Creation of highly adaptive source material for varietal selection of leaf lettuce

The results of scientific research on the study of source material adaptive capacity for varietal selection of leaf variety seed lettuce were highlighted. Objective of the research: to analyze the adaptive properties of inbred lines of leaf variety seed lettuce and allocate valuable sources for varietal selection. Methods of research: during the growing period of plants the phonologic observations were carried out: dates of seeding, sprouting, appearance of first true leaf, early (10%) and mass (75%) onset of economic suitability, shooting, flowering, seeds ripening. The lines were evaluated compared to correspondent breed-standard Snizhynka which appears in the State Register. Research results: Seven promising highly productive inbred lines which were distinguished by high stability by yield under the conditions of growing in agro-climatic zone of Northern Forest Steppes of Ukraine were identified as a result of 3-year research (2013-2015). Conclusions. As a result of 3-year research (2013-2015) seven promising inbred lines of leaf variety seed lettuce were selected that exceeded breed-standard Snizhynka by productivity, distinguished by high levels of adaptability by productivity and are promising source material for use in selection programs.