The well known inhibitory effect of abscisic acid (ABA) on growth and protein mobilization was confirmed. In general benzylaminopurine (BAP) is known as a stimulator of plant growth. However in very high concentration BAP provoked a little suppression of plant growth and of activity of some proteolytic enzymes. Irrespective of this a faster hydrolysis of storage proteins in BAP treated seeds was detected. Similar results to BAP action after N₁-(2-chloro-4-pyridyl)-N₂ phenylurea (4PU-30) treatment were obtained.

Data for growth, proteolytic activity and protein content of maize seedlings treated with 4PU-30 and chlorsulfuron (CS) in an identical  high concentration enlarged our knowledge for their relationship and supported the assumption for antagonistic action of these agents with very strong structural similarity. As CS is newly developed and widely used herbicide these results have not only theoretical but also practical significance.