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Plant and Cell Physiology, 1985, Vol. 26, No. 6 1167-1174
© 1985

Article

The Relationship of Abscisic Acid to Nitrate Reductase Activity in the Potato Plant

C. E. Palmer

Department of Plant Science, University of Manitoba Winnipeg, Manitoba, Canada R3T 2N2

Abscisic acid (ABA) at 3.8 µM suppressed both in vivo and in vitro nitrate reductase activity in roots, stems and leaves of potato plants grown in solution culture. Suppression was maximal between 24 and 48 h, followed by recovery of activity at 72 h in roots and leaves and at 96 h in stems.

Removal from ABA after 24 h resulted in complete recovery of nitrate reductase activity in roots by 24 h and partial recovery in leaves. ABA treatment enhanced nitrate accumulation in roots, decreased that of leaves, but had no effect on stem nitrate content.

ABA enhanced decay of the enzyme following nitrate removal; by 7 h activity in roots was 22.5% of the initial value compared to 55% in the control. ABA showed a less drastic effect on loss of activity in leaves and stems. These results indicate that ABA suppression of nitrate reductase activity is not dependent on nitrate uptake, and although it reduced leaf nitrate content there was no clear relationship between tissue nitrate levels and the ABA response.

(Received September 13, 1984; Accepted July 1, 1985)
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