Inclusions Changes In Different Families Of Pinus Massoniana Lamb Damaged By Hemiberlesia Pitysophila Takagi

It has been paid more and more attention to forest tree with high resistance to target pest in forestry production. Study of insect-resistant mechanism has also been made more progress. Biochemical characteristic of plant is an important part in pest resistance. It has direct influence on pest's food nutrition, digestive performance, feeding directionality, inhabitation and oviposition. And it also has indirect influence on other characteristics. In this paper, content of secondary substances and nutrient substances in masson pine family with different resistance to Hemiberlesia pitysophila are determined. And inclusion contents in damaged plant are compared with those in undamaged plant. The results are following:1. The outbreak of H. pitysophila occurs from the middle ten days of April to the last ten days of June. During this period, contents of flavonoid, total phenols and tannin in damaged plant of masson pine family with high resistance increase are higher than those in undamaged plant. It suggests that high resistant family has stress response by increasing content of secondary substance and resists to H. potysiphila. In the last ten days of June, contents of flavonoid and tannin in high susceptible family decrease. Content of total phenols shows a rising trend, but is still lower than that in the undamaged plant. This suggests that the lower contents of flavonoid, total phenols and tannin in damaged plant are not sufficient to resist H. pitysophila. That will cause serious damage to masson pine.2. Contents of flavonoid and tannin in undamaged plant of high resistant family 330 and 386 are significantly higher than those in undamaged plant of high susceptible family 439. This suggests that the higher contents of flavonoid and tannin in high resistant family play important roles in resisting to H. pitysophila. In the damage of the second, the third and the fourth generation of H. pitysophila, content of total phenols in undamaged plant of high resistant family 330 and 386 is very significantly higher than that in undamaged plant of high susceptible family 439. It indicates that content of total phenols in high resistant family has a relationship with the resistance.3. In the middle ten days of April, contents of soluble sugar and polysaccharide in damaged plant of all masson pine family are higher than those in undamaged plant. This shows that the damaged masson pine changes its nutrient proportion by increasing contents of soluble sugar and synthesizing polysaccharide. This goes against the digestion and absorption of H. pitysophila, and increases pressure to metabolism. In the last ten days of June, contents of soluble sugar, polysaccharide and protein in damaged plant of all masson pine family are lower than those in undamaged plant. The damaged plant resists to H. pitysophila by decreasing nutritional components and synthesizing secondary substances through part of nutrient substances.4. During the outbreak period of H. pitysophila, contents of soluble sugar in high susceptible family 439 are very significantly higher than those in high resistant family 330 and 386. It suggests that contents of soluble sugar in masson pine have a certain relationship with the damage of H. pitysophila. Meanwhile, contents of soluble sugar, polysaccharide and protein in damaged plant of high resistant family 330 and 386 are very significantly higher than those of high susceptible family 439. It shows that high resistant family can provide more energy for secondary substances when population density of H. pitysophila is the highest.