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- W1973552263 abstract "The effects of calmodulin antagonists on indol-3-yl acetic acid (IAA) uptake by Cucurbita pepo L. hypocotyl segments have been studied. Chlorpromazine (CP) and trifluoperazine (TFP) stimulate uptake of IAA, but not in the presence of 1-naphthylphthalamic acid (NPA), which itself stimulates net IAA uptake by inhibiting the IAA efflux carrier. Maximum stimulation of IAA uptake is observed at 300 μM CP, at both pH 4.0 and 5.0, with a decrease below this maximum at 1 mM CP. CP also stimulates uptakes of abscisic acid (ABA) and 5,5-dimethyl-oxazolidine-2,4-dione (DMO) with the same concentration-dependence. Indirect evidence suggests that enhanced permeability to lipophilic molecules rather than cytoplasmic alkalinification is involved. At submaximal stimulatory concentrations, CP and NPA have apparently additive effects. However, the carrier antagonism by CP is less specific than that of NPA since it also renders the IAA uptake carrier undetectable. The local anaesthetics, dibucaine and tetracaine, and the calcium entry blocker, flunarizine, had similar effects to CP on uptake. However, only CP increased the binding of IAA (but not of ABA or DMO) to frozen-and-thawed segments. It is suggested that CP may increase membrane permeability to apolar molecules, probably non-specifically, and also interfere with auxin carrier action by hydrophobic interaction with phospholipids or membrane proteins." @default.
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- W1973552263 date "1986-01-01" @default.
- W1973552263 modified "2023-09-23" @default.
- W1973552263 title "Effects of calmodulin antagonists on transmembrane auxin transport in Cucurbita pepo L. hypocotyl segments" @default.
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- W1973552263 doi "https://doi.org/10.1016/0168-9452(86)90013-0" @default.
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