Sugar Accumulation along the Seminal Root Axis, as Affected by Osmotic Stress in Maize : A Possible Physiological Basis for Plastic Lateral Root Development(Crop Physiology and Ecology)
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概要
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We assumed that allocation of photosynthate is one of the main factors that regulate lateral root development in root systems under water deficit conditions. Six-days-old maize seedlings were exposed to osmotic stress (-0.21 MPa). Then, the sugar content of the 10mm segment of seminal roots sampled successively along the root axis was examined in relation to the development and elongation of lateral roots at 0, 1 and 2 after the start of the stress treatment. In the basal 0-40mm region of the seminal root, latenal roots emerged before the stress treatment, but further initiation and elongation of lateral roots in this region was inhibited by the stress treatment. In contrast, in the region more than 40mm distant from the base of the seminal root, lateral roots emerged after the start of stress treatment and their development was not influenced or was slightly promoted by the stress treatment as compared with the control plant. The concentrations of glucose and sucrose were determined for every 10mm segment along seminal root axis. The concentrations of glucose and sucrose tended to increase acropetally, and were increased by the stress treatment, especially in the apical 50-mm portions in both roots sampled after 1 day and 2 days of the stress treatment. On these root portions, while lateral roots had not yet developed when the root was sampled, lateral roots were initiated and they elongated one or two days later. These facts suggest that the accumulation of glucose and sucrose promoted lateral root development, and as a result, canceled the inhibitory effects of stress treatment, and thereby sustained lateral root development under osmotic stress conditions.
- 日本作物学会の論文
著者
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Yamauchi Akira
Graduate School of Bioagricultural Sciences, Nagoya University
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Ogawa Atsushi
Department of Pediatrics, School of Medicine, Fukuoka University
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Yamauchi Akira
Graduate School Of Bioagricultural Sciences Nagoya University
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Yamauchi Akira
Nagoya Univ. Nagoya Jpn
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Kawashima Choji
Department of Biological Production, Akita Prefectural University
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Ogawa Atsushi
Department Of Biological Production Akita Prefectural University
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Kawashima Choji
Department Of Biological Production Akita Prefectural University
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Ogawa Atsushi
Department Of Applied Physics Faculty Of Engineering Fukui University
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Ogawa Atsushi
Akita Prefectural Univ. Akita Jpn
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