Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 191, Issue -, Pages 63-72Publisher
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2015.11.012
Keywords
Auxin conjugate; Indole-3-acetyTaspartate; Salt stress; Heavy metal stress; Ascorbate peroxidase; Guaiacol peroxidase; Catalase; Protein carbonylation; P. sativum
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Funding
- Nicolaus Copernicus University Grant [1935-B]
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The synthesis of IAA-amino acid conjugates is one of the crucial regulatory mechanisms for the control of auxin activity during physiological and pathophysiological responses. Indole-3-acetyl-aspartate (IAA-Asp) is a low molecular weight amide conjugate that predominates in pea (Pisum sativum L.) tissues. IAA-Asp acts as an intermediate during the auxin degradation pathway. However, some recent investigations suggest a direct signaling function of this conjugate in various processes. In this study, we examine the effect of 100 mu M IAA-Asp alone and in combination with salt stress (160 mM NaC1) or heavy metal stress (250 0/1 CdC12) on H2O2 concentration, protein carbonylation as well as catalase and ascorbate (APX) and guaiacol peroxidase (GPX) activities in 7-day-old pea seedlings. As revealed by spectrophotometric analyses, IAA-Asp increased the carbonylated protein level and reduced the H202 concentration. Moreover, IAA-aspartate potentiated the effect of both Cd(2+)ions and NaC1 on the H202 level. The enzymatic activities (catalase and peroxidases) were examined using spectrophotometric and native-PAGE assays. IAA-Asp alone did not affect catalase activity, whereas the two peroxidases were regulated differently. IAA-Asp reduced the APX activity during 48 h cultivation. APX activity was potentiated by IAA-Asp + NaC1 after 48 h. Guaiacol peroxidase activity was diminished by all tested compounds. Based on these results, we suggest that IAA-Asp can directly and specifically affect the pea responses to abiotic stress. (C) 2015 Elsevier GmbH. All rights reserved.
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