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• W62171806 abstract "Abstract Translocation and metabolism of 14C-labeled phenoxyacetic acid and six analogues in soybeans were evaluated following applications at three different sites; primary leaf, cotyledon, and epicotyl. The most phloem-mobile compounds were 4CPOA (4-chlorophenoxy) acetic acid and 4FPOA (4-fluorophenoxy) acetic acid. Three common plant growth regulators, 245T (2, 4, 5-trichlorophenoxy) acetic acid, 24D (2, 4-dichlorophenoxy) acetic acid, and MCPA (2-methyl-4-chlorophenoxy) acetic acid showed less mobility than 4CPOA (4-chlorophenoxy) acetic acid. No significant phloem transport occurred with 2CPOA (2-chlorophenoxy) acetic acid and POA (phenoxyacetic acid). Transport and metabolism data showed that 4FPOA was most resistant to metabolic breakdown; 79.6% of the parent acid remained after 2 days. Second in stability was 245T with 68.1% parent acid remaining. Similar values found for 4CPOA and 24D were 63.4% and 59.4%, respectively. Two-thirds of the MCPA was degraded. Applications of 2CPOA and POA to primary leaves or cotyledons resulted in almost complete metabolic degradation. Mono- para substitutions were the most phloem-mobile molecular configurations. The potent plant growth regulators-24D, 245T and MCPA showed less phloem mobility. We conclude that if the phenoxy ring contains no substitution (POA) or the substitution is in the ortho position (2CPOA), hormone activity is very weak and no phloem transport occurs. The factor which accounted for the difference between phloem transport of 4CPOA or 4FPOA and the hormone-type compounds is binding to receptor protein. Bound hormones may be less available for long distance transport. Phloem mobility of these acids did not correlate with water solubility, pKa, or partition coefficient. Mono- para -halo substituted phenoxyacetic acids (e.g., 4CPOA) appear to be more phloem mobile because they are not inactivated at the source, in the transport path, or at the sinks either by rapid and extensive in vivo degradation or by binding to plant growth regulator receptor proteins." @default.
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• W62171806 date "1983-01-01" @default.
• W62171806 modified "2023-09-27" @default.
• W62171806 title "EFFECT OF RING SUBSTITUENTS ON PHLOEM TRANSPORT AND METABOLISM OF PHENOXYACETIC ACID AND SIX ANALOGUES IN SOYBEAN [GLYCINE MAX]" @default.
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• W62171806 doi "https://doi.org/10.1016/b978-0-08-029222-9.50033-0" @default.
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