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Plant and Cell Physiology, 1985, Vol. 26, No. 5 873-880
© 1985

Article

Induction of 3-Hydroxy-3-methylglutaryl CoA Reductase in Potato Tubers after Slicing, Fungal Infection or Chemical Treatment, and Some Properties of the Enzyme

Kazuko Ôba1,2, Katsuyoshi Kondo1, Noriyuki Doke3 and Ikuzo Uritani1,2

1 Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan
3 Plant Pathology Laboratory, Faculty of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan

Intact tubers of potato (Solanum tuberosum L. cv. Irish Cobbler and an interspecific hybrid between S. tuberosum and S. demissum cv. Rishiri) contain a very low activity of 3-hydroxy-3-methylglutaryl (HMG)-CoA reductase. The activity increased first in response to slicing, and again in response to additional treatments such as inoculation with an incompatible race of Phytophthora infestans, application of a hyphal wall component of the fungus or HgCl2 solution, and then decreased. Both the first and the second increases in activity in response to slicing and additional treatment with a hyphal wall component to elicit phytoalexin production were inhibited by blasticidin S. Properties of HMG-CoA reductase induced by slicing and by additional treatment with HgCl2 or fungal inoculation were investigated.

2 Present address: Faculty of Home Economics, Nagoya Women's University, Shioji-cho, Mizuho, Nagoya 467, Japan.

(Received February 20, 1985; Accepted May 4, 1985)
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