Effects of Terpinen-4-ol on Four Metabolic Enzymes and Polyphenol Oxidase (PPO) in Mythimna separta Walker

Control of Tetranychus urticae Koch by extracts of three essential oils of chamomile, marjoram and Eucalyptus

“…The present results of chamomile are in agreement with those documented by Ma et al [21] who found that the highest effect of terpinene-4-ol on esterase activity was noted during recover stage of housefly adult (Musca domestica). The activities of both acid phosphatase and alkaline phosphatase in insects were induced by terpinen-4-ol.…”

“…The activities of glutathione-S-transferase were inhibited at exciting, convulsing and paralysis stages, but gradually recovered at recovering stage. The activities of glutathione-Stransferase probably had relations with toxicity of terpinen-4-ol against larvae of the Mythimna separata [21] . This point will be taken in our consideration in the near future to clarify inhibition of both phosphatase or its individual one.…”

“…These points need further investigations in the future to prove our suggestions by using individual component and its effect on the enzyme activities of T. urticae. Even this suggestion was approved by Ma et al [21] who determined the bioactivity and effect of terpinen-4-ol on activities of some enzymes in adult housefly (Musca domestica). The results showed that the LD 50 of terpinen-4-ol was 23.91 毺g/insect.…”

Acaricidal Activity of Essential Oils of Chamomile, Marjoram and Eucalyptus against the Two-Spotted Spider Mite, Tetranychus urticae Koch: Biology and Enzymes

“…Ma et al, (2004) who found that the highest effect of terpinene -4-ol on esterase activity was noted during recover stage of housefly adult (Musca domesticae). Ma et al, (2008) reported that activities of both acid phosphatase (ACP ) and alkaline phosphates ( AKP ) in insects were induced by terpinen-4-ol , but ACP was inhibited at paralysis stage .The activity of Glutathione S-transferase (GSTs) were inhibited in exciting, convulsing and paralysis stages of 5th star larvae of M.separata, but it gradually recovered in the recovery stage. This affected the metabolism and activity of phophatase and esterase enzymes.…”

“…These points need further investigations in the future to prove our suggestions by using individual component and its effect on the enzymes of T. urticae. Even this suggestion was approved by Ma et al, (2004) and Ma et al, (2008) who cited that Terpinen-4-ol hydrolyzed metabolism by activitying phophatase .in addition that Terpinen-4-ol inhibited protection and immunity system and speeded up death of insects. -148-140-136-132-125-121-117-111-105-101-97-93-86-81-77-71-67-63-59-55-51 Bisabolol …”