Interaction of free indole-3-acetic acid and its amino acid conjugates in tomato hypocotyl cultures |
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Authors: | Volker Magnus Roger P Hangarter Norman E Good |
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Institution: | (1) Rudjer Bo kovi Institute, P.O. Box 1016, HR-41001 Zagreb, Croatia;(2) Department of Plant Biology, Ohio State University, 1735 Neil Avenue, 43210-1293 Columbus, Ohio, USA;(3) Department of Botany and Plant Pathology, Michigan State University, 48824-1312 East Lansing, Michigan, USA |
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Abstract: | The interaction of free IAA and its amino acid conjugates on growth and development of cultured tomato hypocotyl tissue (Lycopersicon esculentum Mill. cv. Marglobe) was studied. In a nutrient medium containing 10 mol/L of benzyladenine, free IAA stimulated shoot and root development with little callus proliferation. In contrast, all IAA-amino acid conjugates tested supported mostly callus growth. Simultaneous application of free IAA and its conjugates resulted in the expression of mixed morphogenetic responses (i.e., both vigorous callus growth and organogenesis resulted). Growth kinetics and the effect of temporal exposure of the tissues to the bound and the free auxin suggest that some IAA-amino acid conjugates may specifically influence plant morphogenesis in ways that cannot be easily explained as simply a function of their slow hydrolysis to release free IAA.Abbreviations IAA
indole-3-acetic acid
- IAA-Ala
N-(indol-3-ylacetyl)-l-alanine
- IAA-Asp
N-(indol-3-ylacetyl)-dl-aspartic acid
- IAA-Lys
N
-(indol-3-ylacetyl)-l-lysine
- IAA-Orn
N
-(indol-3-ylacetyl)-l-ornithine
- IAA-Thr
N-(indol-3-yla etyl)-l-threonine |
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