Досліджено вплив теплового стресу (+40 °C, 2 год), охолодження (+4 °C, 2 год) й помірної ґрунтової посухи (чотири доби без поливу) на ріст і гомеостаз цитокінінів у 14- та 18-добових стресованих рослинах жита та після відновлення на 21-шу добу. Показано, що за морфометричними показниками чутливішими до стресів виявились пагони. Після припинення дії стресів за показниками маси сирої та сухої речовини краще відновлювались корені. Динаміка й розподіл цитокінінів залежали від виду стресу та органу рослини. Неспецифічне накопичення в пагонах та зменшення вмісту цитокінінів у коренях спостерігалися за всіх стресів і, зазвичай, найвиразніші зміни були за умов посухи. Продемонстровано пролонговану дію стресів на гомеостаз цитокінінів. У відновлених рослин загальний вміст цитокінінів поступався контролю. Найзначніші зміни відбулися в накопиченні транс-зеатинрибозиду, що свідчить про його участь у формуванні стрес-адаптації жита. Отримані результати закладають основу для подальшого дослідження механізмів стресостійкості у зернових культур і можуть сприяти розробці стратегій для підвищення їхньої адаптивної здатності.
Ключові слова: Secale cereale L., ріст, цитокініни, тепловий стрес, охолодження, ґрунтова посуха, стресостійкість
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