Analysis of variability of seed productivity in narrow-leaved lupine cultivars

The aim of the study is to assess the degree of variability of seed productivity and its elements by years in contrasting meteorological conditions of the Central Region of the Non-Chernozem zone of the Russian Federation in the varieties of narrow-leaved lupine, diametrically opposite in the type of branching. Long-term field trials (2009-2020) were carried out of varieties of narrow-leaved spike lupine (Ladny, Dikaf 14) and indeterminate (Nemchinovsky 846, Belozerny 110) types in contrasting meteorological conditions of the Moscow Region. The degree of dispersion of long-term data on seed productivity and its elements was assessed by the standard deviation σ, dispersion S2, coefficient of variation CV, regression parameters (medium index I, regression slope bi, deviation from regression s2d), coefficients of ecovalence Wi, phenotypic stability S2, adaptability Kad, a complex indicator of the level of productivity and stability of the PUSS variety. On average, over 12 years, the weight of seeds from plants of indeterminate varieties was 2 times higher than from spike-like varieties. Basically, such differences were due to the 3 times greater number of beans on lateral branches in indeterminate varieties. The degree of variability of the number of seeds in a pod and the weight of 1000 seeds is from insignificant to medium (CV = 7-11 % and CV = 12-20 %, respectively), the number of beans on the main stem is significant (CV = 22-26 %). A very high variability (CV above 30 %) in the number of beans on lateral branches and the weight of seeds per plant indicates the heterogeneity and multicomponent character of the indicators. Indeterminate varieties were characterized by greater resistance to the weight of 1000 seeds, the number of seeds in a pod, and the number of beans per side shoot as compared to spike-like varieties. In terms of bi, Kad, PUSS indices, the indeterminate varieties in terms of seed productivity were characterized by better adaptability and plasticity compared to spike-like varieties. Variety Dikaf 14 surpassed other varieties in terms of stability s2d and Wi, which indicates the possibility of breeding spike-shaped forms for stability of seed productivity.