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Asian Journal of Plant Sciences
  Year: 2018 | Volume: 17 | Issue: 4 | Page No.: 213-221
DOI: 10.3923/ajps.2018.213.221
Nano-titanium Dioxide-induced Synthesis of Hydrogen Sulfide and Cysteine Augment Drought Tolerance in Eruca sativa
Mohammad Nasir Khan and Fahad Mohammed Alzuaibr

Abstract:
Background and Objectives: In recent years nano-materials have emerged as an important tools in manipulating crop performance worldwide. Also hydrogen sulfide (H2S) has gained substantial attention of plant biologists. Present study was planned to investigate the effect of nano-titanium dioxide (nTiO2) on the synthesis of H2S and their role in the tolerance of Eruca sativa plants to drought stress. Materials and Methods: Three week old plants of Eruca sativa were sprayed with 20 mg L1 nTiO2 and 1 mM hypotaurine (HT, an H2S scavenger) then plants were subjected to drought stress by withholding water and nutrient supply for one week except for the control which received double distilled water (DDW) only. The treatments were given as: (1)DDW (Control), (2) nTiO2, (3) Drought stress (DS), (4) nTiO2+DS, (v) nTiO2+HT+DS. Plants treated with DDW only were considered as control. Results: Results showed that drought stress induced the generation of hydrogen peroxide (H2O2), thiobarbituric acid reactive substances (TBARS), electrolyte leakage (ELKG) and caused reduction in leaf relative water content (LRWC). At the same time drought-stressed plants also showed enhanced activities of antioxidant enzymes [superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT)] and accumulation of osmolytes [proline (Pro), glycine betaine (GB)]. Moreover, drought-stressed plants pre-treated with nTiO2 showed further enhancement in the activities of antioxidant enzymes and accumulation of osmolytes that resulted in reduced H2O2 content, TBARS, ELKG and improved LRWC. Furthermore, nTiO2 also enhanced the synthesis of H2S and cysteine. Role of H2S in drought stress tolerance was confirmed using H2S scavenger hypotaurine (HT). Conclusion: Results showed that application of HT along with nTiO2 to drought stressed pants suppressed H2S content and plants showed weak tolerance against drought stress. Therefore, these results suggest that nTiO2-induced synthesis of H2S induces drought tolerance capacity of plants through enhancing the activities of antioxidant enzymes and accumulation of osmolytes.
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How to cite this article:

Mohammad Nasir Khan and Fahad Mohammed Alzuaibr, 2018. Nano-titanium Dioxide-induced Synthesis of Hydrogen Sulfide and Cysteine Augment Drought Tolerance in Eruca sativa. Asian Journal of Plant Sciences, 17: 213-221.

DOI: 10.3923/ajps.2018.213.221

URL: https://scialert.net/abstract/?doi=ajps.2018.213.221

 
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