Effect of needle damage on the release rate of Masson pine (Pinus massoniana) volatiles.
The effect of needle damage on the release rate of Masson pine (Pinus massoniana Lamb.) volatiles was examined. Needles were continuously damaged by mechanical damage (MDP) or by feeding of pine caterpillar (Dendrolimus punctatus) larvae (LFP); undamaged pine was used as a control (UDP). Volatiles were collected before damage, and at 16, 24, 40, 48, 64, 72, 88 and 96 h post-damage, and analyzed. The analyses revealed that 19 compounds identified as constitutive volatiles from UDP were terpenes and green leaf odors. The release rate of volatiles from MDP or LFP was higher than that from UDP. At 96 h post-damage, emission from MDP or LFP returned to the same level as that of UDP. Some volatiles, including sabinene, ocimene, limonene-1,2-epoxide, linalool, linalool acetate, germacrene D: -4-ol, farnesol, and (E)-4,8-dimethyl-1,3,7-nonatriene were induced by mechanical damage and/or larval attack. Furthermore, the release rate of linalool acetate, farnesol, or (E)-4,8-dimethyl-1,3,7-nonatriene from LFP was higher than that from MDP. Based on an exact estimation of the proportion of damaged pine needles, a significant linear correlation between the release rate of total volatiles identified and the proportion of damaged needles was found in the case of LFP but not MDP.
Su
Jian-Wei
JW
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, People's Republic of China. sujw@ioz.ac.cn
Zeng
Ju-Ping
JP
Qin
Xiao-Wei
XW
Ge
Feng
F
D000818:Animals; D002630:Chemotactic Factors / Q000032:analysis / Q000378:metabolism; D017753:Ecosystem; D006790:Host-Parasite Interactions; D007814:Larva; D007915:Lepidoptera / Q000502:physiology; D028223:Pinus / Q000469:parasitology / Q000502:physiology*; D014835:Volatilization
D002630:Chemotactic Factors