Effects of temperature on the cell wall and osmotic properties in dark-grown rice and azuki bean seedlings |
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Authors: | Nakamura Yukiko Wakabayashi Kazuyuki Kamisaka Seiichiro Hoson Takayuki |
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Institution: | (1) Department of Biological Sciences, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan,;(2) Department of Biology, Faculty of Science, Toyama University, Gofuku, Toyama, Japan, |
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Abstract: | The mechanism inducing the difference in growth rate under various temperature (10–50 °C) conditions was analyzed using rice
and azuki bean seedlings. The growth rate of rice coleoptiles and azuki bean epicotyls increased as temperature increased
up to 40 and 30 °C, respectively, and the elongation was retarded at a higher temperature. The cell wall extensibility of
rice coleoptiles and azuki bean epicotyls also showed the highest value at 40 and 30 °C, respectively, and became smaller
as the temperature rose or dropped from the optimum. The opposite tendency was observed in the minimum stress-relaxation time
of the cell wall. On the other hand, the cellular osmotic concentration of rice coleoptiles and azuki bean epicotyls was lower
at the temperature optimum for growth at 40 and 30 °C, respectively. When rice and azuki bean seedlings grown at 10, 20, 40,
or 50 °C were transferred to the initial temperature (30 °C), the growth rate of coleoptiles and epicotyls was mostly elevated,
concomitant with an increase in the cell wall extensibility. The growth rate was correlated with the cell wall mechanical
parameters in both materials. These results suggest that the environmental temperature modulates the growth rate of plant
shoots by affecting mainly the mechanical properties of the cell wall.
Electronic Publication |
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Keywords: | Azuki bean Coleoptile Epicotyl Growth rate Oryza sativa cv Koshihikari Rice Vigna angularis cv Takara |
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