Regulation of Photosynthetic Metabolism by Low-Temperature Treatment of Roots of Single-Rooted Soybean Plants

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概要

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• The single-rooted leaf of soybean (Glycine max L. Merr.) was used to study source-sink relationships in photosynthesis. The roots grown in a culture solution at 20±1℃ were treated with low temperatures (minimum 6℃) for 4 days to change the source/sink balance. This treatment suppressed the increase of root dry weight, but by 2 days after the end of the treatment, the leaf dry weight showed a 1.7-fold increase mainly due to the accumulation of starch and sucrose. In the roots, both contents also increased significantly. The sucrose and starch contents in leaves and the sucrose content in roots began decreasing immediately after the treatment was stopped, while the starch content in roots remained at the high level. The leaf area did not change throughout the experimental period. The low-temperature treatment of the roots caused an abrupt decrease in the photosynthetic activity (41% of the initial value by day 4) with slow recovery after the stop treatment was stopped. A significant negative correlation was found between the photosynthetic rate and the sucrose content in the leaves given the low-temperature treatment, but no significant correlation was found between the rate and the starch content. This result indicates that the photosynthetic metabolism is more directly influenced by the amount of sucrose in the cytoplasm than by the starch content in the chloroplast when the source/sink balance is changed by low-temperature treatment to suppress root growth.

• 日本植物生理学会の論文

著者

• Kasai M

  Hirosaki Univ. Hirosaki Jpn

• Kasai Minobu

  Department Of Biofunctional Science Faculty Of Agriculture And Life Science Hirosaki University

• KAWAMURA HIROYUKI

  Department of Surgery II, Nagoya City University Medical School

• Sawada Shinichi

  Department of Biofunctional Science, Faculty of Agriculture and Life Science, Hirosaki University

• Sawada Shinichi

  Department Of Biofunctional Science Faculty Of Agriculture And Life Science Hirosaki University

• Hayakawa Takahiko

  The Research Institute For Food Science Kyoto University

• Sawada S

  Hirosaki Univ. Hirosaki Jpn

• Hayakawa Tsuyoshi

  Department of Biology, Faculty of Science, Hirosaki University

• Kawamura Hiroyuki

  Department Of Biology Faculty Of Science Hirosaki University

• Kawamura Hiroyuki

  Department Of Architecture Faculty Of Engineering Kyushu Sangyo University

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