
Effects of H2S donor NaHS on the adaptability and antioxidant properties of Agave americana plantlets under an in vitro culture of osmotic stress
SHEN Yang, DI Jingjing, CHEN Ying, FENG Kai, LU Jinling, HU Yuchen
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2) : 121-128.
Effects of H2S donor NaHS on the adaptability and antioxidant properties of Agave americana plantlets under an in vitro culture of osmotic stress
【Objective】 Agave americana is an important crassulacean acid metabolism (CAM) plant with high economic value in tropical areas. Studying its drought adaptability could provide evidence of the drought tolerance mechanism, and support for resource development and engineering research regarding the utilization of CAM plants. 【Method】 In this study, A. americana plantlets were treated with 1.0 mmol/L NaHS (NS), 10% polyethylene glycol (PEG10), 20% PEG (PEG20), 1.0 mmol/L NaHS+10% PEG (NS+PEG10), and 1.0 mmol/L NaHS+20% PEG (NS+PEG20) under an in vitro culture. The responses to PEG osmotic stress were studied and the effects of H2S donor NaHS on osmotic regulation and antioxidant properties in A. americana were investigated. 【Result】 The results showed that the A. americana plantlets could survive under the 20% PEG (high concentration) treatment and had a degree of drought resistance. However, injury symptoms and oxidative stress reactions occurred, with the fresh mass decreasing by 16.6% in PEG20. The cell ultrastructure changed, and the malondialdehyde (MDA) and H2O2 contents increased in PEG20. Despite this, the plantlets regulated osmotic pressure and reduced the stress intensity by increasing the levels of proline and soluble sugars. In the presence of PEG, H2S donor NaHS could reduce the excessive accumulation of proline and H2O2. Furthermore, H2S could activate superoxide dismutase (SOD) and five antioxidases, and increased the glutathione (GSH) content to clear active oxygen species (ROS) and active carbonyl compounds, subsequently enhancing the antioxidant capacity. 【Conclusion】 The A. americana plantlets had a certain degree of drought tolerance. The H2S had an important role in osmotic regulation and regulating antioxidant levels, making the plantlets better adapted to drought conditions.
Agave americana / osmotic stress / H2S / drought resistance / osmotic regulation / oxidation resistance
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