Lectins in Arabidopsis SAR

Lectins in Arabidopsis SAR

We compared extracts from SAR signal emitting wt Arabidopsis plants to those of the non-SAR signal-emitting enhanced disease susceptibility1 mutant and identified metabolites and proteins potentially involved in SAR. Metabolites included the known SAR signaling intermediate azelaic acid (AzA; Wittek et al., 2014, J Exp Bot 65: 5919) and proteins included LEGUME LECTIN LIKE PROTEIN1 (LLP1), which is essential for SAR (Breitenbach et al., 2014, Plant Physiol 165: 791). The Arabidopsis thaliana LLP1 gene, AtLLP1, is induced both locally and systemically in SAR and appears to promote SAR in parallel with the SAR-associated phytohormone salicylic acid (SA). Ongoing work in the laboratory aims to further characterize the role of LLP1 in SAR and to place it in the growing network of SAR signaling components.