Analysis of the inheritance of quantitative traits in the rice hybrid Kuboyar × Gagat

Abstract

Abstract. Rice is one of the main food items in the world. White rice is mainly used, but there are also varieties with red, brown and black pericarp grains. This rice is much healthier. The article is devoted to the creation of new lines of rice with black pericarp. The purpose of the work is to study the inheritance of varying quantitative traits in an interspecific hybrid of rice Kuboyar × Gagat, with subsequent selection of isolated samples. Methods. Hybridization of these varieties was carried out in 2017. Mathematical processing of research data was performed Using the program Statistica 6. For genetic analysis, the program “Polygen A” was used by A. F. Merezhko (2005). The research was conducted in 2018–2019 on the basis of a Separate division “Proletarskoe” of the Rostov region. Scientific novelty. A genetic analysis of varying quantitative traits that affect the grain productivity of rice was performed, and a number of new patterns were established. Results. Inheritance of plant height in F2 hybrids was based on the type of overdomination of large trait values. The parent forms differed in the allelic state of the two pairs of genes. Along the length of the panicle, there was a partial negative dominance and monogenic differences in crossed varieties. According to the number of spikelets on the panicle, overdomination of a larger trait value and the interaction of two pairs of genes were established. By the mass of 1000 grains, partial dominance of large values of the trait and monogenic differences in the initial parent forms were established. There was no dominance in the length of the grain, and the parent forms differed by two pairs of genes. The grain width was dominated by smaller values of the trait, splitting was performed according to the monohybrid scheme. The selection of isolated samples forming a compact erect panicle and grains with a black pericarp was carried out for further selection work.