Resumen

LOPEZ-SANTILLAN, José Alberto et al. Biomasa acumulada e intercambio gaseoso en maíz proveniente de semilla de diferente tamaño bajo humedad favorable y restringida: (con 3 tablas). Phyton (B. Aires) [online]. 2004, vol.73, pp.243-248. ISSN 1851-5657.

The germination speed and seedling growth of maize seed of two different sizes was evaluated. To determine the differences in the biomass production during the vegetative stage from different seed size, considering the effects of humidity on seedling physiological status. A larger amount of biomass in endosperm and embryo allowed greater availability of reserves during the later stage of the germination; previous to emergency resulting in a high seedling vigor and a most accumulation of as much radical biomass as aerial during the vegetative stage, the water restriction during the germination and the vegetative stage of these plants caused a decrement of 72,6% in the aerial biomass accumulation in big and small seed plants, due to a diminution from diverse physiological processes such as stomatic conductance, transpiration and photosynthetic rate.

Palabras clave : Maize; seed size; seedling vigor; biomass; drought; gas exchange.

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