Comparative androecium morphogenesis ofSicyos angulatus andSechium edule (Cucurbitaceae) |
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Authors: | Ryoko Imaichi Kyoko Okamoto |
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Institution: | (1) Faculty of Agriculture, Tamagawa University, Tamagawagakuen 6-1-1, Machida, 194 Tokyo, Japan |
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Abstract: | “Androecium” ofSicyos angulatus andSechium edule is unique in having a solid central column below a head portion with thecae. Its morphogenesis was examined for the two species.
The developmental course is composed of two distinct successive phases; (1) establishment of stamen primordia and (2) uplift
of the stamen primordia caused by development of a central column below them. In the first phase, there is a difference between
the two species; inSicyos angulatus, two bithecal and one monothecal stamen primordia are formed by congenital fusion among preformed five protrsions, whilst
inSechium edule, three or four monothecal stamen primordia are formed without fusion. The central column is later produced by intercalary
growth in a region below the stamen primordia in both species. Concomitant with central column development, the center of
the floral primordium, which was surrounded by the early formed stamen primordia, is raised up to the top of the central column.
The central column could be interpreted as a receptacular column, and not as congenitally fused stamen filaments, as currently
believed. The “androecium” of the both species is considered an androecium complex, which consists of the stamens and a receptacular
column. |
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Keywords: | Androecium Central column Congenital fusion Evolutionary trend Morphogenesis Cucurbitaceae |
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