High conservation of the transcriptional response to acetolactate‐synthase‐inhibiting herbicides across plant species
2018
Délye, C | Duhoux, A | Gardin, J A C | Gouzy, J | Carrère, S
We investigated whether specific ALS‐inhibitor response marker‐genes (AIRMs) identified in the model dicotyledonous plant Arabidopsis thaliana (Brassicaceae) were conserved across phylogenetically very distant species. The most probable homologs of the 533 A. thalianaAIRMs were identified in the major monocotyledonous weeds Alopecurus myosuroides and Lolium sp. (Poaceae) using recently established transcriptome resources. Expression patterns of above 70% of the grass AIRMs homologs matched those of their A. thaliana counterparts. Pathways of response to acetolactate‐synthase (ALS)‐inhibiting herbicides seem therefore strongly conserved, even across very distant plant species. This opens new perspectives for unravelling the genetic determinants of non‐target‐site resistance (NTSR) to ALS inhibitors, especially those governing NTSR regulation that remains fully unknown to date. Model plants could be used in a first step to discover the genes involved in ALS‐inhibitor response pathways. Subsequent studies comparing sequence and expression of weed homologs of these genes should expedite the identification of candidates for the role of genes governing NTSR sensing and regulatory pathways.
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