Abstract

REBOLLOZA-HERNANDEZ, Hermes et al. Phenotyping and selection of S₁ segregant inbred maize lines tolerant to hydric stress. Biotecnia [online]. 2020, vol.22, n.3, pp.20-28.  Epub Feb 10, 2021. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v22i3.1130.

Corn is susceptible to drought; a solution strategy is to generate tolerant lines from a segregating population to obtain hybrids or synthetic varieties, so the objectives were to select high yield and short ASI lines based on the irrigation-drought system, to estimate heritability and correlation of quantitative traits. The crossing of the Ac7643 × B39 lines, derived in 193 S1, lines which, together with witness and parents, were evaluated under the alpha-lattice design in a 14 × 14 arrangement with two repetitions in two locations in Morelos, Mexico. The variables were flowering male (MF) and female (FF), anthesis-silking interval (ASI), plant height (HP) and cob (HC), as well as grain yield (GY). We observed a 40 % reduction in GY under drought (0.75 t ha-1) with respect to the irrigation environment (1.26 t ha-1). The ASI was five and two days in drought and irrigation environments, respectively. The heritability for GY and ASI was 0.41. There are lines with transgressive inheritance for GY and ASI. The correlation of the GY with FF and ASI was -0.23 ** and -0.37 **, respectively. The germplasm can generate a synthetic variety or drought tolerant hybrids.

Keywords : Characterization; ASI; grain yield.

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