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In order to determine the adaptation of bread wheat genotypes, 27 promising lines were studied along with cultivars: Chamran2, Mehregan and Sarang, three commercial cultivars as controls, in six experimental field stations; Zabol, Ahwaz, Darab, Dezful, Iranshahr, Khorramabad, for two successive cropping seasons (2019–21), using Alpha Lattice with four replications. These lines were also studied for their reaction to major diseases in known hot spots for Yellow Rust (YR), Leaf Rust (LR), Septorios etc. in special diseases nurseries, under natural and artificial inoculating conditions. Analysis of variance was performed to study the main effects of genotypes (G), year (Y), location (L) as well as the interaction between these factors. To study the adaptation and yield stability (rank method, mean and standard deviation of rank (R and SDR) mean yield and Pi stability index were used. Lines with higher grain yield, high adaptability and yield stability, desired agronomic performance and tolerance/resistance to major diseases in southern warm and dry zone were identified. five of the new lines were superior to Chamran 2, Sarang and Mehregan, the trial checks, with a mean grain yield of 5071 Kg/ha, 5352 Kg/ha, and 4924 Kg/ha, mean Ranks of 17.7, 12.7, & 19.1, Standard Error of Rank 8.4, 5.73, & 10.61, Yield Ratio Index of 98, 1.3 & 95, respectively. Therefore, five promising lines including S-98-11, S-98-22, S-98-26 and S-98-28 with mean grain yield of 5496, 5433, 5493 and 5623 respectively, were selected for evaluation in on-farm conditions.
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