Evaluation of rice collection samples Oryza sativa L. in the Russian Far East

Relevance. Early-ripening varieties breeding is a constant task in the selection of rice in the Russian Far Eastern rice-growing zone, since the duration of the vegetation period is the main limiting factor in the region. Mediumand late-ripening forms, although more productive, often do not reach the full maturity phase. Early ripening varieties, as a rule, are less productive. Despite a certain negative relationship between productivity and precocity, it is necessary to select precisely these properties of rice plants.Methods. In the work, 157 samples of the updated rice collection Oryza sativa L. from 22 countries were studied. Varieties Primorsky 29 and Dolinny were used as control. Rice was sown in 2022 in a growing area in 1.54 m2 pots filled with soil. Each sample was placed in rows with row spacing of 15 cm, 10–12 plants in a row (randomized) in double repetition. Standard biometric measurements were taken. The sample size of each sample was 5–10 plants in replication. A total of 2194 plants were analyzed in the work.Results. Based on the first year results studying of the rice collection in the Primorsky Krai conditions, 39 accessions were identified that exceeded the standards in terms of main panicle grain mass and/or plant grain mass. Four of them exceed both standards in productivity (UkrNIS 9706, UkrNIS 3455, DON 7790, Nika Zulanzon). Nine early maturing accessions were identified with a vegetation period of 101–106 days, which is 2–8 days lower than the standards, which retained the productivity of panicles and plants at the control level (Zeravshanika, Onne Mochi, Mu 07-980, Mu-07-1055, Ussur, Uzros 24-24, No. 24, Kascade, Long Jing 15). Samples No. 24 are superior in main panicle grain mass, Mu 07-980 in grain mass of both control plants.