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The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 99, Issue 3, pp 241–266 | Cite as

Ovule and seed ontogeny inGnetum gnemon L.

  • Tokushiro Takaso
  • Ferdinand Bouman
Article

Abstract

The ovule ofGnetum gnemon has three envelopes around the nucellus. The outer one forms two clear swellings at the lateral sides during the early developmental stages. The middle envelope also shows two swellings in many cases arranged decussately with respect to those of the outer one. All these swellings become obscure or disappear later. The inner envelope arises as an annular primordium and forms several manifest lobes at the stage of pollination. it develops two proliferating structures from its middle portion, viz., a flange and a micropyle-closing tissue. The three envelopes differentiatiate into the fleshy outer, sclerenchymatic middle and compressed inner layers of the seed coat, respectively. The inner one, however, remains restricted to the apical part of the seed owing to endochalazal growth. The outer envelope is derived from both dermal and subdermal cells of the ovule primordium and, therefore, is of dual origin. The middle and inner envelopes are subdermal in origin. The present study has cleared up some conflicting reports in the previous publications.

Key words

Gnetum Gymnosperms Integument Morphology Ovule Seed coat 

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References

  1. Beccari, O. 1877. Della organogenia dei fiori feminei delGnetum gnemon L. Nuovo Giorn. Bot. Ital.9: 91–100.Google Scholar
  2. Berridge, E.M. 1911. On some points of resemblance between Gnetalean and Bennettitean seeds. New Phytol.10: 140–144.CrossRefGoogle Scholar
  3. Blume, C.L. 1848. Rumphia, sive commentationes botanicae. Vol. 4. (31). De Gnetaceis. 1–10, Leiden.Google Scholar
  4. Bouman, F. 1984. The ovule.In: B.M. Johri, ed., Embryology of Angiosperms p. 123–157. Springer Verlag, Berlin.Google Scholar
  5. Brown, R. 1827. Character and description ofKingia, a new genus of plants found on the south-west coast of New Holland: with observations on the structure of its unim-pregnated ovulum; and on the female flower of Cycadeae and Coniferae.In: P.P. King, Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the Years 1818 and 1812,2: 534–565. London.Google Scholar
  6. Coulter, J.M. 1908. The embryo sac and embryo ofGnetum gnemon. Bot. Gaz.46: 43–49.CrossRefGoogle Scholar
  7. Fagerlind, F. 1941. Bau und Entwicklung derGnetum-Gametophyten. Kung. Svenska Vet. Akad. Handl.19: 1–55.Google Scholar
  8. — 1946. Strobilus und Blüte vonGnetum und die Möglichkeit, aus ihrer Struktur den Blütenbau der Angiospermen zu deuten. Arkiv Bot.33: 1–57.Google Scholar
  9. Griffith, W. 1859. Remarks onGnetum. Trans. Linn. Soc.22: 299–312.Google Scholar
  10. Hagerup, O. 1934. Zur Abstammung einiger Angiospermen durch Gnetales und Coniferae. Kgl. Danske Vidensk. Selsk. Biol. Medd.11: 1–83.Google Scholar
  11. Hooker, J.D. 1863. OnWelwitschia, a new genus of Gnetaceae. Trans. Linn. Soc.24: 1–48.CrossRefGoogle Scholar
  12. Karsten, G. 1892. Beitrag zur Entwickelungsgeschichte einigerGnetum-Arten. Bot. Zeit.50: 205–215, 221–231, 237–246.Google Scholar
  13. — 1893. Zur Entwickelungs-Geschichte der GattungGnetum. Beitr. Biol. Pfl.6: 337–382.Google Scholar
  14. Lehmann-Baerts, M. 1967. Études sur les Gnétales-VIII. Ontogenèse ovulaire chezGnetum africanum etEphedra distachya. Cellule66: 311–327.Google Scholar
