholar
  26. Stewart, K.W. andH.E. Schlichting, Jr. 1966. Dispersal of algae and protozoa by selected aquatic insects. J. Ecol.54: 551–562.CrossRefGoogle Scholar
  27. Wiese, L. 1974. Nature of sex specific glycoprotein agglutinins inChlamydomonas. Ann. New York Acad. Sci.234: 383–395.Google Scholar

Copyright information

© The Botanical Society of Japan 1978

Authors and Affiliations

  • Makoto M. Watanabe
    • 1
    • 2
  • Terunobu Ichimura
    • 1
    • 2
  1. 1.Department of Botany, Faculty of ScienceHokkaido UniversitySapporo
  2. 2.Institute of Applied MicrobiologyUniversity of TokyoTokyo

Personalised recommendations