Trifluralin effect on Pisum--Rhizobium relationship.

Trifluralin inhibited root and shoot elongation of Pisum sativum plant and caused isodiametric increase in cell volume of both tissues. The water content of the plant was not affected. The weedicide inhibited also growth and O2 uptake of Rhizobium leguminosarum, isolated from Pisum plant. Reduction in the nitrogen content of Pisum tissues was noticed, and this may be attributed to the inhibition of nodule formation. Variations in the free and protein-amino acids were observed in the plant tissues, due to the application of the weedicide.