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Effect of benzoic acid and its hydroxy-derivatives on the carbohydrate-metabolism of starved and of sucrose-fed etiolated barley leaves

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Summary

In etiolated barley leaves benzoic acid and its hydroxy-derivatives lowered the rate of carbon dioxide output, o-hydroxybenzoic acid (OHBA) being most effective, while p-hydroxybenzoic acid (PHBA) was least. Sucrose furthered the inhibitory effects of these acids when they were administered in 0.01 M concentration, but seemed only to alleviate the effect of PHBA when the latter was present in 0.001 M concentration.

High concentrations of BA or its hydroxy-derivatives caused the excretion of hexoses, more prominently in the presence than in the absence of sucrose; OHBA being the exception, where sucrose stopped hexose-excretion. In the presence of lower concentrations BA retarded, while OHBA accelerated sucrose-uptake.

BA and its hydroxy-derivatives depleted the tissue of its sucrosecontent and lowered the polysaccharide value, whether the leaves were starved or sugar-fed.

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  1. Department of Botany, Faculty of Science, Cairo University Cairo, UAR

    M. I. Naguib

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  1. M. I. Naguib
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Naguib, M.I. Effect of benzoic acid and its hydroxy-derivatives on the carbohydrate-metabolism of starved and of sucrose-fed etiolated barley leaves. Planta 64, 20–27 (1965). https://doi.org/10.1007/BF00518618

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  • DOI: https://doi.org/10.1007/BF00518618

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