Publication: Structure and development of cortical bundles in Couroupita guianensis Aubl. (Lecythidaceae)
Authors
Rajput, Kishore Shankarsinh ; Patil, Vidya Shivram
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Publisher
Universidad de Murcia
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DOI
http://dx.doi.org/10.6018/analesbio.38.10
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info:eu-repo/semantics/article
Description
Abstract
Estructura y desarrollo de haces corticales en Couroupita
guianensis Aubl. (Lecythidaceae)
El desarrollo de haces corticales, en ramas y pedúnculos de Couroupita
guianensis (Lecythidaceae), comienza cerca del meristemo
apical concomitante con los haces vasculares normales. Cada haz
cortical llega a estar rodeado por una vaina de fibras que, a menudo,
mostraba la presencia de una capa gelatinosa (fibras G). A medida
que avanza el crecimiento, cada haz se puede dividir en dos o
tres haces. Algunos de los haces son mayores y muestran elementos
vasculares bien diferenciados debido a su asociación con frutos
en desarrollo, mientras que los más pequeños, con pocos vasos,
pueden ser trazas foliares o de yemas de flores que caen antes
de la fecundación. El xilema secundario del haz cortical está
compuesto de vasos, fibras y células del parénquima axial, mientras
que el floema consiste en tubos cribosos, células de acompa-
ñamiento y células del parénquima axial.
The development of cortical bundles, in the branches and peduncles of Couroupita guianensis (Lecythidaceae), initiates close to the apical meristem concomitant with the normal vascular bundles. Each cortical bundle becomes surrounded by a sheath of fibres, which most often showed presence of gelatinous layer (G-fibres). As growth progresses, theses bundle may divide into two-three bundles. Some of the bundles are larger and show well differentiated vascular elements due to their association with developing fruits while narrower bundles, with few vessels, may be leaf traces or flower bud traces that fell down before fertilization. The secondary xylem of cortical bundle is composed of vessels, fibres and axial parenchyma cells while phloem consiste of sieve tubes, companion cells and axial parenchyma cells.
The development of cortical bundles, in the branches and peduncles of Couroupita guianensis (Lecythidaceae), initiates close to the apical meristem concomitant with the normal vascular bundles. Each cortical bundle becomes surrounded by a sheath of fibres, which most often showed presence of gelatinous layer (G-fibres). As growth progresses, theses bundle may divide into two-three bundles. Some of the bundles are larger and show well differentiated vascular elements due to their association with developing fruits while narrower bundles, with few vessels, may be leaf traces or flower bud traces that fell down before fertilization. The secondary xylem of cortical bundle is composed of vessels, fibres and axial parenchyma cells while phloem consiste of sieve tubes, companion cells and axial parenchyma cells.
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