Abstract
Although melatonin has been reported to function as a stress signaling molecule, not much information is available on the biochemical and molecular events associated with probable melatonin-hydrogen sulfide crosstalk in plants. Present work provides evidence on the role of melatonin in the modulation of H2S homoeostasis during NaCl stress in dark-grown tomato (Solanum lycopersicum L. var. cherry) seedlings. NaCl stress (120 mM) inhibits hypocotyl elongation, promotes primary root growth and enhances electrolytic leakage from tomato seedlings. Treatment with H2S donor (100 µM; NaHS) tends to reverse these effects, all the more so (additive effect) in the presence of melatonin. NaCl stress and exogenous melatonin (30 µM) treatments modulate endogenous H2S accumulation and positively upregulate the activity of L-cysteine desulfhydrase (L-DES; EC 4.4.1.15; cytosolic). Melatonin has been observed to temporally modulate the activity of specific isoforms of H2S biosynthesizing enzyme, L-DES in seedling cotyledons. Zymographic analysis of L-DES isoforms in tomato seedling cotyledons has provided novel findings in plant system. Melatonin treatment decreases H2S accumulation in NaCl-stressed seedling cotyledons which is accompanied by a contrasting increase in L-DES activity. Melatonin, therefore, regulates endogenous H2S concentration in seedling cotyledons (NaCl treated), thus indicating the role of H2S catabolism pathways in H2S homoeostasis. Present findings thus reveal that exogenous melatonin modulates early H2S signaling in cotyledons of tomato seedlings subjected to NaCl stress. Furthermore, exogenous melatonin and H2S in combination (additive effect) ameliorate NaCl stress-induced growth changes in tomato seedlings.
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Abbreviations
- DMPD:
-
N, N-dimethyl-p-phenylenediamine dihydrochloride
- DTT:
-
Dithiothreitol
- EC:
-
Electrical conductivity
- EDTA:
-
Ethylenediaminetetraacetic acid
- L-DES:
-
L-cysteine desulfhydrase
- MB:
-
Methylene blue
- NaHS:
-
Sodium hydrogen sulfide
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The authors are grateful to Aditi, Archana, Mansi and Monika for their assistance in performing the experiments.
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This work was supported by UGC-ISF Joint Research Grant [Grant No. F. No. 6–9/2017 (IC)].
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Mukherjee, S., Bhatla, S.C. Exogenous Melatonin Modulates Endogenous H2S Homeostasis and L-Cysteine Desulfhydrase Activity in Salt-Stressed Tomato (Solanum lycopersicum L. var. cherry) Seedling Cotyledons. J Plant Growth Regul 40, 2502–2514 (2021). https://doi.org/10.1007/s00344-020-10261-7
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DOI: https://doi.org/10.1007/s00344-020-10261-7