松墨天牛取食和人为损伤对马尾松针叶部分化学物质含量的影响

为探索松墨天牛Monochamus alternatus Hope与其寄主马尾松相互作用的关系，测定了松墨天牛取食和人为损伤1天、3天、6天、10天和15天后马尾松针叶营养物质和次生代谢物质含量的变化。结果表明： 松墨天牛取食和人为损伤均能引起马尾松针叶可溶性糖和粗多糖含量的下降，但虫害处理使新叶和老叶中可溶性糖降低更多。两种方式处理后10天马尾松新叶和老叶中蛋白质含量降到最低，然后逐渐回升； 相比较而言，虫害处理蛋白质含量降幅更大。松墨天牛取食和人为损伤均引起马尾松针叶单宁和黄酮类物质含量的增加，虫害处理的针叶中单宁和黄酮类物质的含量更高。结果提示马尾松对松墨天牛的取食为害具有特殊的应激反应机制。

Effects of Monochamus alternatus Hope feeding and artificial damage on the contents of several chemicals in needles of Pinus massoniana

The concentrations of nutritional chemicals and secondary metabolites in new and old needles of Pinus massoniana following attack by Monochamus alternatus Hope and artificial damage were assayed. The results indicated that the levels of soluble sugars and rough polysaccharides in new and old needles fluctuated after treatments, but the concentrations in needles of P. massoniana fed by M. alternatus were less than those in needles injured by artificial damage. Treatments of both ways caused the decrease of protein and the increase of tannin and flavonoid in needles. The contents of protein decreaed at first after treatments of both ways, and began restoring to the control level 10 d after treatments. But the effects of feeding by M. alternatus were stronger than the treatment of artificial damage. Feeding by M. alternatus influenced strongly the content of tannin in new and old needles, whereas artificial damage had no influence on the content of tannin in old needles. After treatments by feeding and artificial damage, the contents of flavonoid in new and old needles were higher than that in the control, but the effect of feeding damage was stronger. These results suggested that the host P. massoniana had evolved special defense mechanism against the damage by M. alternatus.