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- Title
Anisophylly in Aucuba japonica (Cornaceae): An outcome of spatial crowding in the bud.
- Authors
Ali, Md. Sohrab; Kikuzawa, Kihachiro
- Abstract
Anisophylly in Aucuba japonica Thunb. occurs exclusively in axillary buds on shoots of individuals that have reached reproductive maturity; juvenile plants or sprouts and shoots from terminal vegetative buds on adult plants are isophyllous. The initially smaller leaf primordium in each anisophyllous leaf pair gives rise to the larger final leaf size. Immediately before bud break, the size of the initially smaller primordium is already almost twice as large as the initially larger primordium, and the size differential is further amplified following bud break. The degree of aniso phylly, however, varies among the nodes of a shoot, depending on leaf pair orientation (tangential or parallel to the inflorescence axis) and nodal position. Paired leaves approach isophylly when they originate tangential to an inflorescence but become anisophyllous when originating parallel to an inflorescence. The degree of anisophylly depends on crown light conditions through effects on terminal bud size and foliage distribution on the shoot, but ultimately appears to arise from space limitations and crowding between the leaf primordia and the developing inflorescence in terminal reproductive buds.
- Subjects
BUDS; PLANT shoots; SPROUTS; VEGETATION &; climate; INFLORESCENCES; LEAVES; ANATOMY
- Publication
Canadian Journal of Botany, 2005, Vol 83, Issue 2, p143
- ISSN
0008-4026
- Publication type
Article
- DOI
10.1139/B04-157