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OVULE ONTOGENY AND SEED DEVELOPMENT IN POTAMOGETON NATANS L. (POTAMOGETONACEAE), WITH A NOTE ON THE CAMPYLOTROPOUS OVULE
Author(s) -
Takaso T.,
Bouman F.
Publication year - 1984
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1984.tb01843.x
Subject(s) - ovule , biology , gynoecium , botany , vascular bundle , stamen , pollen
SUMMARY The ovule of Potamogeton natans is crassinucellate, bitegmic and ortho‐campylotropous. Both integuments are dermal in origin and develop by intercalary growth. The seed coat consists of the compressed layers of the integuments, of which only the outer layer shows cell wall thickenings. The campylotropous curvature differs from the usual types and is brought about by a proliferation of the adaxial carpel wall. The terminology, structure and functional aspects of the different ovule types are discussed.