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KMID : 0368419890320040323
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Journal of Plant Biology
1989 Volume.32 No. 4 p.323 ~ p.330
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Effect of Endogenous IAA Transport on Adventitious Root Formation in Phaseolus vulgaris Hypocotyl Cuttings
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Cho Duck-Yee
Soh Woong-Young
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Abstract
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This work was carried out to elucidate effects of endogenous and exogenous IAA transport on adventitious root formation in Phaseolus vulgaris hypocotyl cuttings. For inverted or normal incubation in distilled water, the adventitious root is always formed at the morphological base, but not at the morphological apex. For inverted incubation, in both distilled water and certain chemical solution, the root formation is retarded more at the first stage (0-24 hr) than at the second stage (24-48 hr). When p-chlorophenoxyisobutyric acid (PCIB) was applied to the cuttings at the first stage, the root formation was inhibited more than at the second stage. Treatment of 2,3,5-triiodobenzoic acid (TIBA) markedly inhibited the adventitious root formation in Phaseolus vulgaris hypocotyl cuttings. This inhibition influenced the root according to the applied stage and period. Therefore, the root formation is more related to the stage of root primordium formation than to the stage of root elongation from the primordium. Inhibition of auxin transport or action by TIBA or PCIB could also be reversed when hypocotyl cuttings are incubated in exogenously applied IAA solution.
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