ANATOMICAL RESPONSES OF ROOT TIPS TO BORON DEFICIENCY : III. Effect of Boron Deficiency on Sub-Cellular Structure of Root Tips, Particularly on Morphology of Cell Wall and Its Related Organelles
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概要
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Ultrastructural changes induced in young tomato root tip cells by the absence of boron from the nutrient solution were investigated with an electron microscope. Detailed observations of cortical cells revaled some ultrastructural effects of boron deficiency as follows : 1) Lock of boron disordered the shape and arrangement of cortical cells. The abnormal accumlation of a "lipid-like substance " was observed.2) In boron-deficient root tips, cell walls sufferend an irregular thickening followed by a rugged or serrated structure. Occasionally, the disorganization of middle lamelae occurred and an accumulation of numerous vesicles was observed in the disorganized area. These cell wall alterations appeared most distinctly in the longitudinal walls.3) Boron deficiency also caused an abnormal development of the Golgi apparatus. The number and size of secretory vesicles particularly increased in boron-deficient root tip cells. This abnormal development of the Golgi apparatus seemed to be related with the irregular thickening of cell walls.4) The effect of boron deficiency on cell walls and on the Golgi apparatus appeared primarily in the cells in the extension region and extended into the meristematic region as boron deficiency advanced.5) The irreversible damage on root elongation in the advanced stage of boron deficiency was not associated with any necrotic symptom at subcellular level such as a degradation of the membranous system or a decrease in the integrity of the ground substance.
- 社団法人日本土壌肥料学会の論文
著者
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Kumazawa Kikuo
Department Of Agricultural Chemistry The University Of Tokyo
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Kouchi Hiroshi
Department Of Agricultural Chemistry University Of Tokyo
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