Estimation of genotype and environment interaction and compatibility of promising breeded rice lines in Mazandaran

Rice breeding with genetic background of Iranian cultivars provides an opportunity to improve these cultivars that have high adaptability to the environment and favorable marketability. Therefore, seven promising lines, orginiated from cross combinations of Iranian and exotic rice genotypes, along with two check varieties including Tarom-Mahali and Shiroudi were evaluated in four experimental fields in Mazandaran provinces located in east zone (Behshahr), centre (Babol), west (Tonekabon) and Rice Research Instutute (Amol) in a randomized complete block design (RCBD) with three replicates during 2016-2017 (totally eight environments). Results of simple variance analysis showed that there were significant differences between genotypes for number of days to 50% of flowering, plant height, number of fertile tillers and grain yield. Combined analysis variance indicated that the effect of genotype and interaction effects of year and location and also year and location and genotype on grain yield were siginificant. G5 genotype had the highest yield in all environments and G1 genotype was in the second place in terms of yield. Stability analysis through AMMI method indicated that rice promising line G5 (DAH, originated from cross between Dasht and Ahlami-tarom) showed high of grain yield (5888.7 Kg/ha in average) and performed stable situation over environments, G1 genotype (AHS, a cross between Ahlami-tarom and Sepidroud) with 5312.1 Kg grain yield /ha in average, showed moderate stability in most of the environments.