biologia plantarum

Biologia plantarum 20:431-435, 1978 | DOI: 10.1007/BF02923346

Acid and alkaline inorganic pyrophosphatase activity after treatment with various herbicides

M. Decleire¹, W. De Cat¹

¹ Institut de Recherches Chimiques, Museumlaan 5, Belgique

Various herbicides are applied on seventeen-day-old cucumber seedlings growing in a nutrient solution.
After 1 and 3 days, acid and alkaline pyrophosphatase activities are measured in the leaves and the roots of seedlings treated with lethale dosis of atrazine, chlortoluron, ioxynil, MCPA, dicamba, alachlor. The same enzymes are determined after 5 h in seedlings on which previously paraquat and DNOC were pulverised. In the leaves, acid pyrophosphatase activity is stimulated by almost all the herbicides, especially by ioxynil, paraquat and DNOC while alkaline pyrophosphatase remains similar to the controls. The alkaline and acid pyrophosphatase activity in the roots is either unchanged or stimulated or inhibited without any correlation with the various modes of action of the herbicides.

Received: February 20, 1978; Accepted: May 11, 1978; Published: November 1, 1978  Show citation