Structure-activity differences between indoleacetic acid auxins on pea and wheat

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Abstract

A series of halogenated indoleacetic acids was assessed for auxin activity on pea stem and wheat coleoptile sections. Activity differences between the two species were found. These are discussed, in terms of differences in receptor models for pea and wheat, with the models differing in the areas covered by the 6- and 7-substituted compounds.

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Cited by (42)

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    Citation Excerpt :

    The initial idea of these studies was to find possible correlations between biological activity and characteristic data of the various potential energy surfaces. In general, there is no such correlation: chlorination or ethylation at positions 5, 6, or 7 (cf. Fig. 1) has only marginal effect upon the reaction paths and potential barriers [22,23], whereas the biological activity is spread in a wide range for these compounds [10–19]. However, substitution at position 4 turned out to significantly influence the shape of the potential energy surface (PES).

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Part 3 in the series “Auxins”. For Part2, see ref. [8].

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