Primary structure and intercellular space formation of feeding root in
Sonneratia alba J. Smith
Department
of Biology, Airlangga University, J1 Mulyorejo (Kampus C Unair),
Surabaya-60115, Indonesia
Abstract
The aim of
this research was to know the primary structure and intercellular space
formation of feeding root in Sonneratia alba in order to relate their
development and structure of their function as environmental adaptation in
mangrove's root. The conventional histological techniques by Light Microscopy
(LM) were used to get anatomical datas. This root has no cork covering. Cells
of the meristem normally had dense cytoplasm and clear nucleus. Protoderm first
appeared as a distinct layer at the edge of the tiers of cortical meristem.
Root caps of feeding root of S. alba consist of two regions, i.e., weakly
stained central columella or statenchyma and well-stained peripheral regions.
The columella has 8-11 layers. The size of gas spaces is 100-320 μm. All the
cells in the cortex appear round in cross section. Between 0-500 μm distances
from the tip, few intercellular spaces and cortical cells are tightly packed.
At distance more than 500 μm from the tip, cortical cells began to separate
each other and resulted in the intercellular spaces between longitudinal files
of the cortical cells. Changes of cortex cells with developing gas spaces
suggested that cell separation (schizogenous) and enlargement of intercellular
spaces has occurred to form aerenchyma in these plants. From its shape,
structure and location, it seems clear that the primary structures of root
assists the root in penetrating the soil and absorbs nutrient. The present
study revealed that these plants have developed the structural adaptation in
their roots as adaptation to their anaerobic habitat. © 2013 Asian Network for
Scientific Information.
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