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Primary Structure and Intercellular Space Formation of Feeding Root in Sonneratia alba J. Smith

Author(s): Hery Purnobasuki

Journal: International Journal of Botany
ISSN 1811-9700

Volume: 9;
Issue: 1;
Start page: 44;
Date: 2013;
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Keywords: schizogenous | feeding root | Cortical meristem | intercellular space

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.

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