Effects of Sodium Hydrosulfide on the Senescence and Physiological Characteristics of Garlic
The effects of exogenous hydrogen sulfides on the senescence and physiological and biochemical characteristics of garlic leaf were studied.The results showed that the root activity and chlorophyll content of garlic leaf kept higher by different concentrations(0,100,500,1 000,1 500 μmol/L)of NaHS treatment,especially under the 500 μmol/L treatment.Hydrogen sulfides treatment significantly increased activities of SOD,POD,CAT and APX,which was conducive to scavenging reactive oxygen species of garlic leaf,and reduced the damage to cell membrane of garlic leaf.The results of the primary performance were also exhibited in lower electrolyte leakage rate,MDA content and higher free water content of garlic leaf compared with the control.So the senescence of garlic was delayed.Treatment of high concentration H2S intensified its senescence