Effects Of The Leaves Of Sasa Argenteostriatus On Seedling Growth Of Lactuca Sativa L.

Sasa argenteostriatus is a species of ground cover bamboo, which leaves showedvery strong allelopathy. In this study, effects of the leaves of Sasa argenteostriatus onseed germination and seedling growth of Lactuca sativa L were determined insubstrate culture. The aim of this work was to assess the allelopatic potential of theleaves of Sasa argenteostriatus, and to provide the theory basis for developing thebotanieal herbieide. The main results were as following:1.Effects of the leaves of Sasa argenteostriatus on germination ofLactuca sativa L.seeds.The concentration of the leaves of Sasa argenteostriatus were used in fourdegrees:0，50，100and200g/m². The results showed that all treatments（50，100,200g/m²ï¼‰ of the leaves of Sasa argenteostriatus inhibited seed germination, and theinhibition became stronger as the concentration increased. The germination of alltreatments0，50，100and200g/m²were80.0%，64.0%，59.0%and54.4%.2.Effects of the leaves of Sasa argenteostriatus on seedlings growthof Lactuca sativa L.These results showed that the inhibition of seed germination and root growth isabout12.15-28.91%with the concentration range of the leaves of Sasaargenteostriatus （50-200g/m²ï¼‰,and the inhibition became stronger as the concentrationincreased.In addition, with the concentration range of the leaves of Sasaargenteostriatus(50^-100g/m²) had stimulatory effects on the seedling length, but theconcentration treatment （200g/m²ï¼‰ had inhibitory effects.3.Effects of the leaves of Sasa argenteostriatus on seedlingschlorophyll contents of Lactuca sativa L.On the3rd,6th,9th and12th day after added the leaves of Sasa argenteostriatusinto substrate, the leaves of Sasa argenteostriatus could significant reducing effectson the chlorophyll content, especially on the chlorophyll a, and became lower as theconcentration of the leaves of Sasa argenteostriatus increased in substrate,but theleaves of Sasa argenteostriatus had slight effects on chlorophyll a in the late state.4.Effects of the leaves of Sasa argenteostriatus on seedlings SOD、 POD、CAT of Lactuca sativa L.On the6th,9th,12th and15th day after added the leaves of Sasa argenteostriatusinto substrate, the activity of SOD was significantly increased with the concentrationrange（100-200g/m²ï¼‰ of the leaves of Sasa argenteostriatus, and the highest activity ofSOD occurred on15th day,but the low concentration（50g/m²ï¼‰ of the leaves of Sasaargenteostriatus had slight stimulatory effects on the activity of SOD.On the3th,9th,12th and15th day after added the leaves of Sasa argenteostriatusinto substrate, the activity of POD was significantly increased with the allconcentration treatments（50、100、200g/m²ï¼‰ of the leaves of Sasaargenteostriatus,and the highest activity of POD occurred in the low concentrationtreatment（50g/m²ï¼‰ï¼Œthe lowest activity of POD occurred in the control.On the3th,9th,12th and15th day after added the leaves of Sasa argenteostriatusinto substrate, the activity of CAT was significantly increased with the allconcentration treatments（50、100、200g/m²ï¼‰ of the leaves of Sasa argenteostriatus,and the highest activity of CAT occurred on15th day.On the5th and10th day after added the leaves of Sasa argenteostriatus intosubstrate, the activity of MDA was increased with the all concentration treatments（50、100、200g/m²ï¼‰ of the leaves of Sasa argenteostriatus, and the highest activity ofMDA occurred in the high concentration treatment（200g/m²ï¼‰.5.Effects of the leaves of Sasa argenteostriatus on seedlingsroot activity of Lactuca sativa L.On the20th day after added the leaves of Sasa argenteostriatus into substrate,the root activity was changed. The results showed that the root activity of alltreatments0，50，100and200g/m²were59.46μg·g^-1·h^-1，63.58μg·g^-1·h^-1，34.75μg·g^-1·h^-1and33.10μg·g^-1·h^-1. The root activity was significantly inhibited withthe concentration range （100-200g/m²ï¼‰ of the leaves of Sasa argenteostriatus.