Variability of traits and their correlation in different rice genotypes in dynamically changing climate conditions

Tatyana N. Lotochnikova, Ruslan R. Dzhamirze, Natalya N. Chinchenko, Nadezhda V. Ostapenko

Abstract: The conditions of rice vegetation for four years (2014-2017) were analyzed. It was found that the air temperature and the sum of the effective temperatures above 15 degrees had deviations from the average multiyear in different phases of growth and development. But on the whole they contributed to the normal formation of rice yield. In experiments on rice breeding in a competitive trial, fi ve new rice varieties were studied in comparison with the universal variety Rapan in nine parameters. It is found that VNIIR 10257 signifi cantly exceeded the standard by yield (by 9.9 c/ha). Variability of yields by years was average (CV = 12.9-21.1%). The variability of yield at the level of the standard Rapan (CV = 14%) is noted in VNIIR 10262 and VNIIR 10257. Vegetation period in the studied genotypes was characterized by low variability, both the average by experiment (CV = 3.5-6.6%), and the average annual for each variety (CV = 0.4-6.2%). The mass of 1000 grains in Rapan and VNIIR 10243 strongly correlated positively with average daily temperatures (r = 0.77 and 0.82, respectively); and in VNIIR 10257 it was negative (r = -0.80). A close high correlation of the content of head rice content with heat supply was found in Rapan and VNIIR 10262 (r = 0.84 and 0.73). The remaining varieties were characterized by moderate and low correlation of the trait. A close positive relation between head rice content and the yield is observed in VNIIR 10243 (r = 0.97). In other varieties, the connection between yield and quality is highly negative. Based on the analysis of the obtained data, VNIIR 10257 (high-yield round-grained) and VNIIR 10262 (large-grained with high technological parameters of grain and milled rice quality) were transferred to the State Variety Test (SVT). New varieties showed high productivity and have a reaction similar to the standard for the variability of the main economic-valuable traits, which gives grounds to talk about their wide adaptive capabilities.

Keywords: agroclimatic conditions; correlation; new variety; rice breeding; trait-environment; traits; variability; variability traits

Date published: 2019-08-27