ABA and Low Temperature Induce Freezing Tolerance via Distinct Regulatory Pathways in Wheat : ENVIRONMENTAL AND STRESS RESPONSES : GENE STRUCTURE AND EXPRESSION

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概要

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• The role of ABA in the induction of freezing tolerance was investigated in two wheat (T. aestivum L.) cultivars. Glenlea (spring var) and Fredrick (winter var). Exogenous application of ABA (5 x 10^<-5> M for 5 days at 24℃) increased the freezing tolerance of intact plants by only 3℃ (LT_<50>) in both cultivars. Maximal freezing tolerance (LT_<50> Of -9℃ for Glenlea and -17℃ for Fredrick) could only be obtained with a low temperature treatment (6/2℃; day/night) for 40 days. These results show that exogenously applied ABA cannot substitute for low temperature requirement to induce freezing tolerance in intact wheat plants. Furthermore, there was no increase in the endogenous ABA level of wheat plants during low temperature acclimation, suggesting the absence of an essential role for ABA in the development of freezing tolerance in intact plants. On the other hand, ABA application (5 x 10^<-5> M for 5 days at 24℃) to embryogenic wheat calli resulted in an increase of freezing tolerance similar to that achieved by low temperature. However, as in intact plants, there was no increase in the endogenous ABA level during low temperature acclimation of calli. These results indicate that the induction of freezing tolerance by low temperature is not associated with an increase in ABA content. Using an antibody specific to a protein family associated with the development of freezing tolerance, we demonstrated that the induction of freezing tolerance by ABA in embryogenic wheat calli was correlated with the accumulation of a new 32 kDa protein. This protein is specifically induced by ABA but shares a common antigenicity with those induced by low temperature. These results suggest that ABA induces freezing tolerance in wheat calli via a regulatory mechanism different from that of low temperature.

• 日本植物生理学会の論文

著者

• Chevrier Normand

  Departement Des Sciences Biologiques Universite De Quebec A Montreal

• SARHAN Fathey

  Department des Sciences Biologiques, Universite du Quebec a Montreal

• HOUDE Mario

  Department des Sciences Biologiques, Universite du Quebec a Montreal

• Dallaire Sylvain

  Departement des Sciences Biologiques, Universite de Quebec a Montreal

• Gagne Yves

  Departement des Sciences Biologiques, Universite de Quebec a Montreal

• Saini Hargurdeep

  Institut de Recherche en Biologie Vegetale, Universite de Montreal

• Boilear Serge

  Departement des Sciences Biologiques, Universite de Quebec a Montreal

• Houde Mario

  Departement Des Sciences Biologiques Universite De Quebec A Montreal

• Sarhan Fathey

  Departement Des Sciences Biologiques Universite De Quebec A Montreal

• Sarhan Fathey

  Departement Des Saences Brologiques Universite Du Qudbec A Montreal

• Saini Hargurdeep

  Institut De Recherche En Biologie Vegetale Universite De Montreal

• Boilear Serge

  Departement Des Sciences Biologiques Universite De Quebec A Montreal

• Dallaire Sylvain

  Departement Des Sciences Biologiques Universite De Quebec A Montreal

• Gagne Yves

  Departement Des Sciences Biologiques Universite De Quebec A Montreal

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