Creation of adaptive winter wheat source material in the southern steppe using geographically distant ecotypes

Abstract

Aim. To establish the nature of the influence of the duration of the term “spring regrowth–flowering” on grain yield in varieties of the southern steppe ecotype and lines of soft winter wheat created using late-ripening samples of the Western European ecotype. Methods. Field studies were conducted at the Institute of Climate-Oriented Agriculture of the NAAS (2018–2024, Kherson, 46°38′24″ N 32°36′52″ E and Odessa 2023–2024, 46°29′08.3″ N 30°44′36.6″ E). The object of the research was varieties of soft winter wheat of the southern steppe ecotype and lines obtained using samples of the Western European ecotype. Results. The extension of the duration of the “growth–flowering” period in newly created lines stimulated an increase in grain yield. The highest grain yield was recorded in lines with