EFECTO DE LA SEQUÍA SOBRE ALGUNAS VARIABLES HÍDRICAS Y MORFOMÉTRICAS EN CINCO GENOTIPOS DE AMARANTHUS

Abstract

The effect of the drought was evaluated on water and morphometric variables in Amaranthus caudatus, A. cruentus and A. hypochondriacus, races Azteca, Mercado and Nepal during the flowering state grown in greenhouse. It was determined relative water content (RWC), concentration of prolina in leaf and root, leaf area, number of leaves and partition of biomass. It was observed that A. cruentus and A. hypochondriacus race Azteca cultivated in drought, showed a significant diminution at the 14:00 hours in RWC. All the genotypes worked in drought showed significant increases in the concentration of prolina in root; in leaves, only races Azteca and Nepal denoted a significant increase. The foliar area except A. caudatus, showed a significant diminution in all the genotypes worked in drought. In the number of leaves, only races Azteca and Nepal showed a significant reduction. Considering the partition of biomass A. caudatus was the less sensible specie to the drought. The integrated analysis of the studied variables indicated that A. caudatus and A. hypochondriacus, race Nepal were the species with minor and major susceptibility to the drought respectively.