Effects of decenylsuccinic Acid on the permeability and growth of bean roots |
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Authors: | Newman E I Kramer P J |
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Institution: | Department of Botany, Duke University, Durham, North Carolina. |
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Abstract: | Decenylsuccinic acid (DSA) at 10−3 m has been reported to increase the permeability of bean root systems to water without seriously injuring the plants. We have confirmed the increase in permeability at 10−3 m, but have found that 10−4 m DSA reduces the permeability. Both concentrations cause leakage of salts from the roots and cessation of root pressure exudation. The roots of intact bean plants are killed by 1 hour's immersion in 10−3 m DSA, but the plants may survive by producing new roots. Up to 4 hours in 10−4 m DSA causes only temporary cessation of growth. Comparisons are made between the effects of DSA and some metabolic inhibitors. It is suggested that DSA is acting as a metabolic inhibitor, and that increase in water permeability is the result of injury to the roots. Experiments with 3 other species indicated variations in response to 10−3 m DSA. These could be largely attributed to differences in susceptibility to injury. |
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