Corolla tube formation in six species of apocynaceae |
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Authors: | Eisho Nishino |
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Institution: | (1) Biological Laboratory, College of Arts and Sciences, Chiba University, Yagoicho, 260 Chiba |
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Abstract: | Corolla tube formation inTrachelospermum asiaticum, Nerium indicum var.leucanthum, Anodendrom affine, Vinca major, Catharanthus roseus andAmsonia elliptica was investigated anatomically.
The corolla tube formation among these species is basically similar. The bases of petal primordia extend laterally to the
interprimordial regions, the upward growth occurrig at those regions just beside the petal bases. The extending petal bases
connect with each other at the bases of the abaxial side of stamen primordia in the early stage of the corolla development.
The upward growth at the coonnected regions results in the formation of a short corolla tube but is weakened rapidly. At the
stage of the mutual connection of petal bases, a common base of petal and stamen primordia is initiated. This common base
develops into the lower portion of the corolla tube, i.e. the portion below the stamen insertion.
In a relatively late stage, adjacent margins, of the corolla lobes fuse postgenitally at their lower portions, resulting in
the formation of almost all of the upper portion of the corolla tube.
The corona inNerium andVinca is initiated by the active adaxial growth of the upper portion of the corolla tube. |
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Keywords: | Apocynaceae Corolla tube formation Morphology |
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