抗微红梢斑螟高产脂思茅松优良无性系选择

Superior Clone Selection of Pinus kesiya var.langbianensis with High Resin Yield and Resistance to Dioryctria rubella

通过测定40个思茅松无性系及1个对照的产脂量、受害梢率及松脂化学组分,研究思茅松无性系间的遗传变异。结果表明,所有无性系产脂量均大于对照产量,抗虫性遗传力为0.62,思茅松无性系间抗虫性存在极显著差异。初步选择出5个抗微红梢斑螟高产脂思茅松优良无性系,其平均产脂量是对照的3倍多,其平均受害梢率仅为1.12%,约为对照的19%。受害梢率与3-蒈烯、γ-松油烯呈极显著正相关,与石竹烯、长叶烯和β-长叶蒎烯呈极显著负相关,表明3-蒈烯、γ-松油烯含量高的无性系易受红梢斑螟危害,而石竹烯、长叶烯和β-长叶蒎烯含量高的无性系抗虫性较高,这3种化学组分可作为思茅松抗虫指标。

This study measured the resin yield,damaged treetop rate,resin chemical composition of 40 high-resin-yield clones and a control of Pinus kesiya var.langbianensis,and analyzed the genetic variation between clones.The results indicated that the resin yield of all the clones were higher than that of the control,the heritability of insect resistance was 0.62.The insect resistance of Pinus kesiya var.langbianensis clones was significantly different.5 high-resin-yield clones with resistance to Dioryctria rubella were preliminary selected.The average resin yield of the selected closes was more than 3 times of the control,the average damaged treetop rate was only 1.12%,was about 19%of the control.The damaged treetop rate was significantly positively correlated with 3-carene andγ-terpinene,and significantly negatively correlated with caryophyllene,longifolene andβ-longipinene.The results indicated that clones with high content of 3-carene andγ-terpinene were more susceptible to Dioryctria rubella,while clones with high content of caryophyllene,longifolene andβ-longipinene had higher insect resistance.These three chemical components can be used as insect resistance indicators for Pinus kesiya var.langbianensis.