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- W1974597280 abstract "The effects of indole-3-acetic acid (IAA) and p-chlorophenoxyisobutyric acid (PCIB) on rates of abscission layer formation and abscission were investigated. The primary leaves of Phaseolus vulgaris were used as test material. Treatment at the distal end of one petiole of the pair from debladed primary leaves with 1% IAA inhibited the abscission of that petiole and accelerated the abscission of its opposite untreated partner. PCIB applied simultaneously with IAA counteracted the accelerating effect of IAA on the opposite untreated petiole. This influence increased with increasing concentrations of PCIB. Anatomical studies revealed that PCIB, although it counteracted the effect of IAA on the rate of abscission, had no effect on abscission layer formation. In other words abscission layer formation takes place under the influence of the auxin despite the presence of the antiauxin. The centripetal sequence of abscission layer formation was found in all cases. SINCE APPLIED antiauxinis have been shown to compete with auxins for active sites in the cell (.McRae and Bonnier, 1953), a reasoniable assumption is that they accelerate abscissioin. This assumption has received some experimental support. Triiodobenzoic acid (TIBA), a compound that may loosely be termed an antiauxini, wheni applied to the intact apical bud accelerates internode abscission in kidney bean (Weintraub et al., 1952). They reported that other halogen-substituted benizoic acids acted in the same manner but were less effective than TIBA. Furthermore, they found that the acceleration of abscission in all inistances could be counteracted by simultaneous application of IAA. Transcinnamic acid (Hall, 1952) and maleimides (Overbeek, Blondeau and Horne, 1955), compounds demonstrating some of the characteristics of antiauxins, have been shown to accelerate the abscission of petioles of debladed leaves of cotton and peach respectively. In the lpresent study the effects of the antiauxin p-chlorophenoxy-isobutyric acid (PCIB) and IAA, alone and in combination, on the abscission of petioles of debladed leaves of Phaseolus vulgaris L., were investigated. The anitiauxin effects of PCIB were first described by Burstrom (1950) in a study of the growth anid metabolism of wheat roots. In more recent studies PCIB was found to" @default.
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- W1974597280 date "1966-02-01" @default.
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- W1974597280 title "EFFECTS OF INDOLE-3-ACETIC ACID AND PARACHLOROPHENOXY-ISOBUTYRIC ACID ON ABSCISSION IN PETIOLES OF DEBLADED LEAVES OF PHASEOLUS VULGARIS" @default.
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- W1974597280 doi "https://doi.org/10.1002/j.1537-2197.1966.tb07309.x" @default.
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