Características fisiológicas e bioquímicas de plantas de soja [Glycine max (l.) merrill] sob condições de hipoxia

Abstract

The soils in the floodplain of Rio Grande do Sul occupy 20% of the area of the state and are being pursued with the cultivation of rice. The problem is the difficult adaptation of crops with economic return for this, looking up, species that use the same infrastructure and high performance. The soybean culture appears as an option and displays genetic variability to allow the excess moisture in the soil. The experiment was conducted in a greenhouse in pots containing a substrate as albaqualf, collected in a area previously cultivated with rice. The experimental design was randomized blocks, in a factorial scheme (2x5x2), consisting of two soybean cultivars (FT-Abyara, CD 202), five duration of flooding the soil (0; 2; 4; 6 and 8 days of hypoxia) and two times (V4 and R1), with three replications. In order to assessments of tolerance of soybean cultivars in flooded soils. The flooding was applied in V4, keeping them for up to eight days and recovery valued at R1. It wasevaluated the morphological attributes, fresh and dry weight of organs and levels of ureides in the xylem sap and total proteins in nodules and roots, as well as contents of chlorophyll pigments and stomatal resistance and transpiration. The data were submitted to statistical analysis. It is concluded that there was difference in response between the two cultivars in most parameters assessed in relation to periods of hypoxia and post-hypoxia. Cultivar FT-Abyara has a better performance against the flooding when compared with the CD 202.