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Plant and Cell Physiology, 1995, Vol. 36, No. 7 1303-1309
© 1995

Dihydrokaempferol Glucoside from Cotyledons Promotes Flowering in Pharbitis nil

Fumi Nakanishi1, Takenori Kusumi2, Yukinobu Inoue3 and Tadashi Fujii1

1 Institute of Biological Sciences, University of Tsukuba Tsukuba, Ibaraki, 305 Japan
2 Faculty of Pharmaceutical Sciences, University of Tokushima Tokushima, 770 Japan
3 Department of Chemistry, University of Tsukuba Tsukuba, Ibaraki, 305 Japan

An extract of cotyledons of Pharbitis nil, which had been exposed to short-day conditions, was tested for flower-promoting activity in a shoot-tip assay system in vitro. The crude extract had no flower-promoting activity, however, after partitioning of the crude extract with dichloromethane, the resulting aqueous fraction had flower-promoting activity. This activity was separated into two fractions by column chromatography on Toyopearl HW-40. One active fraction was identified as dihydrokaempferol-7-O-rß-D-glucoside (DHK-glc). This compound exhibited flower-promoting activity at the extremely low concentration of 4.4x10-9.

(Received April 25, 1995; Accepted August 11, 1995)
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