Impact of chronic radiation exposure on phytohormonal status of pine trees in the Chernobyl exclusion zone

The paper presents results of the study impacts chronic radiation exposure on hormonal system Scots pine in Chernobyl exclusion zone. Pine needles taken from three experimental plots with a contrasting level radioactive contamination: Polesie State Radioecological Reserve, Kozeluzh’ye forestry and Khoiniki June 2021 were used study. Artificial stands planted 1982, few years before accident. When impact trees was assessed content Cs-137, Sr-90, Am-241, Pu-238 и Pu-239+240 soil into account. absorbed dose rates contaminated sites varied range 1.5-24.6 µGy/h, control rate 0.58-0.6 µGy/h. main classes phytohormones: indol-3-acetic acid, indolyl-3-butyric zeatin abscisic acid estimated use high-performance liquid chromatography. No significant changes phytohormonal status pines zone found. relationship between statistically difference phytohormones irradiation is may be caused by great biological variability natural populations or other nonradiation factors.