Studies On Effects Of Salicylic Acid On Salt Resistance On Growth And Development And Ultrastructure Of Cucumber

Soil salinization is an important factor that can affect crop growth.How to settle soil salinization has become a significant problem,which is not only international,but also wrgency in biological technology. The teait of agritechnology is adopting man-made measure to alter pary environment,which will greatly improve the yield and quality of vegetable .But because it,s not very scientific of culture ,water and fertilizer ,the phenomenon of salinity accumulation is so apparent .The it causes soil salinization of sheltered farmland,which severely affects the production. On the basis of the research on the biology effect of salicylic acid,the experiment simulates salinity of soil salinization,try to study the effect of use different consistence salicylic acid in the different period growth and development,production,metabolism as well as the membranes system and the ultrastructure of cucumber.Try to supply the theory evidence of agritechnology for the salicylic acid the alleviation salt resistance,Now it concludes: Firstly,The different consistence of salicylic acid can improve the germination rate,germination force,germination index,vigor index and reduce the germination time of cucumber seed under salt stress.The adopt consistence is 2mM,but when the consistence of salicylic acid raise too high the effect of relieve is not obvious。At the same time,salicylic acid also can improve the plant height and stem diameter of cucumber seedlings and the adpot consistence is 2mM. Second,salicylic acid can obviously improve the chorophyll content in leaves of cucumber seedlings,Na+ /K+ and the activity of POD,reduce relative conductance rate and injury rate in leaves of cucumber seedlings under salt stress.When use 2mM salicylic acid in two pieces of euphylla unfold the relieve effect is best,but when the when the consistence of salicylic acid raise to 4mM the relieve effect is not obvious even harm to cucumber seedlings. At the same time,salicylic acid also can improve the root activity and decline the content of MDA in leaves of cucumber seedlings under salt stress. The best relieve effect is use 1mM salicylic acid when two pieces of euphylla unfold. Third,Different consistence of salicylic acid can improve the production of cucumber under salt stress. The best relieve effect is use 2mM salicylic acid when two pieces of euphyllavs unfold. Forth,The treament of salicylic acid can relatively improve the number and size of chloroplast and starch grainin leaves of cucumber seedlings under salt stress and the area of cucumber leaves. The arrangement of palisade tissue is more orderly and close so improve the rate and ability of photosynthesis and relieve the harm to the leaves and root of cucumber seedlings under salt stress. It is concerned that use 1,2mM salicylic acid when one or two piece of euphylla the relieve effect is best.we should use SA in lesser age of leaves.