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KMID : 0368419890320030163
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Journal of Plant Biology
1989 Volume.32 No. 3 p.163 ~ p.172
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Structure, Origin, Development and Senescence of Colleeters in Nerium indicum Mill.(N. odorum Soland., Apocynaceae)
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Vinoth Thomas
Yash Dave
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Abstract
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Nerium indicum has adxial basal colleters on each petiole, bract, bracteole, calyx and corolla. The cooleters are finger-shaped sometimes lobed structures with tall heads on short stalks. The petiolar colleters are more abundant than those on the bract, bracteole, calyx and corolla but their structure is similar. Meristematic activity in a small group of protodermal and hypodermal cells at the base of the developing leaf gives rise to the colleter that further differentiates by frequent anticlinal and periclinal divisions. Many of the colleters are vascullarized, sometimes a layer of redially elongated cells is present beneath the epithelial cells. Senescence of a clooeter begins when the leaves have either completed their growth or are still expanding. In senescent colleters, the central cell cytoplasm and nuclei are considerably reduced. Thin layer chromatography of the freshly harvested exudate of colleter shows the presence of rhamnose, glucose and arabinose sugars.
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