Relations between attacking of Dendroctonus armandi and nutrition and resistance material of host trees (Pinus armandi)
2007
Pu Xiaojuan | Chen Hui
中国人. 对秦岭林区遭受华山松大小蠹危害不同阶段的被害华山松韧皮部内的营养物质含量和酶活性变化进行了测定。结果表明，在华山松大小蠹和共生蓝变真菌危害初期，华山松韧皮部内的苯丙氨酸解氨酶(PAL)、多酚氧化酶(PPO)、超氧化物歧化酶(SOD)活性均显著提高，丙二醛(MDA)含量明显增加；但随着华山松大小蠹种群数量的增加和蓝变真菌对华山松韧皮部和木质部组织危害的加剧，韧皮部组织内的PAL、PPO和SOD活性逐渐降低，在枯立木阶段降至最低；与此同时，华山松韧皮部内的水分及蛋白质、糖类、粗脂肪、淀粉等营养物质含量，则随华山松大小蠹和共生蓝变真菌危害的加剧而不断减少。华山松大小蠹的入侵危害降低了华山松韧皮部的生理生化抗性，加速了其营养的分解。
显示更多 [+] 显示较少 [-]英语. This paper focused on the nutrient and enzyme of phloem in different attacking stages host trees, Pinus armandi, in pine ecosystem of Qinling Mountains.The results showed that at the beginning stage of being attacked by Chinesis white pine beetle (Dendroctonus armandi) and their symbiotic blue-stain fungus (Leptographium qinlingensis), PAL, PPO, SOD activities and MDA content significantly increased in the phloem of P.armandi, and decreased with the increase of the number of D. armandi and the attacking on the xylem and phloem of P. armandi from blue-stain fungus, then reached the minimum level in withering stage of P.armandi. But the contents of nutrition materials in the phloem, such as water, protein, glucide, fat, amylum and so on, declined with the infestation of D. armandi and symbiotic fungus. In summary, the resistance of physiology and biochemistry in the phloem of P. armandi was decreased, the reduction of nutrition was accelerated by the attacking of D. armandi.
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