Uptake and decarboxylation of indole-3-acetic acid during auxin-induced growth in lupin hypocotyl segments. Influence of pH and vanadate
作者： J.M. Bot�a , A. Ortuno , F. Sabater , M. Acosta , J. S�nchez-Bravo
DOI: 10.1007/BF00192534
关键词:
摘要: The elongation growth of etiolated hypocotyl segments lupin (Lupinus albus L.) was stimulated by acid pH (4.6 versus 6.5) and IAA for periods up to 4 h. After this time, the were unable grow further. In presence an optimal concentration (10 μM), increased rate but had no effect on final growth. With suboptimal (0.1 however, in a more than additive way, suggesting synergistic action between two factors. This synergism may be explained uptake decarboxylation seen at pH. These results reinforce view that effects low are not independent. Vanadate inhibited also decarboxylation. inhibitor, therefore, probably inhibits only decreasing ATPase-mediated acidification H+-dependent from apoplasm. dependence ATPase mediated apoplasmic acidification. amount decarboxylated when assay conditions favored segments, indicating could destroyed during auxin-induced
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