Articles

Effects of different temperatures and water stress in germination and initial growth of creole genotypes of maize from three different agroclimatic regions of San Luis Potosí (México)


Abstract


Most of the studies on the effects of climate change on maize have been carried out on grain yield; few have been centred on germination and growth. In this investigation, experiments were carried out at different temperatures and water stress to evaluate the germination and initial growth of 12 creole maize genotypes from different agroclimatics regions of San Luis Potosí. The temperatures were 20, 25, 30 and 35 °C, proposed for having relation with the scenarios of temperature increase due to climate change in San Luis Potosí. The simulation of the water stress was carried out by the use of PEG-8000 (-0.5, -1 and -1.5 MPa), a control (0 MPa) was used. Four repetitions
of 25 seeds for each creole genotype were carried out under a design at random with factorial arrangement. Germination and initial growth of the genotypes were negatively affected by the increase of temperature and decrease of water stress. Also these results were depended by the genetics materials origins and the climatic characteristics of each agroclimatic region of the state. In addition, the genotypes from less conditions of stress (Huasteca) were the most affected in comparison to materials from unfavorable conditions for the growth of maize
plants (regions Altiplano and Media). Results suggest that the particular conditions of each region has influenced in the dynamic of germination and growth. We concluded, the related effects of climate change have affected differently and negatively the germination and initial growth of early maize from different agroclimatic regions.


Keywords

abiotic stress, drought, heat, climate change, polyethyleneglycol

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013