Study On The Physiology And Biochemistry Of Gymnema Sylvestre (Retz)schult Under Different Soil Water Contents

Gymnema sylvestre (Retz)schult belong to the plant of Asclepiadaceae and G. sylvestre genus. The study carry through potted plant, adopt mainly the portable LI-6400 photosynthesis determining system(Li-Cor Inc.,USA)and the determining method on physiology and biochemistry ,carry the study on the physiology and ecology, the physiology and biochemistry of G. sylvestre under different soil water contents. The result were as follows:1.The growing of G.sylvestret (1).The scope of soil water conents on best growing of is 8.023%-32.329%.(2). The scope of soil water conents on natual growing of G. sylvestre (Retz)schult is over7.394%. 2. The light response of photosynthesis. (1).The most photosynthesis speed of G.sylvestret Under intimidation is far the speed of G.sylvestret under normality,the capacity of photosynthesis of G.sylvestre under normality is stronger than the capacity of photosynthesis of G.sylvestre under Intimidation.(2). The respiratory speed of G.sylvestre under intimidation is lower than the respiratory speed of G.sylvestre under normality,this shows the physiology activity of G.sylvestre under Intimidation is not hearty.(3)Through comparing the light saturation point and the compesation point of Gymnema sylvestre (Retz)schul under normality and intimidation, under Intimidation, the compesation point of G.sylvestre is augmentable, the light saturation point of Gymnema sylvestre (Retz)schul is depressed.2.The effect of intension of illumination to the speed of transpiration the light saturation point of speed of transpiration of Gymnema sylvestre (Retz)schul under Intimidation is lower than the light saturation point of speed of transpiration of Gymnema sylvestre (Retz)schul under normality,the most speed of transpiration of Gymnema sylvestre (Retz)schul under Intimidation is far lower than the most speed of transpiration of Gymnema sylvestre (Retz)schul under normality.3. Water use efficiency (WUE) the light saturation point of water use efficiency is lower, is about 600umol/ m2·s,this is usually the PAR at eight-nine hour in the morning and at four-five hour in the afternoon,therefore,these time in the morning and in the afternoon is most high of water use efficiency of Gymnema sylvestre (Retz)schul.4.The index on chlorophyl fluorescence ,physiology and biochemistry (1)From comparison to disposal III, Fm/F0,Fv/F0 of chlorophyl fluorescence ,the content of proline increase with the reducibility of water content in the soil,but increases unconspicuously, fall short of degree of conspicuous difference, disposal III reach highest. from disposal III to disposal I, Fm/F0,Fv/F0 of chlorophyl fluorescence ,the content of proline declines with the reducibility of water content in the soil,besides, declines obviously, attain to degree of obvious difference ,disposal I reach lowest value. From comparison to disposal III,the latent livingness in PSII,the efficiency of photochemistry in PSII, the quanta yield of photochemistry in PSII , transform efficiency on light- energy in PSII reaction center or call most transform efficiency on light- energy in PSII increases with the reducibility of water content in the soil ,but increases unconspicuously, disposal III reach most high . from disposal III to disposal I,The latent livingness in PSII,the efficiency of photochemistry in PSII, the quanta yield of photochemistry in PSII , transform efficiency on light- energy in PSII reaction center or call most transform efficiency on light- energy in PSII declines with the reducibility of water content in the soil water content , declines obviously, the plant in disposal I is the lowest. (2). Through analyzing the change of content of dissoluble sugar is less and slower, the content of dissoluble sugar increase from comparison to disposal I except disposal III,that is the content of dissoluble sugar increase with the reducibility of water content in the soil .(3).the content of MDA in water content in the soil is13.50842% has gained biggest .membrane peroxidation has been strongest, the extent of membrane lipide peroxide is highest,the physiological response to the adversity condition on water wane is strongest,these show the fastness of the Gymnema sylvestre is not strong,that is to say,it is not able to bear drought.the content of MDA of Gymnema sylvestre increase with the reducibility of water content in the soil is in cetain scope,such as water content in the soil is over 13.50842%.in this scope, the content of MDA of Gymnema sylvestre increase with the reducibility of water content in the soil. membrane peroxidation increase with the reducibility of water content in the soil, the extent of membrane lipide peroxide increase with the reducibility of water content in the soil, the physiological response to the adversity condition on water wane increase with the reducibility of water content in the soil. .that is to say,in this declines as a whole with the reducibility of water content in the soil,the poison by active oxygen declines as a whole with the reducibility of water content in the soil ,over this scope , the content of MDA declines with the reducibility of water content in the soil ,shows membrane peroxidation declines with the reducibility of water content in the soil , the extent of membrane lipide peroxide declines with the reducibility of water content in the soil, the physiological response to the adversity condition on water wane increase with the reducibility of water content in the soil. Besides, the poison by active oxygen declines with the reducibility of water content in the soil..(4). Although the content of whole chlorophyl evidently increase in the middle with the reducibility of water content in the soil, it declines as a whole with the reducibility of water content in the soil. As water content in the soil is in certain, the content of whole chlorophyl evidently declines as a whole with the reducibility of water content in the soil,this is not only plant chlorophyl composing is restrained by being short of water,but also accelerate intrinsic chlorophyl decomposing,and decomposing is bigger than composing .In certain scope, photosynthesis speed increase with adding of content of chlorophyl.(5).Through analyzing the Fm/F0,Fv/F0 of chlorophyl fluorescence , the content of proline is highest; the content of dissoluble sugar of the Gymnema sylvestre from disposal III is lowest; the content of MDA of Gymnema sylvestre is lower;and it's base diameter and the amount of whopping branch is first,the ratio of biology amount on stem , the longth of growing on the ground and the ratio of biology amount on leaves is second ,the Fv/Fm of chlorophyl fluorescence and the contents of whole chlorophyl of the Gymnema sylvestre from disposal III is the highest, these show the fastness of the Gymnema sylvestre From disposal III is strongest, the endurance of drought is the highest,it'growing is the best these show From comparison to disposal III, latent livingness in PSII ,the efficiency of photochemistry in PSII, the most quanta output of photochemistry in PSII, conversion efficiency on light–energy in the reaction inPSII or the biggest conversion efficiency on light–energy in PSII increases a whole with the reducibility of water content in the soil, latent livingness of disposal III , the efficiency of photochemistry in PSII, the most quanta output of photochemistry in PSII, conversion efficiency on light–energy in the reaction inPSII or the biggest conversion efficiency on light–energy in PSII is highest from disposal III to disposal I, latent livingness of PSII , the efficiency of photochemistry in PSII, the most quanta output of photochemistry in PSII, conversion efficiency on light–energy in the reaction in PSII or the biggest conversion efficiency on light–energy in PSII declines with the reducibility of water content in the soil, latent livingness of PSII, the efficiency of photochemistry in PSII, the most quanta output of photochemistry in PSII, conversion efficiency on light–energy in the reaction inPSII or the biggest conversion efficiency on light–energy in PSII of disposalI is lowest. .the content of MDA of Gymnema sylvestre is lower.