In vivo and in vitro protective role of proline

Accumulation of proline in response to environmental stresses seems tobe widespread among plants. To elucidate the role of proline in plantresponses,in vivo and in vitro, we studied theeffect of proline on catalase (CAT; EC 1.11.1.6), peroxidase (POD; EC 1.11.1.7)and polyphenol oxidase (PPO; EC 1.14...

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Bibliographic Details
Published in:Plant growth regulation 2002-11, Vol.38 (3), p.259-264
Main Authors: ÖZTÜRK, Lokman, DEMIR, Yavuz
Format: Article
Language:English
Subjects:
Biological and medical sciences
Environmental conditions
Environmental stress
Enzymatic activity
Enzymes
Fundamental and applied biological sciences. Psychology
Metabolism
Metabolism. Physicochemical requirements
Plant physiology and development
Sodium chloride
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Summary:Accumulation of proline in response to environmental stresses seems tobe widespread among plants. To elucidate the role of proline in plantresponses,in vivo and in vitro, we studied theeffect of proline on catalase (CAT; EC 1.11.1.6), peroxidase (POD; EC 1.11.1.7)and polyphenol oxidase (PPO; EC 1.14.18.1). In vivo, thesethree enzymes were activated by proline, while CAT and POD were activated andPPO was inactivated by NaCl. In vitro, CAT and POD wereactivated and PPO was inactivated by proline. Proline appeared to protect thesethree enzyme activities. The significance of these findings with regard toenvironmental stress-induced proline accumulation in vivois discussed. The ability of proline to activate the enzymes may suggest alimited conformational change. These results are important for characterisationof metabolic responses to environmental stresses and can be used as a stressindicator.[PUBLICATION ABSTRACT]
ISSN:0167-6903
1573-5087
DOI:10.1023/A:1021579713832