Mecanismos de control del consumo de agua de tres líneas tropicales de maíz (zea mays, l.) y sus híbridos derivados en ambientes contrastantes por el régimen térmico e hídrico

68. AHUMADA, N.; NAVARRETE, R.; MADDONNI, G. A.

Rosario

Congreso; X Congreso Nacional de Maíz; 2014

AIANBA

Maize production is negatively affected by abiotic stresses such as heat stress and water stress. Although it has been investigated the effect of both stresses separately during different ontogenetic stages of maize cycle, little is known about the effect they would generate when they have occurred together. In this study we analysed the effects of these stresses during the first half of the stem elongation period of 3 tropical maize lines and two derived hybrids. Measurements of water consumption, biomass production, deepening rate of roots and water use efficiency (i.e., WUE) were recorded. Water consumption of crops during the heating period was higher (108 mm) than those of the non-heated crops (65.97 mm) as well as the rate of deepening roots (4.53 and 3.56 cm d-1 for the heated- and the non-heated crops; respectively), whereas the highest WUE was attained by the non-heated crops (2.26 and 5.57 g m-2 mm-1 for the heated- and the non-heated crops; respectively). Biomass production was depressed by heat stress and water stress, and significant effects were only detected in both hybrids. For these genotypes a synergistic effect of both stresses on biomass production was recorded.