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Plant and Cell Physiology, 2001, Vol. 42, No. 8 864-867
© 2001 Oxford University Press

Partial Characterization of Farnesyl and Geranylgeranyl Diphosphatases Induced in Rice Seedlings by UV-C Irradiation

Jaehyuk Nah, Seon-Joo Song and Kyoungwhan Back1

Department of Genetic Engineering, Agricultural Plant Stress Research Center, Chonnam National University, Kwangju, 500-757 South Korea

This study reports the identification and characterization of allyl diphosphatases (EC 3.1.7.1) in plants by using rice seedlings. Two distinct Mg2+-independent allyl diphosphatases, which convert farnesyl diphosphate (FDP) and geranylgeranyl diphosphate (GGDP) into farnesol and geranylgeraniol, respectively, were induced in rice seedlings irradiated with UV-C. Farnesyl diphosphatase (FDPase) and geranylgeranyl diphosphatase (GGDPase) are located in the microsomal fraction. The relative specific activity of FDPase was much higher than the specific activity of GGDPase. FDPase activity was inhibited by GGDP (50% inhibition at 5 µM) and geranyl diphosphate (50% inhibition at 100 µM). In contrast, GGDPase activity was inhibited 50% by 50 µM isopentenyl diphosphate or 100 µM FDP. The optimal pH for FDPase was 6.3 and for GGDPase was 7.9.

1 Corresponding author: E-mail, kback@chonnam.chonnam.ac.kr; Fax, +82-62-530-2169.


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