biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 27:145, 1985 | DOI: 10.1007/BF02902152

Auxin biosynthesis and its regulation on the molecular level

M. Kutáček1
1 Institute of Experimental Botany, Czechoslovak Academy of Sciences, Praha 6, Czechoslovakia

IAA synthesis proceeding by indol-3-ylpyruvate (IPyA) pathway seems to be regulated in two steps. In the first the L-trp conversion into IPyA is reduced by a low affinity of L-trp to the unspecific aminotransferase, by competition of L-trp with some aminoacids (e.g. L-asp) and indoles (e.g. indol-3-ylacetylaspartate). Simultaneously, a specific L-trp-dehydrogenase in dependence on the NAD(P)/NAD(P)H ratio regulates by its reversible effect the level of IPyA, connecting photosynthesis with growth. A second more "delicate" regulation of IAA level is carried out by the indol-3-ylacetaldehyde system. In pea plants two indol-3-ylacetaldehyde oxidases with pH optima 4.5 and 7.0 were found. The oxidases are differentially inhibited by an excess of IAA, different indoles as indol-3-ylacetylaspartate and aminoacids as L-asp. GA3 and kinetin stimulate the conversion of indol-3-ylacetaldehyde to IAA.

Published: March 1, 1985  Show citation

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Kutáček, M. (1985). Auxin biosynthesis and its regulation on the molecular level. Biologia plantarum, 27(2-3), 145. doi: 10.1007/BF02902152
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