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DEVELOPMENT OF OVULE AND SEED IN BEGONIA SQUAMULOSA HOOK. F.
Author(s) -
Boesewinkel F. D.,
De Lange A.
Publication year - 1983
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.1438-8677.1983.tb01737.x
Subject(s) - ovule , primordium , hook , operculum (bryozoa) , biology , megaspore , botany , begonia , pollen , engineering , genus , biochemistry , structural engineering , gene
SUMMARY In spite of the dizonate structure of the ovule primordium, the ovule is crassinucellate. Both integuments remain two‐layered and become crushed during seed development, the outer layer which differentiates into the exotesta excepted. A transverse ring of specialised testa cells helps to form a special zone of rupture by which the operculum lifts off.