PJB-2024-103
COMPARATIVE ANATOMICAL STUDY ON LATICIFERS IN SIX APOCYNACEAE SPECIES
Meng Zhao
Abstract
In this study, three subfamilies, six species (Cynanchum thesiodes, Periploca sepium, Cynanchum chinense, Asclepias curassavica, Metaplexis japonica and Catharanthus roseus) of Apocynaceae were selected as the research objects to illustrate the structural characteristics and distribution of laticifer, aiming to provide an anatomical basis for the further study of laticifer and the classification of Apocynaceae. The type, size and distribution of laticifer in the stems and leaves of six species were studied with the method of comparative anatomy. The results showed that laticifers in the stems of Cynanchum thesiodes, Periploca sepium, Cynanchum chinense, Asclepias curassavica, Metaplexis japonica and Catharanthus roseus were all non-articulated unbranched laticifers and were distributed in cortex and pith; laticifers in leaves of Cynanchum thesiodes, Periploca sepium, Cynanchum chinense were articulated branched laticifer, while those in the leaves of Asclepias curassavica, Metaplexis japonica were non-articulated branched laticifer with Y-shaped branches. Those in the leaves of Catharanthus roseus were articulated unbranched laticifer. Laticifers in the leaves of the six Apocynaceae plants mainly were distributed in the interior of spongy mesophylls and the exterior of palisade cells, and a few were distributed in the exterior of phloem.
To Cite this article:
Download
