Light- and Auxin-Induced Leaflet Opening in Detached Pinnae of Mimosa pudica |
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Authors: | Watanabe Shinobu; Sibaoka Takao |
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Institution: | Biological Institute, Faculty of Science, Tohoku University Sendai 980, Japan |
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Abstract: | Leaflet pairs from detached pinnae of Mimosa pudica opened afterthe pinnae had been irradiated with light (2 W·m2)of 726 or 403 nm, whereas they remained almost closed with lightof 585 or 656 nm. Light-induced leaflet opening was observedonly in the daytime, from 6:00 to 16:00. Application of IAAat more than 30 µg/ml to the cut end of the pinna rachisesmade the leaflets open even in darkness with almost constantlag times of about 100 min which were independent of the concentration.NAA and 2,4-D also made the leaflet open at lower concentrationsthan IAA. Auxin-induced leaflet opening showed diurnal variation.Application of IAA for 2 to 6 min, depending on the concentration,was enough to open the leaflets. Autoradiography showed thatIAA was transferred from the cut end of a rachis throughouta pinna within 4 min.
1Present address: Biological Institute, Faculty of Science,Kobe University, Kobe 657, Japan. (Received September 24, 1982; Accepted March 4, 1983) |
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