Effects Of Saline-Alkali Stresses On Seed Germination,Growth And Physiological Traits Of Elytrigia Elongate L.

Land salinization is a global issue affecting agricultural production and the ecological environment.Therefore,how to improve and use salinized soil has become an important problem that needs to be solved urgently.Studies have confirmed that the introduction of economical salt-tolerant plants in saline-alkali land is one of the most effective biological measures to solve the problem of soil alkalization.Elytrigia elongate L.is a high-yield forage grass with excellent characteristics such as drought tolerance,cold tolerance,large spikes and more flowers.In order to fully explore the resource advantages of Elytrigia elongate L.,and understand its physiological adaptability to saline-alkali stress,I conducted a research.In the research,Elytrigia elongate L.was used as the researchl material.The contents of the research are the effects of four kinds of single salt and mixed saline-alkali stress on the germination of Elytrigia elongate L.seeds,and the effects of salt-alkali stress?NaCl,Na₂CO₃?on the growth of Elytrigia elongate L.It can provide data basis for planting Elytrigia elongate L.in Northeast China.The main conclusions of the research are as follows:?1?Effects of four kinds of salt stresses?NaCl,Na₂SO₄,NaHCO₃,Na₂CO₃?on seed germination of Elytrigia elongate L.:with the increase of salt concentration,the germination rate,germination power,germination index and vigor index of Elytrigia elongate L.showed a downward trend.The inhibitory effects of four kinds of single on the germination of Elytrigia elongate L.seeds are generally expressed as:divalent salt>monovalent salt.?2?Effects of mixed salt-alkaline stresses on seed germination of Elytrigia elongate L.:the results showed that under mixed salt-alkali stress,the germination rate of the seeds under the two groups of neutral salt A combination and the lower salt-alkali group B at 300 mmol/L still exceeded 80%.Salt and alkali resistance.In general,germination can be normal under the conditions of high salt?200mmol/L?and low alkali?pH value<8.29?or high alkali?pH value is 10.60?and low salt?50mmol/L?.Under mixed saline-alkaline stress,salinity and alkalinity?pH?have a very significant synergistic effect,and mixed saline-alkaline stress is more harmful than salt stress or alkaline stress alone.?3?Effects of two kinds of salt stresses?NaCl,Na₂CO₃?on growth of Elytrigia elongate L.:different concentrations of NaCl and Na₂CO₃ were used to stress treatment on Elytrigia elongate L.,and the growth and physiological indicators were measured,so as to analyze the characteristics of the stress effect of the two salts on the growth of Elytrigia elongate L.The results showed that NaCl and Na₂CO₃treatments inhibited the growth and material metabolism of Elytrigia elongate L.to varying degrees,and Na₂CO₃ stress treatment was more obvious.It is specifically manifested as a decrease in relative daily growth rate,leaf area,root-shoot ratio,relative water content,and chlorophyll content.The NaCl and Na₂CO₃ treatments disrupted the plasma membrane function of Elytrigia elongate L.With the increase of salt concentration,the K⁺content decreased,while the Na⁺content increased.Photosynthesis is an important metabolic process for plant growth.Both salts reduced the photosynthesis of Elytrigia elongate L.,and the inhibitory effect of alkaline salt stress on the assimilation rate was mainly affected by non-stomatal factors.As the concentration of saline-alkali stress increased,the soluble sugar in Elytrigia elongate L.showed an upward trend and gradually accumulated.Overall,NaCl and Na₂CO₃affected the growth,photosynthesis,and material metabolism of Elytrigia elongate L.to varying degrees.Among them,the treatment with alkaline salt Na₂CO₃ was more serious.