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- W1983497205 abstract "Treatment of etiolated seedlings of barley (Hordeum vulgare) and soybean (Glycine max) with 1 millimolar 2,4-dichlorophenoxyacetic acid (2,4-D) resulted in a 14-fold and greater than 100-fold increase in ethylene production, respectively. Simultaneous monitoring of endogenous cyanide and beta-cyanoalanine synthase (beta-CAS) (EC 4.4. 1.9) activity was also performed. Endogenous levels of cyanide did not change in barley. In soybean, endogenous cyanide increased within 3 hours, increased again 6 hours after exposure to 2,4-D, and continued to increase throughout the experimental period. The activity of beta-CAS increased in both barley and soybean 9 hours after herbicide treatment. The increase in cyanide preceded the increase in beta-CAS activity by 3 to 6 hours in soybean. The steady-state concentration of endogenous cyanide in soybean was 1 micromolar, based on rates of ethylene production and cyanide metabolism by beta-CAS. This agreed with the determination of endogenous cyanide by both distillation and isotope dilution. Given the apparent compartmentalization of beta-CAS in mitochondria and the localization of ethylene/HCN production at the plasmalemma and/or tonoplast, our results suggest that extra-mitochondrial accumulation of cyanide in the cytoplasm may occur. If so, the activity of cyanide-sensitive cytoplasmic enzymes could be adversely affected, thus possibly contributing to the toxicity of 2,4-D." @default.
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- W1983497205 title "Effect of 2,4-Dichlorophenoxyacetic Acid on Endogenous Cyanide, β-Cyanoalanine Synthase Activity, and Ethylene Evolution in Seedlings of Soybean and Barley" @default.
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- W1983497205 doi "https://doi.org/10.1104/pp.94.3.1143" @default.
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