GA_3 and Proline Promote Germination of Wheat Seeds by Stimulating α-Amylase at Unfavorable Temperatures

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概要

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• The effects of various constant temperatures(4, 9, 14, 19, 24, 29, 34, and 38℃)on the germination of winter wheat seed(Triticum aestivum L.cv.'Koyuki')in a dark condition were studied. The maximum germinatin percentage was 98% at 24℃. The speed of germination was fastest at 29℃. These results indicate that the most suitable temperature for germination was in the range of 24 to 29℃. α-Amylase expression during germination was also high at higher temperature, and maximum expression occurred at 29℃, although a high temperature of 38℃ prevented the synthesis of α-amylase. The close correlation between germination and α-amylase activity at various temperatures indicates that α-amylase is an essential factor for the temperature-dependent germination of wheat seed. In contrast, accumulation of proline increased at a lower temperature, and was the highest at 4℃. We also studied the effects of gibberellin(GA_3) and proline, a compatible osmotica in alleviating the effect of low and high temperature stresses. Pre-soaking treatment with GA_3 and proline was effective in promoting germination and increasing α-amylase expression at a low(4℃)and high(38℃)temperature. These results suggest that GA_3 and proline exhibit positive effects on stress alleviation through the stimulation of α-amylase expression.

• 日本作物学会の論文

著者

• Mitsui Toshiaki

  Graduate School Of Science And Technology Niigata University

• Mitsui Toshiaki

  Graduate School Of Natural Science And Technology Niigata University

• Ikeda Takeshi

  Graduate School of Engineering, Fukui University

• Sultana Nilufa

  Graduate School of Science and Technology, Niigata University

• Sultana Nilufa

  Graduate School Of Science And Technology Niigata University

• Ikeda Takeshi

  Graduate School Of Engineering Fukui University

• Ikeda Takeshi

  Graduate School Of Science And Technology Niigata University

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