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Synorganisation without organ fusion in the flowers of Geranium robertianum (Geraniaceae) and its not so trivial obdiplostemony

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Background and Aims Synorganisation of floral organs, an important means in angiosperm flower evolution, is mostly realized by congenital or post-genital organ fusion. Intimate synorganisation of many floral organs without fusion, as present in Geranium robertianum, is poorly known and needs to be studied.
Obdiplostemony, the seemingly reversed position of two stamen whorls, widely distributed in core eudicots,
has been the subject of much attention, but there is confusion in the literature. Obdiplostemony occurs in
Geranium and whether and how it is involved in this synorganisation is explored here.
Methods Floral development and architecture were studied with light microscopy based on microtome section
series and with scanning electron microscopy.
Key Results Intimate synorganisation of floral organs is effected by the formation of five separate nectar canals for the proboscis of pollinators. Each nectar canal is formed by six adjacent organs from four organ whorls. In addition, the sepals are hooked together by the formation of longitudinal ribs and grooves, and provide a firm scaffold for the canals. Obdiplostemony provides a guide rail within each canal formed by the flanks of the antepetalous stamen filaments.
Conclusions Intimate synorganisation in flowers can be realized without any fusion, and obdiplostemony may
play a role in this synorganisation.
Key words: Angiosperms, diplostemony, floral architecture, floral development, floral morphology, fusion,
Geraniaceae, Geranium robertianum, obdiplostemony, synorganisation.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

: Oxford University Press on behalf of the Annals of Botany Company., 2010

Deskripsi Fisik

Annals of Botany 106: 687–695, 2010

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PERTANIAN.

Info Detail Spesifik

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yuli/agus

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