Evaluation of water-tolerant maize synthetics derived from waterlogging-tolerant native corn varieties
2017
Heredia, M.C.C. | Blanco, N.A. | Sanchez, Ma.A.B. | Ladia, N.A.Jr. | Laude, T.P. | Paril, J. | Salazar, A.M. | Ocampo, E.T.M.
Synthetic populations from native corn inbreds with possible adaptation to water stress paved the way to the development of stress tolerant varieties. The first synthetic population was formed by inter-mating 10 white S1 native corn lines that are waterlogging tolerant. The second population was developed by inter-mating 5 colored S1 maize lines. Balanced bulk from the ears produced from both populations was planted to comprise the base population of the two waterlogging tolerant populations. Two hundred seven of these synthetic lines were screened for waterlogging tolerance under field conditions in Sta. Barbara, Pangasinan [Philippines] Grain yield (at 14% seed moisture), number of plants with adventitious roots, average number of adventitious roots per plant, date to tasseling, stand count after waterlogging or flooding, number of ears, ear length, ear diameter, fresh weight and absolute grain weight significantly different among lines. Grain yield ranged from nil to 3.69 t/ha. Correlation among the agronomic characters with the yield of the maize synthetics were mostly positively linear. Genetic variation for yield, number of plants with adventitious roots, number of ears, ear weight and grain weight were higher compared to the other characteristics. These differences are expected to be adequate to discriminate the waterlogging tolerant from the susceptible synthetic lines. From those results, another trial was set-up using the same protocol, excluding only the determination of the leaf color. The top ten waterlogging tolerant lines were identified and correlation between grain color and waterlogging tolerance were determined.
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