title: Action spectrum for the suppression of arylalkylamine N-acetyltransferase activity in the two-spotted spider mite Tetranychus urticae.
abstract: An action spectrum was obtained for the suppression of arylalkylamine N-acetyltransferase (NAT) activity in the two-spotted spider mite Tetranychus urticae by irradiating the mite with monochromatic lights of various wavelengths using the Okazaki Large Spectrograph at the National Institute for Basic Biology, Okazaki, Japan. Fluence-response curves were obtained for wavelengths between 300 and 650 nm by irradiating the mite for 4 h day(-1). The samples were frozen after the third exposure. A negative correlation between the logarithmic fluence rate and NAT activity was detected in the range of 0.01-1 micromol m(-2) s(-1) for wavelengths between 300 and 500 nm and in the range of 0.1-10 micromol m(-2) s(-1) for wavelengths between 550 and 650 nm. The constructed action spectrum indicated that the photoreceptors mediating the circadian and/or photoperiodic systems might be UV-A- and blue-type photoreceptors with absorption peaks at 350 and 450 nm.
authors.affiliation: Graduate School of Science and Technology, Kobe University, Nada, Kobe, Japan. t-suzuki@stu.kobe-u.ac.jp
authors.forename: Takeshi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Norimitsu
authors.initials: N
authors.lastname: Izawa
authors.forename: Takuya
authors.initials: T
authors.lastname: Takashima
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Watanabe
authors.forename: Makio
authors.initials: M
authors.lastname: Takeda