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Light intensity and activity of trypsin inhibitors in amaranth leaves and seeds
Yuriko Nagamatsu López, Alejandro Blanco Labra, John Délano Frier, Eulogio Pimienta Barrios;
Revista Fitotecnia Mexicana 2004 27(2)
Resumen
Inglés Español
The effect of exposing Amaranthus hypochondriacus plants to different levels of photosynthetic photon flux densities (PPFD) during development was analyzed in this work. Mature plants exposed to full sunlight (38.8 mol m-2 d-1) had higher instantaneous rates of net CO2 uptake (An), reducing sugars content and thicker leaves, but lower chlorophyll content and leaf number per plant than those developed under reduced levels of PPFD (19.4 and 12.8 mol m-2 d-1). A physiological response to varying levels of PPFD was the differential accumulation of trypsin inhibitors in leaves and seeds. Leaves from plants grown under full sunlight conditions, showed a significantly higher trypsin inhibitor activity than leaves from plants partially shaded with plastic nets. In contrast, seeds collected from plants fully exposed to sunlight, showed the lowest level of trypsin inhibitors and higher rates of germination than seeds produced by plants exposed to the lowest level of sunlight. The capacity of A. hypochondriacus to adjust its morphology and physiology in response to light indicates ecological plasticity that might be helpful to face both biotic and abiotic stresses during their development.

Palabras clave: Amaranthus hypochondriacus Mill., flujo fotosintético de fotones, inhibidores de tripsina, intercambio de gases, clorofila, anatomía foliar, germinación de semillas.
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Universidad Autónoma del Estado de México
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