Title: Evaluation of stability analysis of rice promising lines in regional yield trials
Author: Hossein Rahimsouroush
Abstract: One of the main goals of the rice breeding program in Iran is to improve high-yielding and stable genotypes across environments. This experiment was carried out to determine the yield stability of six promising rice genotypes and two check varieties, Shirodi and Hashemi in a randomized complete block design with 3 replications in two locations of Rasht and Tonekabon in 3 years and nine-month. Simple ANOVA of yield showed considerably significant differences among genotypes in six trials. Bartlett test confirmed the uniformity of experimental errors (χ2= 4.79). The F test for combined ANOVA was calculated based on the mathematical expectation of mean squares since the factors of location and genotype were fixed and the factor of year was random. The result showed that there were significant differences among genotypes and locations. The effects of year and genotype×year were not significant. While the interactions of year×location and year×location×genotypes were significant. The yield stability was evaluated through within location variance and coefficient of variability (C.V.) by Lin and Binns Method. The results showed that genotypes 19401 and 19403 had the highest stability and shortest growth period (101 and 103 days up to 50% flowering) among promising lines. The grain cooking quality characteristics for 19401 and 19403 genotypes were good with 23.30% and 21.35% of amylose content and 3.80 and 3.450 of gelatinization temperature. In addition, these genotypes with an average total yield of more than 6000 Kgha-1 had suitable plant height, panicle length, number of the fertile tillers,s, and plant type. Therefore, these two genotypes were selected as the most stable promising lines with high-yield and desirable agronomic and grain cooking quality traits for cultivation in Mazandaran and Guilan regions.
Keywords: Rice, stability, genotype, adaptability, yield