Title: Study of stability and adaptability of rice promising lines in regional yield trials
Author: Alireza Nabipour
Multi-location and multi-year experiments are used for evaluating the yield and agronomic characteristics of rice lines and assessment of their adaptability and yield stability. Seven promising lines, from crosses between Iranian (Tarom Mahalli, Domsiah, Dasht, Rashti Sard) and imported rice cultivars, along with Tarom mahalli and Shiroudi (check cultivars) were planted under a randomized complete block design at Amol, Babol, and Tonekabon rice research stations in 2018 and 2019. Combined ANOVA analysis suggested that genotypes had significant effects on all of the studied traits. A comparison of means showed that Shroudi with 6198 kg/ha had the highest yield among the genotypes, followed by a15, a12, and a12 with yields of 5737, 5494, and 5469 kg/ha, respectively. The least days from sowing to 50% flowering were related to a7 (85.8 days), Tarom mahalli (89.6 days), and a4 (91.6 days). The length of the panicle was highest (43cm) in the early line a7, which had outstandingly longer panicles than the other genotypes. Results of stability analysis showed that a4 has consistently been stable based on different stability parameters. Based on its optimum height, high and stable yield, earliness, and good grain quality, a4 was selected for further field experiments and to be released as a new cultivar.
Keywords: Rice, Adaptability, Yield stability, Grain Quality, Pure lines