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Gibberellic acid-induced changes in glutathione metabolism and anthocyanin content in plant tissue

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Abstract

Literature data point to a possible link between gibberellic acid (GA3) and glutathione metabolism in plant tissue, as both are connected to dormancy breakage. In order to study the influence of GA3 on glutathione metabolism, we treated an anthocyanin accumulating cell culture of periwinkle (Catharanthus roseus) and a shoot differentiated culture of pea (Pisum sativum) with GA3. Glutathione reductase (GR; E.C. 1.6.4.2) activity increased to 135% and 190% of the control in C. roseus and P. sativum, respectively. The level of oxidized glutathione (GSSG) decreased to 60% of the control in the C. roseus culture while no change in GSSG was observed in the P. sativum culture. No changes in the tissue concentration of total glutathione was observed in the cultures after GA3 treatment. Concomitant to the changes in GSSG and GR, an increase in anthocyanin accumulation was observed in the C. roseus culture in association with a strong increase in phenylalanine ammonia-lyase (PAL; E.C. 4.3.1.5) activity in response to GA3. These data strongly suggest a link between GA3 and glutathione metabolism.

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Authors and Affiliations

  1. Department of Biotechnology, Royal Institute of Technology, SE-100 44, Stockholm, Sweden

    Anna B. Ohlsson & Torkel Berglund

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  1. Anna B. Ohlsson
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  2. Torkel Berglund
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Correspondence to Anna B. Ohlsson.

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Ohlsson, A.B., Berglund, T. Gibberellic acid-induced changes in glutathione metabolism and anthocyanin content in plant tissue. Plant Cell, Tissue and Organ Culture 64, 77–80 (2001). https://doi.org/10.1023/A:1010687811222

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