NaCl induced changes in ionically bound peroxidase activity in roots of rice seedlings |
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Authors: | Lin Chuan Chi Kao Ching Huei |
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Institution: | (1) Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China |
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Abstract: | The changes in ionically bound peroxidase activity in roots of NaCl-stressed rice seedlings and their correlation with root
growth were investigated. Increasing concentrations of NaCl from 50 to 150 mM progressively decreases root growth. The reduction
of root growth by NaCl is closely correlated with the increase in ionically bound peroxidase activity. Since proline and ammonium
accumulations are associated with root growth inhibition caused by NaCl, we determined the effects of proline or NH4Cl on
root growth and ionically bound peroxidase activity in roots. External application of proline or NH4Cl markedly inhibited
root growth and increased ionically bound peroxidase activity in roots of rice seedlings in the absence of NaCl. An increase
in ionically bound peroxidase activity in roots preceded inhibition of root growth caused by NaCl, NH4Cl or proline. Mannitol
inhibited root growth, but decreased rather than increased ionically bound peroxidase activity at the concentration iso-osmotic
with NaCl. The inhibition of root growth and the increase in ionically bound peroxidase activity in roots by NaClis reversible
and is associated with ionic rather than osmotic component.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | NaCl Oryza sativa peroxidase root growth |
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