Home
Resources
Publications
The Isoleucic Acid Triad: Distinct Impacts on Plant Defense, Root Growth, and Formation of Reactive Oxygen Species

The Isoleucic Acid Triad: Distinct Impacts on Plant Defense, Root Growth, and Formation of Reactive Oxygen Species

Sibylle Bauer, Dereje W Mekonnen, Birgit Geist, Birgit Lange, Andrea Ghirardo, Wei Zhang, Anton R Schäffner

J Exp Bot. 2020 Mar 28;eraa160.

PMID: 32227083

Abstract:

Isoleucic acid (ILA ), a branched-chain amino acid-related 2-hydroxy carboxylic acid, occurs ubiquitously in plants. ILA enhances pathogen resistance and inhibits root growth of Arabidopsis thaliana. The salicylic acid (SA) glucosyltransferase UGT76B1 is able to conjugate ILA as well. Here, we investigate the role of ILA in planta and reveal a triad of distinct responses to this small molecule. ILA synergistically cooperates with SA to activate SA-responsive gene expression and resistance in a UGT76B1-dependent manner in agreement with the observed competitive ILA-dependent repression of SA glucosylation by UGT76B1. However, ILA also shows an SA-independent stress response. NBT staining and pharmacological experiments indicate that ILA induces superoxide formation of the wild type and of an SA-deficient (NahG sid2) line. In contrast, the inhibitory effect of ILA on root growth is independent of both SA and superoxide induction. These effects of ILA are specific and distinct from its isomeric compound leucic acid and from the amino acid isoleucine. Leucic acid and isoleucine do not induce expression of defense marker genes or superoxide production, whereas both compounds inhibit root growth. All three responses to ILA are also observed in Brassica napus.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP636464-A	Salicylic Acid Related Compound B		636-46-4	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: