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Background  We previously reported the involvement of nitric oxide (NO) and cyclic nucleotide-gated ion channel 6 (CNGC6) in the responses of plants to heat shock (HS) exposure. To elucidate their relationship with heat tolerance in  Arabidopsis thaliana , we examined the effects of HS on several groups of seedlings: wild type,  cngc6 , and  cngc6  complementation and overexpression lines.    Results  After HS exposure, the level of NO was lower in  cngc6  seedlings than in wild-type seedlings but significantly elevated in the transgenic lines depending on  CNGC6  expression level. The treatment of seeds with calcium ions (Ca 2+ ) enhanced the NO level in Arabidopsis seedlings under HS conditions, whereas treatment with EGTA (a Ca 2+  chelator) reduced it, implicating that CNGC6 stimulates the accumulation of NO depending on an increase in cytosolic Ca 2+  ([Ca 2+ ] cyt ). This idea was proved by phenotypic observations and thermotolerance testing of transgenic plants overexpressing NIA2 and NOA1, respectively, in a  cngc6  background. Western blotting indicated that CNGC6 stimulated the accumulation of HS proteins via NO.    Conclusion  These data indicate that CNGC6 acts upstream of NO in the HS pathway, which improves our insufficient knowledge of the initiation of plant responses to high temerature.    Electronic supplementary material  The online version of this article (10.1186/s12870-019-1974-9) contains supplementary material, which is available to authorized users.

bmc plant biology

Cyclic nucleotide-gated ion channel 6 mediates thermotolerance in Arabidopsis seedlings by regulating nitric oxide production via cytosolic calcium ions