Plant productivity parameters in rice varieties with different type of panicles and their variability

To increase rice yield, scientists are considering the possibility of changing the morphological parameters of plants. At the same time, there are not enough attempts in Russia to analyze the yield potential of varieties with different panicle architectonics. The purpose of our research was a comparative analysis of rice varieties differing in panicle morphotype, by the formation of productivity elements. In the ecological conditions of the south of Russia, in 2019-2020, a series of field experiments were carried out with 24 Oryza sativa L. varieties under conditions of artificial irrigation. The results of assessing the elements of plant productivity and biological productivity of varieties differentiated into 6 groups according to the panicle type and grown on plots 1x12 m are presented. The present study showed that in the rice-growing zone of Krasnodar region, varieties with a compact inclined and slightly spreading panicle had an advantage in achieving high productivity. However, the stability of quantitative traits was exhibited by varieties with spreading panicles of the drooping type. Correlation analysis confirmed: the longer the panicle, the more spreading it is and the less sterile spikelets are formed on it. Along with other researchers, we revealed significant differences in yield between japonica and Indica varieties. Due to the cultivation of varieties under equal conditions, the variation in biological yield from 778 to 1203 g / m2 can be explained by their genotypic characteristics. For the sustainable development of rice growing in the region, our studies emphasize the importance of the diversity of varieties of various morphotypes with high potential and stability of productivity elements and provide useful information for breeding.