Elevated indole-3-acetic acid peroxidase activity is involved in the cadmium-induced hydrogen peroxide production in barley root tip |
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Authors: | L’ubica Halušková Katarína Valentovičová Jana Huttová Igor Mistrík Ladislav Tamás |
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Institution: | 1.Department of Plant Physiology, Institute of Botany,Slovak Academy of Sciences,Bratislava,Slovak Republic |
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Abstract: | All of the analyzed heavy metals significantly inhibited root growth, but in addition to Cd exposure an elevated IAA-POD activity
was detected under Co, Cu and Hg treatment, while Ni and Pb inhibited its activity. The Cd-induced IAA-POD activity increased
from the root apex towards to the mature region of root tips. However similar or even more severe root growth inhibition was
observed by exogenously applied IAA, IAA-POD activity was activated only at high IAA concentrations. Elevated Cd-induced H2O2 production was detected both in the absence or in the presence of IAA in the reaction mixture, but in the case of IAA as
a possible substrate for PODs the production of H2O2 increased markedly just in the Cd-treated roots. Exogenously applied H2O2 also activated IAA-POD activity. Our results indicated that in the development of Cd toxicity syndrome the production of
ROS during IAA degradation by elevated IAA-POD activity plays a crucial role, mainly under severe Cd stress. |
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