SRA

Purpose: High carbonate and bicarbonate concentrations of calcareous soils with high pH can affect crop performance due to different constraints. The goal of this study is to perform a comparative transcriptomic analysis using demes moderate-tolerance and sensitive under alkaline stress ( high pH 8.3 and 10 mM NaHCO3) Methods: Transcriptomic analysis was performed on two naturally selected Arabidopsis thaliana demes. Carbon soil tolerant A1(c+) and the sensitive T6(c-). Plants 15 day-old were exposed for 3 or 48 h to either pH stress alone (pH 5.9 vs pH 8.3 adjusted by BTP and MES buffers) or to alkaline stress (pH 8.3) caused by 10 mM of Results Shoot transcriptome analysis revealed that bicarbonate quickly (3 h) induced Fe-deficiency related genes in T6(c-) leaves, while in A1 (c+) main initial changes were found in receptor-like proteins (RPL), jasmonate (JA) and salicylate (SA) pathways, methionine-derived glucosinolate (GS), Sulphur starvation, starch degradation, and cell cycle. Conclusions: Our results suggest that leaves of carbonate tolerant plants do not sense iron deficiency as fast as sensitive ones. This is in line with the ability to translocate more iron to aerial parts, producing a higher biomass and maintaining silique production. In leaves of A1(c+) plants, the activation of other genes related to apoplastic stress perception, signal transduction, GS, sulphur acquisition, and cell cycle regu-lation precedes the induction of iron homeostasis mechanisms yielding an efficient response to bicarbonate stress Overall design: Plant mRNA profile from 15-day old plant subjected in 3 hours and 48 under treatment. 3 technical replicate from 2 biological replicate.