Abstract
Calcium (Ca2+)/calmodulin (CaM), a core component of calcium messenger system, is a multiple second messenger that is involved in multiple stress tolerance including heat tolerance in plants, hydrogen sulfide (H2S) is fast emerging similar functions, but Ca2+ and H2S crosstalk in the acquisition of thermotolerance is not completely understood. In this article, Ca2+ and CaM activated the activity of cysteine desulfhydrase (L-DES), followed by inducing endogenous H2S accumulation in tobacco suspension cultured cells, while treatment with Ca2+ chelator ethylene glycol-bis(b-aminoethylether)-N,N,N′,N′-tetraacetic acid and CaM antagonists chlorpromazine lowered L-DES activity and H2S accumulation. Interestingly, Ca2+- and CaM-activated L-DES activity and endogenous H2S accumulation were eliminated by H2S synthesis inhibitors DL-propargylglycine (PAG), aminooxy acetic acid (AOA), potassium pyruvate (PP) and hydroxylamine (HA), and the H2S scavenger hypotaurine (HT), indicating that Ca2+ and CaM regulated endogenous H2S generation via activating L-DES activity in tobacco cells. Furthermore, H2S donor NaHS, Ca2+ and CaM treatment alone significantly improved the thermotolerance of tobacco cells, and heat tolerance induced by Ca2+ and CaM was enhanced by exogenous NaHS, while weakened by PAG, AOA, PP, HA or HT. All above-mentioned results suggest that endogenous H2S generated by L-DES was involved, at least partly, in the thermotolerance induced by Ca2+ and CaM in tobacco suspension cell cultures.
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Abbreviations
- AOA:
-
Aminooxy acetic acid
- CaM:
-
Calmodulin
- CPZ:
-
Chlorpromazine
- CS:
-
Cysteine synthase
- L-DES:
-
L-cysteine desulfhydrase
- ECS:
-
Extracellular calcium stores
- EGTA:
-
Ethylene glycol-bis(b-aminoethylether)-N,N,N′,N′-tetraacetic acid
- HA:
-
Hydroxylamine
- H2S:
-
Hydrogen sulfide
- HT:
-
Hypotaurine
- ICS:
-
Intracellular calcium stores
- NaHS:
-
Sodium hydrosulfide
- PAG:
-
DL-propargylglycine
- PP:
-
Potassium pyruvate
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This work was financially supported by National Natural Science Foundation of China (31360057 to Zhong-Guang Li).
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Li, ZG., Long, WB., Yang, SZ. et al. Endogenous hydrogen sulfide regulated by calcium is involved in thermotolerance in tobacco Nicotiana tabacum L. suspension cell cultures. Acta Physiol Plant 37, 219 (2015). https://doi.org/10.1007/s11738-015-1971-z
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DOI: https://doi.org/10.1007/s11738-015-1971-z