Effects Of Jasmonic Acid Treatment On Resistance To Rhizomania In Sugarbeet

The sugar beet is an important sugar crops and economic crops in our country. However, the sugar beet production and its sugar industry have been affected by disease severely for a long time. Rhizomania is the one of the most serious diseases in sugar beet production currently, it resulted huge economic losses to sugar beet production and its sugar industry. So how to reduce disease and increase the production capacity of sugar beet have become the one of the problems that need to resolve for industrial and agricultural production currently. Many studies in recent years found that jasmonic acid involved and play an important role in the induced resistance of plant.In this experiment, we use the jasmonic acid(JA) with different concentrations to soak the seeds and spray the leaves of sugarbeet varieties with Rhizomania resistance and susceptibility .The influence on the activities of defence enzymes and other related physiological characteristics of the resistant varieties and the susceptible ones were studied in three grade diseased soil by using a method of comparative physiology. The results showed that treatments with JA increased the peroxidase(POD),phenylalanine ammonia lyase(PAL),polyphenol oxidase(PPO), superoxide dismutase(SOD) and catalase(CAT) activities compared with CK, and reduced contents of superoxide anion radical and hydrogen peroxide (H2O2).Moreover, it also increased the yield,percentage of sugar and sugar yield. It suggested that JA treatments can worked to the resistance to Rhizomania in sugar beet. By comparison for treatment of different species, we can come to the conclusion that the induced effects of treatments with JA on the susceptible varieties were better than it on the resistant one. By comparison for treatment of different way, we can come to the conclusion that the treatments of soaking seeds excelled spraying on leaves. Within the limit of the concentration, the optimum concentration of treatments of soaking seeds to the resistant varieties and the susceptible ones were 100μmol·L-1,and the optimum concentration of treatments of spraying on leaves to them were 50μmol·L-1.