摘要：Salinity is one of the main environmental stresses that affect plant growth and development. H2S playsan important role in a variety of responses against abiotic stresses. This study was conducted todetermine the effects of exogenous NaHS, a hydrogen sulphide (H2S) donor on physiologicalcharacteristics of Cucurbita ficifolia seedlings under NaHCO3 stress. The accumulation of chlorophyllcontent, malondialdehyde (MDA), soluble protein and soluble sugar along with the activities of superoxidedismutase (SOD) and peroxidase (POD) in leaves were estimated. NaHCO3 stress decreased thechlorophyll content, increased the accumulation of MDA, soluble protein and soluble sugar, andimproved SOD and POD activities in leaves, compared to the control. However, exogenous NaHStreatment (1.0 mmol/L) significantly increased the chlorophyll content, soluble protein and solublesugar contents, and decreased the MDA content, SOD and POD activities of NaHCO3-stressed seedlings.It is strongly suggested that NaHCO3 stress inhibits the growth of Cucurbita ficifolia seedlings, whileexogenous H2S can effectively protect Cucurbita ficifolia seedlings against NaHCO3 stress..
