Pleiotropic effect of a high pamitic ( p ) and high oleic ( Ol ) mutations in sunflower seed oil was investigated in VK580 near-isogenic lines in field conditions. It was found that the p mutation decreased plant height by 41 cm (32%), number of leaves by 4 (14%) and the period of emergence-flowering by 2 days (4%). The Ol mutation significantly increased plant height by 4 cm (3%). In addition, relationship between inheritance of high palmitic mutation and plant height in the case of selfing of F 2 plants was observed in the cross VK850 ( p ) × VK508 ( Ol ). The correlation coefficient was r=-0.54 with linear equation y=154.49-1.95x. The average plant height of the high palmitic homozygotes in the segregated F 2 population was lower and estimated at 109 cm as compared with 138 cm in the other plants (LSD05=3 cm). Thus, a negative effect of the high palmitic mutation on plant height was proved beyond doubt. A question remains whether this phenomenon relates to a gene linkage or true pleiotropy.