TOLERÂNCIA FISIOLÓGICA DE PLANTAS DE SOJA SUBMETIDAS A DIFERENTES NÍVEIS DE DÉFICIT HÍDRICO INOCULADAS COM FUNGOS micorrizícos arbusculares

Abstract

This work aimed at the physiological performance of soybean plants, associated with AMF Gigaspora margarita and Gigaspora gigantea under three water levels. Soil collection was carried out in the area of ​​the IF Goiano – Campus Rio Verde and chemical analysis and liming were carried out. As inoculated in the furrow of plants G. margarita of the margarita and 46 g of G. gigantea, were grown in a greenhouse under natural light conditions with RH and an average temperature of 28 °C. The control of water content was performed using an irrigation model, model 10 HS (METER, Inc. USA), after a field capacity sensor gravimetric method. The water deficit was when the plants reached the V3 stage, divided into three groups: 80, 60 and 40% of CC. At first sight, the plants were re-irrigated 80% after two days and until the ones presented CC again. Soybean plants inoculated with AMF G. margarita and G.

gigantea showed plants with photosynthetic pigments, spore density and mycorrhizal colonization equal to or greater than plants without inoculation. These results developed that plants inoculated with AMF had greater tolerance to water deficit due to the contribution of fungi. The data obtained showed that the greater the deficit, the greater the response to AMF inoculation. Therefore, inoculation with AMF G. margarita and G. gigantea maximizes soybean development under water deficit conditions.