Heterosis among populations of maize (Zea mays L.) with different levels of exotic germplasm |
| |
Authors: | J Crossa C O Gardner R F Mumm |
| |
Institution: | (1) International Center for Maize and Wheat Improvement (CIMMYT), Apartado Postal 6-641, 006600 Mexico DF, Mexico;(2) Department of Agronomy, University of Nebraska, 68583 Lincoln, NE, USA;(3) Biometrics and Information Systems Center, University of Nebraska, 68583 Lincoln, NE, USA |
| |
Abstract: | Summary Thirteen maize (Zea mays L.) populations including five adapted, five adapted x exotic, two composites of adapted and exotic, and one exotic selected for adaptability were crossed in a diallel mating system. The parents and 78 crosses and nine check hybrids were evaluated for grain yield and plant height in five environments. The Gardner-Eberhart model Analysis II indicated that additive and nonadditive gene effects accounted for 60 and 40% of the total variation among populations, respectively, for grain yield and 86% and 14% of the total variation, respectively, for plant height. Components of heterosis were significant in the combined analysis for both traits. Adapted Corn Belt populations tended to have higher performance in crosses and greater values of variety heterosis than 50% adapted populations. Nebraska Elite Composite, Corn Belt x Mexican, and Corn Belt x Brazilian showed high mean yields in crosses, however, they were not among those with high estimates of variety heterosis. One exotic population (Tuxpeno x Antigua Grupo 2) and three adapted populations 307 Composite, NB(S1)C-3, and NK(S1)C-3] might be combined together to form a high-yielding population. It may be possible to synthesize two useful populations for reciprocal recurrent selection by grouping Tuxpeno x Antiqua Grupo 2, NB(S1)C-3, and NS(FS)LFW-8 into one population and NK(S1)C-3, KrugxTabloncillo, and 307 Composite in the other one.Contribution from the Department of Agronomy, University of Nebraska, Lincoln, NE 68583. Published as Paper No. 8011. Journal Series, Nebr. Agric. Exp. Station. Research was conducted under Project 12-049 |
| |
Keywords: | Unadapted germplasm Adapted germplasm Heterotic patterns Gardner-Eberhart model Composites |
本文献已被 SpringerLink 等数据库收录! |
|