TY - JOUR AU - Preciado-Ortiz, Ricardo Ernesto AU - Terrón-Ibarra, Arturo Daniel AU - Gómez-Montiel, Noel AU - Robledo-González, Edgar Iván PY - 2005/09/17 Y2 - 2024/03/28 TI - Genetic components of maize heterotical contrasting tropical and subtropical populations. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 16 IS - 2 SE - Articles DO - 10.15517/am.v16i2.11867 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/11867 SP - 145-151 AB - <p>A diallelic cross</p><p>between 16 tropical and subtropical populations was formed</p><p>at Iguala, Gro., in the winter nursery 2002 - 2003. Crosses</p><p>and parents were evaluated during the 2003 growing season</p><p>at INIFAP Bajío Experimental Station, in Celaya, Gto,</p><p>Mexico. The objective was to identify the best populations to</p><p>support the heterotic structure in our breeding program and as</p><p>sources to derived new inbred lines. Data were analyzed</p><p>using the Gardner and Eberhart model, in which variance</p><p>components can be separated to estimate additive and nonadditive</p><p>genetic effects. Results showed that despite the</p><p>heterotic response involved in the formation of the</p><p>populations, the “tropical x subtropical” heterotic pattern was</p><p>expressed in specific combinations such PABG T x Sint “B”</p><p>IG and Sint PABG I ACG x Sint “A” IG, with grain yields of</p><p>12.5 and 12.4 t/ha respectively. These crosses presented</p><p>maximum values of specific heterosis which can be used for</p><p>developing high-yielding hybrids through reciprocal</p><p>recurrent selection. Tropical population Sint “A” IG</p><p>presented the highest varietal effect, and because of its good</p><p>adaptation in the subtropic is considered an outstanding</p><p>germplasm to be incorporated in the Bajío Maize Breeding</p><p>Program. The best value of varietal heterosis, which is an</p><p>indicator of General Combining Ability, was observed in</p><p>PABG I GH “A” synthetic which can be used as tester. More</p><p>detailed analysis will permit to take advantage of the</p><p>germplasm involved to benefit maize breeding programs.</p> ER -