应用^(32)P和^(86)Rb对泡桐丛枝病病枝、叶吸收磷钾规律的研究

THE UPTAKE OF PHOSPHORUS AND POTASSIUM IN DISEASED TWIGS AND LEAVES OF PAULOWNIA WITCHE'S BROOM BY USING ^(32)P AND ^(86)Rb

泡桐丛枝病在我国发生普遍,特别是在河南、山东和陕西关中地区危害严重,群众称之为泡桐的癌症。该病病原在1967年被日本人确定为类菌质体(MLO)。我国有不少人对这一病害作过研究,并取得了一定成绩。为了寻求更有效的防治措施,我们曾对该病进行了较为系统、全面的调查研究,对土壤中N、P、K含量的百分比值与感病指数间的关系,应用通径分析法进行研究,发现磷含量越高,发病越轻;钾含量越高,发病越重。经回归分析得知感病指数与P/K比值成反相关。在此基础上,对泡桐丛枝病病枝、叶对磷钾的吸收规律及不同种泡桐苗木吸收磷钾情况进行了同位素示踪试验。

There is a close relationship between the amount of content of P and K in soil and the incidence of the disease. When the content of P in soil is high, the incidence of the disease would be slight. When the content of K in soil is high the incidence of the disease would be serious. Index of invasion is in a negative correlation with P/K based upon the results, ^(32)P and ^(80)Rb were used as radioisotope tracer in uptake by diseased twigs and leaves of Paulownia. Results indicated that the species which is resistant to the disease absorbed more K and less P than the species which is susceptible.