Contribution of putrescine degradation to proline accumulation in soybean leaves under salinity |
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Authors: | G X Su X Bai |
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Institution: | (1) College of Life Sciences, Soochow University, Suzhou, 215123, P.R. China |
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Abstract: | Proline accumulation was studied in the leaves of Glycine max (L.) Merr. subjected to salt stress in the presence of aminoguanidine (AG, a specific inhibitor of diamine oxidase, DAO)
and exogenous putrescine (Put). Both DAO activity and proline content were increased while endogenous Put content was decreased
in soybean leaves under 50 to 150 mM NaCl. There was a negative correlation between proline accumulation and endogenous Put
content. The addition of AG during NaCl stress inhibited DAO activity, caused Put accumulation and a 15 to 20 % decrease in
proline content. Application of 1 mM Put to NaCl solution markedly increased proline content. The promotive effect of Put
application could be alleviated by the treatment with Put plus AG. Moreover an application of AG had no effect on proline
accumulation in soybean seedlings grown under normal condition. These results indicate that the quantitative contribution
of Put degradation to proline formation is 15 to 20 %. |
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Keywords: | Additional" target="_blank">Additional Glycine max NaCl-induced stress polyamine degradation |
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