GENOTYPE-ENVIRONMENT INTERACTION IN QUANTITATIVE TRAITS FORMATION IN WHITE LUPINE (Lupinus albus L.) ACCESSIONS

The search for genotypes with high productivity and stability is a key aspect in modern breeding programs that aim to develop genotypes with high manifestations in different ecological regions. The purpose of this study was to estimate the phenotypic stability of 15 white lupine accessions regarding productivity and stability of main quantitative traits. A field trial was conducted during the period 2016-2018, at the Institute of Forage Crops (Pleven, Bulgaria). It was used a randomized block method. The genotype influence was strongest regarding 1st pod height (55.16%), pod length (45.21%) and 1000 seeds weight (34.43%). The stability parameters for plant height determined Lp 27 and Lp 27\10 as stable and high-growing. Lp 4 was of interest regarding pod length, pod width, and seed weight, and Lp 1 was in a favorable position concerning 1000 seeds mass. Lp 6 was the closest to the ideal type, combining high productivity with stability in terms of main quantitative traits. Suitable parental components in combinative breeding for the development of high yielding cultivars were Lp 1, Lp 4 and, Lp 6, which exhibited stability and productivity in main traits.