BENZYLADENINE-INDUCED GROWTH-RESPONSE OF WHEAT PLANTS AND ENDOGENOUS PHYTOHORMONE CONTENT AS AFFECTED BY MINERAL-NUTRITION

The endogenous phytohormone content and the growth response to benzyla denine of wheat plants grown in a water culture were studied under opt imal (10% Hoagland-Arnon nutrient medium) and deficient (2% Hoagland-A rnon nutrient medium) conditions of mineral nutrition. Abscisic acid c ontent was lower in the control plants than in the nutrition-deficient plants. Benzyladenine-induced growth response was observed earlier in the former than in the latter, correlating with faster cytokinin accu mulation in plants grown under optimal conditions. The possible role o f abscisic acid in the regulation of cytokinin accumulation and benzyl adenine-induced growth of plants is discussed.