LIGHT INTENSITY AND ACTIVITY OF TRYPSIN INHIBITORS IN AMARANTH LEAVES AND SEEDS

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