Open Access

Two international nurseries with stress adaptive traits —1st SATYT (1st Stress Adaptive Trait Yield Trial) and 5th SATYN (Stress Adaptive Trait Yield Nursery)— were evaluated in five locations of Mexico (Baja California, Guanajuato, Jalisco, Sinaloa and Sonora) during the 2015-2016 cycle under full irrigated conditions. These trials included 45 and 35 genotypes with two replicates. Agronomic traits, yield and yield components were measured. For 1st SATYT, the combined variance analysis showed highly significant differences for sites across all measured traits. The highest yields were observed in Sonora and Baja California with 6,615 and 6,367 kg ha-1, respectively. The most productive genotype (45) was Reedling #1, the check provided by CIMMYT breeding programs, which had an average yield across locations of 6,999kg ha-1 . The new genotypes selected for their high yield in this trial were lines 27 (SOKOLL/3/PASTOR//HXL7573/2*BAU/4/ATTILA/PASTOR), 12 (SOKOLL/WBLL1), 8 (PUB94.15.1.12/ WBLL1) and 11 (SOKOLL/WBLL1). Line number 8 derives from a cross with a Mexican landrace. For 5th SATYN, the highest yield was observed in Sonora, while the lowest was recorded in Guanajuato. As with the previous nursery, line 45 (REEDLING #1) was the highest yielding genotype, followed by line 19 (205) // BORL95 / 3 / PRL / SARA // TSI / VEE # 5/4 / FRET2. The genotypes selected in this trial were 19 (WBLL4//OAX93.24.35/WBLL1/5/ CROC_1/ AE.SQUARROSA), 21 (PASTOR // HXL7573/2*BAU/3/WBLL1), 18 WBLL4//OAX93.24.35/ WBLL1 /5/CROC_1/AE.SQUARROSA) and 20 (PASTOR // HXL7573/2*BAU/3/ WBLL1), which had the highest yields across locations. Although the overall performance of the PT lines in comparison with local checks was good, the fact that these lines were selected specifically for stress adaptive traits (such as heat and drought) and evaluated under yield potential conditions did not allow them to express their maximum advantage in comparison with check Reedling #1.

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