Evaluating mechanical composition of blackcurrant berries samples of Novosibirsk selection

The purpose of the study is to assess the phenotypic diversity of the mechanical composition of berries and the sources of its variation. The study was conducted in 2019-2021 on the collection site located on the territory of the arboretum SibRIPP&B - Branch of ICG SBRAS (Novosibirsk Region). The objects of the study are plants of 16 varieties of black currant of local selection, which have proven themselves to be early-growing, highly winter-hardy and self-fertile. The size (mass) of berries (MS) and their uniformity were assessed using the UPOV recommendations, the number of seeds per berry (NSV) was determined by counting the seeds performed in 30 berries, covering all available sizes. Based on the results of the analysis of variance, the influence of factors on the diversity of variety samples according to the studied traits was established in the following shares: “genotype” - 11.8 % (WB), 23.7 % (NSB); "year" - 4.6 % (WB), 1.3 % (NSB) and "genotype × year" interaction - 7.8 % (WB), 5.5 % (NSB). Differences in the influence of factors on the variability of the statistical parameters of the signs of WB and NSB of each sample during three years were revealed. The greatest effect of the "genotype" factor was found on the parameters "arithmetic mean" (M) and "maximum" of the CSF trait (77.7 and 80.9 %), the "year" factor depended on 19.0 % of the M of the berry weight, on 16 .0 and 16.3 % - "coefficient of variation" of both features. The grouping of accessions according to the NSB was carried out on the basis of the long-term average for the collection (M = 37.4 items) and the value of the smallest average difference (LSD05 = 8.36). Morphotypes were identified according to three gradations of NSB and their corresponding local reference varieties: small ( 45) - Degtyarevskaya. The stability of the mechanical composition over the years differed in the samples of Zapozdalaya, Iskitimskiy dar, Pamiati Potapenko, Shadrikha, EF 5-95-10. The results obtained will be used to compile a database of the Ribes nigrum L. collection, as well as to track the stability of accessions by age and microzonal changes.