Abstract

Removal of floral segments from Dendrobium (Orchidaceae) flowers indicates that resupination may be regulated or is at least affected by pollinia and/or stigmas. Other floral segments do not appear to have a direct effect. However, excision of the perianth may result in senescence and death, which could be caused by desiccation and/or ethylene evolution.

Highlights

  • Title RESUPINATION IN FLOWERS OF 2 DENDROBIUM (ORCHIDACEAE) HYBRIDS - EFFECTS OF NODAL POSITION AND REMOVAL OF FLORAL SEGMENTS

  • Removal of noral segments from Dendrobium (Orchidaceae) nowers indica1es 1ha1 resupination may be regulated or is at least affected by pollinia and/or stigmas

  • It is assumed to position the flowers in a manner that facilitates pollination (VAN DER PIJL and DODSON 1966; DRESSLER 1981)

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Summary

Introduction

Title RESUPINATION IN FLOWERS OF 2 DENDROBIUM (ORCHIDACEAE) HYBRIDS - EFFECTS OF NODAL POSITION AND REMOVAL OF FLORAL SEGMENTS. RESUPINATION IN FLOWERS OF TWO DENDROBIUM (ORCHIDACEAE) HYBRIDS : EFFECTS OF NODAL POSITION AND REMOVAL OF FLORAL SEGMENTS. Removal of noral segments from Dendrobium (Orchidaceae) nowers indica1es 1ha resupination may be regulated or is at least affected by pollinia and/or stigmas. The amount of torsion by individual flowers depends on the angle of the inflorescence relative to the ground and the orientation of the pedicel. Buds and young flowers are capable of resupination (NYMAN et al 1984). The physiological processes that regulate or affect resupination are unknown , and the effects on torsion of floral segments and/or the nodal position of a blossom have not been examined

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