  15. Maheshwari, P. andV. Vasil. 1961.Gnetum. Bot. Monogr. No. 1. Council Sci. Industr. Res., New Delhi.Google Scholar
  16. Markgraf, F. 1930. Monographie der GattungGnetum. Bull. Jard. Bot. Buitenz.10: 407–511.Google Scholar
  17. Martens, P. 1959. Études sur les Gnétales-III. Structure et ontogenèse du cône et de la fleur femelles deWelwitschia mirabilis. Cellule60: 169–286.Google Scholar
  18. — 1963. Études sur les Gnétales-VI. Recherches surWelwitschia mirabilis-III. L'ovule et le sac embryonnaire. Les sacs embryonnaires extra-floraux. Cellule63: 307–329.Google Scholar
  19. — 1971. Les Gnétophytes. Handbuch der Pflanzenanatomie, Band XII, Teil 2. Borntraeger, Berlin.Google Scholar
  20. Muhammad, A.F. andR. Sattler. 1982. Vessel structure ofGnetum and the origin of angiosperms. Amer. J. Bot.69: 1004–1021.CrossRefGoogle Scholar
  21. Negi, V. andMadhulata. 1957. Male gametophyte and megasporogenesis inGnetum. Phytomorphology7: 230–236.Google Scholar
  22. Pankow, H. 1962. Histogenetische Studien an den Blüten einiger Phanerogamen. Bot. Stud.13: 1–106.Google Scholar
  23. Pearson, H.H.W. 1915. Notes on the morphology of certain structures concerned in reproduction in the genusGnetum. J. Linn. Soc.43: 55–56.Google Scholar
  24. — 1929. Gnetales. Cambridge Univ. Press, London.Google Scholar
  25. — andM.R.H. Thomson. 1917. On some stages in the life history ofGnetum. Trans. Roy. Soc. S. Afr.6: 231–269.Google Scholar
  26. Quisumbing, E. 1925. Stony layer in seeds of gymnosperms. Bot. Gaz.79: 121–195.CrossRefGoogle Scholar
  27. Rodin, R.J. andR.N. Kapil. 1969. Comparative anatomy of the seed coats ofGnetum and their probable evolution. Amer. J. Bot.56: 420–431.CrossRefGoogle Scholar
  28. Sanwal, M. 1962. Morphology and embryology ofGnetum gnemon L. Phytomorphology:12: 243–264.Google Scholar
  29. Singh, H. 1978. Embryology of Gymnosperms. Handbuch der Pflanzenanatomie, Band X, Teil 2. Borntraeger, Berlin.Google Scholar
  30. Strasburger, E. 1872. Die Coniferen und die Gnetaceen. Dabis, Jena.Google Scholar
  31. — 1879. Die Angiospermen und die Gymnospermen. Fischer, Jena.Google Scholar
  32. Takaso, T. 1985. A developmental study of the integument in gymnosperms 3.Ephedra distachya L. andE. equisetina Bge. Acta Bot. Neerl.34: 33–48.Google Scholar
  33. Thoday, M.G. 1911. The female inflorescence and ovules ofGnetum africanum, with notes onGnetum scandens. Ann. Bot.25: 1101–1135.Google Scholar
  34. — 1921. Anatomy of the ovule and seed inGnetum gnemon, with notes onGnetum funiculare. Ann. Bot.35: 37–53.Google Scholar
  35. — andE.M. Berridge. 1912. The anatomy and morphology of the inflorescences and flowers ofEphedra. Ann. Bot.:26: 953–985.Google Scholar
  36. Thompson, W.P. 1916. The morphology and affinities ofGnetum. Amer. J. Bot.:3: 135–184.CrossRefGoogle Scholar
  37. Vasil, V. 1959. Morphology and embryology ofGnetum ula Brongn. Phytomorphology,9: 167–215.Google Scholar
  38. Waterkeyn, L. 1954. Études sur les Gnétales-I. Le strobile femelle, l'ovule et la graine deGnetum africanum Welw. Cellule,56: 103–146.Google Scholar
  39. — 1960. Études sur les Gnétales-IV. Le tube micropylaire et la chambre pollinique deGnetum africanum Welw. Cellule,61: 79–95.Google Scholar

Copyright information

© Botanical Society of Japan 1986

Authors and Affiliations

  • Tokushiro Takaso
    • 1
  • Ferdinand Bouman
    • 1
  1. 1.Hugo de Vries LaboratoriumUniversiteit van AmsterdamAmsterdam

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