Light and Hormone Interaction in Apical Dominance in Phaseolus vulgaris L. |
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Authors: | JACKSON, D. I. FIELD, R. J. |
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Affiliation: | Lincoln College Canterbury, New Zealand |
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Abstract: | Gibberellic acid (GA2), kinetin, and indole-3yl-acetic acid(IAA) each at four concentrations (0, 0.5, 5, and 50 µM)were applied alone and in all possible combinations to rootsof Phaseolus vulgaris L. grown under four different light regimes(7000, 14 000, 21 000, and 28 000 lx). GA3 increased growthof main stem and laterals but reduced apical dominance, especiallyin the absence of, or at low kinetin concentrations. A highlevel of kinetin lowered GA3 induced growth of main stems and,to a lesser extent, laterals. Kinetin greatly reduced apicaldominance, especially in the absence of, or at low GA3 concentrations.IAA slightly reduced growth of main stems and laterals and slightlyincreased apical dominance. Generally the magnitude of the IAAeffects were less than those of GA3 or kinetin and there wereless interaction between IAA and other factors than betweenGA3 or kinetin and other factors. Light affected growth of bothmain stem and laterals but the effect was dependent on GA3 andkinetin levels and the interactions were complex. Generallya hormone balance seems to be operative with gibberellin-promotinggrowth of main stem and laterals and cytokinins and possiblyauxins preventing excessive elongation. Differential responsesbetween main stem and lateral may be due to different localhormone concentrations and over-all responses may be temperedby light intensity. |
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