title: NPR1-dependent salicylic acid signaling is not involved in elevated CO2-induced heat stress tolerance in Arabidopsis thaliana.
abstract: Elevated CO2 can protect plants from heat stress (HS); however, the underlying mechanisms are largely unknown. Here, we used a set of Arabidopsis mutants such as salicylic acid (SA) signaling mutants nonexpressor of pathogenesis-related gene 1 (npr1-1 and npr1-5) and heat-shock proteins (HSPs) mutants (hsp21 and hsp70-1) to understand the requirement of SA signaling and HSPs in elevated CO2-induced HS tolerance. Under ambient CO2 (380 µmol mol(-1)) conditions, HS (42°C, 24 h) drastically decreased maximum photochemical efficiency of PSII (Fv/Fm) in all studied plant groups. Enrichment of CO2 (800 µmol mol(-1)) with HS remarkably increased the Fv/Fm value in all plant groups except hsp70-1, indicating that NPR1-dependent SA signaling is not involved in the elevated CO2-induced HS tolerance. These results also suggest an essentiality of HSP70-1, but not HSP21 in elevated CO2-induced HS mitigation.
authors: a Tea Research Insititute; Chinese Academy of Agricultural Science ; Hangzhou , China.
authors: Golam Jalal
authors: GJ
authors: Ahammed
authors: Xin
authors: X
authors: Li
authors: Jingquan
authors: J
authors: Yu
authors: Kai
authors: K
authors: Shi
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D002245:Carbon Dioxide / Q000494:pharmacology*; D018869:Heat-Shock Response / Q000187:drug effects*; D055668:Photochemical Processes / Q000187:drug effects; D045332:Photosystem II Protein Complex / Q000378:metabolism; D020156:Salicylic Acid / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects*; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D029681:Arabidopsis Proteins; C105496:NPR1 protein, Arabidopsis; D045332:Photosystem II Protein Complex; D002245:Carbon Dioxide; D020156:Salicylic Acid
keywords: ABA; Arabidopsis; PSII; photosystems II; SA; abscisic acid; Fv/Fm; elevated carbon dioxide; heat stress; heat stress; HSPs; heat-shock proteins; heat-shock proteins; MAPK; maximum photochemical efficiency of PSII; HS; mitogen activated protein kinase; npr1; nonexpressor of pathogenesis-related gene 1; photochemical efficiency of PSII; salicylic acid; salicylic acid.