Spatial Patterns of Sucrose-Inducible and Polygalacturonic Acid-Inducible Expression of Genes That Encode Sporamin and β-Amylase in Sweet Potato : GENE STRUCTURE AND EXPRESSION
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概要
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Two major proteins of tuberous roots of sweet potato, sporamin and β-amylase, were detected in storage parenchyma cells, which contain a large amount of starch. In both the leaves and petioles of sweet potato, the sucrose-induced accumulation of mRNAs for sporamin and β-amylase, and of starch occurred in a wide variety of cells, first in cells within and around the vascular tissue and then in various cells distal to them, with the exception of epidermal cells. In the mesophyll cells of leaves treated with sucrose, the accumulation of large numbers of well-developed starch granules occurred in the preexisting chloroplasts. These results, together with the previous observation that the sucrose-induced accumulation of sporamin, of β-amylase and of starch occurs with similar dependency on the concentration of sucrose, suggest that an excess supply of sugars to various types of cell triggers a cellular transition that induces the simultaneous accumulation of these reserve materials that are normally present in tuberous roots. Accumulation of mRNAs for sporamin and β-amylase, but not the accumulation of starch, in leaves and petioles can be also induced when leaf-petiole cuttings are supplied with low concentrations of polygalacturonic acid (PGA) at their cut edges. The spatial patterns of accumulation of mRNAs for sporamin and β-amylase in leaves and petioles after treatment with PGA were found to be similar to those observed upon treatment with sucrose. These results suggest that most of the cells in leaves and petioles have the capacity to respond to both a carbohydrate metabolic signal and a PGA-derived signal that is transmitted by diffusion from the vascular system.
- 日本植物生理学会の論文
著者
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NISHIMURA Mikio
Department of Cell Biology, National Institute for Basic Biology
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NAKAMURA Kenzo
Laboratory of Biochemistry, Graduate School of Bioagricultural Sciences, Nagoya University
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Matsuoka Ken
Laboratory Of Biochemistry School Of Agricultural Sciences Nagoya University
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Nishimura Mikio
Department Of Cell Biology National Institute For Basic Biology
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Nishimura Mikio
Department Of Cell Biology National Institute Of Basic Biology
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Takeda Shin
Laboratory of Biochemistry, School of Agriculture, Nagoya University
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Kowyama Yasuo
Plant Breeding Laboratory, Faculty of Bioresources, Mie University
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Takeuchi Yuka
Department of Cell Biology, National Institute of Basic Biology
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Takeda S
Department Of Natural Science Osaka Women's University
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Matsuoka Ken
Laboratory Of Biochemistry Faculty Of Agriculture Nagoya University
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Matsuoka Ken
Laboratory Of Biochemistry School Of Agriculture Nagoya University
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Kowyama Yasuo
Plant Breeding Laboratory Faculty Of Bioresources Mie University
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Takeuchi Yuka
Department Of Cell Biology National Institute For Basic Biology
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Takeuchi Yuka
Department Of Cell Biology National Institute Of Basic Biology
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Nakamura Kenzo
Laboratory Of Biochemistry Faculty Of Agriculture Nagoya University
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Takeda Shin
Laboratory Of Biochemistry School Of Agriculture Nagoya University:(present)department Of Molocular
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Takeda Shin
Laboratory Of Biochemistry School Of Agriculture Nagoya University
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