Stipular colleters in Psychotria nuda (Cham. & Schltdl.) Wawra (Rubiaceae): micromorphology, anatomy and cristals microanalysis

Acta Botanica Brasilica

Emílio De Castro Miguel¹  Daniel Gomes De Moraes¹  Maura Da Cunha¹ 

[1] ,Universidade Estadual do Norte Fluminense Darcy Ribeiro Centro de Biociência e Biotecnologia Laboratório de Biologia Celular e TecidualCampos dos Goytacazes RJ ,Brasil

关键词: Calcium crystals;    colleters;    secretory structure;    Rubiaceae;    cristais de oxalato de cálcio;    coléteres;    estrutura secretora;    Rubiaceae;   

DOI  :  10.1590/S0102-33062009000400013

来源: SciELO

【 摘 要 】

Colleters are secretory structures, with a protective function, that occur in different organs and in many Angiospermae families. The aim of this work was to describe the anatomy and micromorphology of colleters present in Psychotria nuda (Cham. & Schltdl.) Wawra as well as analyze the structure and composition of crystals from the central axis of the structure under study. The material was collected at the Tinguá Biological Reserve and processed according to usual techniques for light and scanning electron microscopy. The colleters are of the lachrymiform type, with an elongated central axis, formed by fundamental parenchyma, sheathed by a palisade layer, responsible for the secretion. Raphid crystals were observed in the central axis of the colleters. By X-ray microanalysis it was possible to show calcium predominance in these structures.

【 授权许可】

CC BY   
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