Análise do padrão de crescimento de duas variedades de feijão jugo - vigna subterrâneo, em condições de stress hídrico

Abstract

The present study was carried out in the greenhouse belonging to the Department of Biological Sciences in Maputo, between the months of January and April 1999, with a biweekly sampling frequency. The objectives of this work were: to analyze the growth pattern and drought resistance mechanisms of two varieties of common bean (Vigna subterranean) under water stress conditions. The plants were subjected to two treatments, the control plants were regularly watered with running water and those under water stress were watered only when the volumetric water content reached about 3%. Sampling consisted of a destructive analysis of 8 plants for each treatment. The growth pattern and drought resistance mechanisms were analyzed based on fresh and dry weights and the record of the number and area of ​​leaves, number of nodules and pods, for all parts of the plant (leaf, stem, root and green beans). Fresh weights were determined by weighing immediately after harvest and dry weights were determined after drying for at least 24 hours in a drying oven at 80°C. The two varieties showed differences in the growth pattern which may be linked to different drought resistance strategies. The parameters related to drought resistance mechanisms in the two varieties were: high root weight, high root weight ratio, leaf area and leaf water content. (TRADUÇÃO NOSSA)