Relationship between Witches' Broom Protein and Dynamic of Some Amino Acids in Paulownia Tree Leaves

This paper dealt with the SDS polyacrymide gel electrophoresis of proteins ahd analysis of the amino acids in the diseasedand healthy leaves with the same strain respectively, which were at the same side and height, of Paulownia catalpifolia, P. elongata, P. albiphloea and P. kauakamii respectively. The results indicated that the leaves of 4 species of Paulownia trees with witches' broom had one protein band, of which molecular weight was 12 kD, which did not appear in the healthy leaves free of phytoplasmas. Moreover, the protein quantity in the affected leaves was more than that in the healthy leaves free of phytoplasmas, At the same time, there was significant difference on the amino acids between the healthy and diseased leaves of P. catalpifolia and P. kawakamii. The amount of cystine in the affected leaves was higher than that in the healthy leaves, but the change of amount of phenylalanine in the affected and healthy leaves was contrary.These changes of proteins and amino acids in the leaves might be related to the witches' broom of the Parlounia trees.

泡桐丛枝病诱导抗性机制的研究

测定了根接和皮接诱导处理后泡桐苗木及５ａ生幼树过氧化物酶（ＰＯＤ）、多酚氧化酶（ＰＰＯ）和苯丙氨醚解氨酶（ＰＡＬ）总活性。结果表明，根接和皮接诱导处理的泡桐苗木和５ａ生幼树３种酶总活性都显著高于对照。泡桐幼树丛枝病发病率诱导处理后３种酶活性的变化与泡桐幼树的抗病能力有相关性，根接诱导后的３种酶总活性最高，幼树发病率和感病指数都为零；皮接诱导后３种酶活性次之，幼树发病率为４．７％，感病指数为１．４７；对照的３种酶活性最低，幼树发病率达５９．２％，感病指数为３３．５４。