桉树不同无性系叶片内含物变化与枝瘿姬小蜂抗性的关系

Relationship between Inclusion Contents in Leaves of Different Eucalyptus Clones and Its Resistance to Leptocybe invasa

摘要:

为探讨桉树(Eucalytpus spp.)受枝瘿姬小蜂(Leptocybe invasa)危害后的生理响应, 对24个桉树无性系在桉树枝瘿姬小蜂生长周期连续5个月的危害情况及其营养物质含量的变化进行研究。根据受危害等级, 将24个桉树无性系分为高感、中抗和高抗3种类型。结果表明, 3种抗性类型桉树在未受危害前, 叶片的可溶性蛋白质含量和可溶性糖含量均无显著差异;在受到危害后, 高感、中抗无性系叶片的可溶性蛋白质含量、可溶性糖含量均呈增长趋势。与对照相比, 高感无性系内含物含量随桉树枝瘿姬小蜂危害加剧显著增加。桉树无性系叶片内含物含量增长以高感类型>中抗类型>高抗类型。这说明桉树叶片内含物含量增加是桉树对枝瘿姬小蜂危害的重要防御措施。

Abstract:

Leptocybe invasa Fisher & La Salle is a serious disease for Eucalyptus. In order to understand physiological response of Eucalyptus to Leptocybe invasa damage, the damage degree and some inclusion contents in leaves of 24 Eucalyptus clones hazard by Leptocybe invasa were studied for continuous five months. According to the damage degree, all clones were divided into 3 types, such as high sensitive, middle resistance and high resistance. The results showed that the soluble protein and soluble sugar contents in leaves had no significant difference among three resistance types before the 24 Eucalyptus clones were damaged by Leptocybe invasa, while those in high sensitive and middle resistance clones leaves significantly increased after damaged. Contrasted to control, soluble protein and soluble sugar contents in high sensitive clones leaves significant increased with damage aggravation. The increment of inclusion contents in Eucalyptus clones leaves was in order as high sinsitive > middle resistant > high resistant. Therefore, it was suggested that the increment of inclusion contents in Eucalyptus clones leaves was an important physilogical response to damage of Leptocybe invasa.