В огляді проаналізовано досягнення сучасної фізіології рослин у галузі вивчення однієї з найважливіших груп класичних гормонів — цитокінінів. Увагу закцентовано на двох новітніх напрямах розвитку досліджень: з’ясуванні походження й еволюції цих гормонів та їх взаємодії з іншими компонентами гормональної системи (ауксинами, гіберелінами, етиленом, абсцизовою та жасмоновою кислотами, брасиностероїдами, стриголактонами). Показано, що, незважаючи на значне поширення цитокінінів у біологічному світі, сигнальних функцій ці гормони набули лише у покритонасінних. Тільки у вищих рослин сформувався тип регуляторики, який об’єднав усі гормональні речовини в єдину сигнальну систему. Наведено відомості щодо існування дуже тісних взаємозв’язків між усіма компонентами гормонального комплексу рослин. Підкреслено провідну роль балансу фітогормонів у регуляції фізіологічних процесів рослин.
Ключові слова: цитокініни, еволюція, взаємодія фітогормонів, регуляція, ауксини, гібереліни, абсцизова кислота, етилен
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