Oligo-Carrageenan Kappa-Induced Reducing Redox Status and Activation of TRR-TRX System Increase the Level of Indole-3-acetic Acid, Gibberellin A3 and trans-Zeatin in Eucalyptus globulus TreesReport as inadecuate




Oligo-Carrageenan Kappa-Induced Reducing Redox Status and Activation of TRR-TRX System Increase the Level of Indole-3-acetic Acid, Gibberellin A3 and trans-Zeatin in Eucalyptus globulus Trees - Download this document for free, or read online. Document in PDF available to download.

1

Marine Biotechnology Laboratory, Faculty of Chemistry and Biology, University of Santiago of Chile, 9170022 Santiago, Chile

2

Plant Physiology and Biotechnology Laboratory, Faculty of Chemistry and Biology, University of Santiago of Chile, 9170022 Santiago, Chile





*

Author to whom correspondence should be addressed.



Abstract Eucalyptus globulus trees treated with oligo-carrageenan OC kappa showed an increase in NADPH, ascorbate and glutathione levels and activation of the thioredoxin reductase TRR-thioredoxin TRX system which enhance photosynthesis, basal metabolism and growth. In order to analyze whether the reducing redox status and the activation of thioredoxin reductase TRR-thioredoxin TRX increased the level of growth-promoting hormones, trees were treated with water control, with OC kappa, or with inhibitors of ascorbate synthesis, lycorine, glutathione synthesis, buthionine sulfoximine BSO, NADPH synthesis, CHS-828, and thioredoxin reductase activity, auranofine, and with OC kappa, and cultivated for four additional months. Eucalyptus trees treated with OC kappa showed an increase in the levels of the auxin indole 3-acetic acid IAA, gibberellin A3 GA3 and the cytokinin trans-zeatin t-Z as well as a decrease in the level of the brassinosteroid epi-brassinolide EB. In addition, treatment with lycorine, BSO, CHS-828 and auranofine inhibited the increase in IAA, GA3 and t-Z as well as the decrease in EB levels. Thus, the reducing redox status and the activation of TRR-TRX system induced by OC kappa increased the levels of IAA, GA3 and t-Z levels determining, at least in part, the stimulation of growth in Eucalyptus trees. View Full-Text

Keywords: ascorbate; Eucalyptus globulus; glutathione; growth-promoting hormones; NADPH; thioredoxins ascorbate; Eucalyptus globulus; glutathione; growth-promoting hormones; NADPH; thioredoxins





Author: Alberto González 1, Rodrigo A. Contreras 2, Gustavo Zúiga 2 and Alejandra Moenne 1,*

Source: http://mdpi.com/



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