Segregation of a number of quantitative traits in the rice hybrid F₂ ‘Khao Hlan On × Kontakt’

Abstract

The current paper has presented the study results of the hybrid population of the second generation ‘Khao Hlan On × Kontakt’. The variety ‘Khao Hlan On’ is late-maturing, small-grained, fast-growing, of tall height, resistant to lodging, the variety ‘Kontakt’ is early-maturing, medium-grained, of low height, resistant to lodging. The purpose of the study was to analyze the inheritance of the main quantitative traits in the rice hybrid F2 ‘Khao Hlan On × Kontakt’ and select the best forms for breeding. In the course of genetic analysis, there have been determined the features of traits’ inheritance that affect productivity; there have been selected the best plants with an average height, with vertical panicles and mean grain weight. The study was carried out on the fields of the EP “Proletarskoe” (the Rostov Region) in 2022. For all the studied traits, there have been established the monogenic differences between the parental varieties. According to plant height, there was a partial domination of the lower values of the trait (hp = –0.22). According to panicle length, there was a partial negative dominance of the trait (hp = –0.35). According to the trait ‘number of spikelets per panicle’, there was a partial dominance of a smaller value of the trait (hp = –0.19). According to 1000-grain weight, there was a partial negative dominance (hp = –0.26). There have been selected the best morphotype F2 forms, which according to our earlier study, differed in optimal plant height, panicle length, number of spikelets per panicle, and 1000-grain weight.

Keywords

• rice
• inheritance
• genes
• quantitative traits
• segregation