Reaction of Resistant and Sensitive Plants to Chlorsulfuron and Phenylurea Cytokinin 4-PU-30

G. Ts. GEORGIEV1, E.T. YAKIMOVA2 and L.K. ILIEV1
1 Bulgarian Academy of Science, M. Popov Institute of Plant Physiology, BG-1113 Sofia, Bulgaria
2 National Centre for Agrarian Sciences, AgroBioInstitute, BG-2232 Kostinbrod-2, Bulgaria

Abstract

GEORGIEV, G. Ts, E. T. YAKIMOVA and L. K. ILIEV, 2001. Reaction of resistant and sensitive plants to chlorsulfuron and phenylurea cytokinin 4-PU-30. Bulg. J. Agric. Sci., 7: 35-41

Laboratory studies were initiated to determine the efficiency of the phenylurea cytokinin 4-PU-30 as protectant of corn (Zea mays L.) against postemergence chlorsulfuron injury. The effect of herbicide and cytokinin was also studied on wheat (Triticum aestivum L.) – a resistant to chlorsulfuron species. 4-PU-30 and chlorsulfuron exerted opposite action on the growth of corn and wheat plants. 4-PU-30 stimulated the corn growth and suppressed growth of wheat, whereas chlorsulfuron stimulated wheat growth and inhibited that of corn. Chlorsulfuron overcame the inhibition of wheat seedlings caused by 4-PU-30 and 4-PU-30 protected corn from postemergence applied sulfonylurea herbicide chlorsulfuron – moreover in some cases a stimulated growth of the seedlings was registered. The information obtained indicates that 4-PU-30 exerted antidote influence against chlorsulfuron on corn.

Key words: herbicide antidote, sulfonylurea, phenylurea cytokinin