Omics analyses in citrus reveal a possible role of RNA translation pathways and UPR regulators in the tolerance to combined drought, high irradiance and heat stress

Abstract Environmental changes derived from global warming and human activities increase the intensity frequency of stressful conditions for plants. Multiple abiotic factors acting simultaneously enhance stress pressure drastically reduce plant growth, yield, survival. Stress combination causes a specific situation that induces particular response different to sum responses individual stresses. Here, by comparing transcriptomic proteomic profiles combinations in two citrus genotypes, Carrizo citrange (Citrus sinensis × Poncirus trifoliata) Cleopatra mandarin reshni), with contrasting tolerance stresses, we revealed key triple heat stress, high irradiance drought. The this was directed regulate RNA metabolic pathways translation processes, potentially conferring an advantage respect Cleopatra. In addition, found endoplasmic reticulum as common all combined both genotypes identified accumulation groups shock proteins (HSPs), such small HSPs HSP70s, regulators unfolded protein response, BiP2 PDIL2-2, possible involved combination. Taken together, our findings provide new insights into acclimation process plants multiple combination, necessary increasing crop changing climatic conditions.