Respostas da batata-doce à inoculação de micorriza e rizobactéria

Abstract

Considered an important crop and food base in developing countries, sweet potato [Ipomoea potatoes (L.)] is a rustic crop because it does not require high technologies, in addition to its low production cost. Its yield can be affected by abiotic factors such as water and nutritional deficiencies, and as an alternative, new sustainable technologies have been adopted that bring greater productivity and at the same time reduce environmental impacts, including inoculation with microorganisms. Therefore, this study aimed to evaluate biometric responses (leaf area and aerial and root dry mass), and biochemical (photosynthetic pigments and secondary compounds in leaves and beta carotene content in roots) in sweet potato plants inoculated with mycorrhizal fungus arbuscular - FMA (Rhizophagos clarus) and rhizobacteria (Bacillus subtilis), in isolation. Additionally, parameters of biological activity in the soil were evaluated. The experimental design was completely randomized, with 3 treatments (control, inoculation with mycorrhiza and inoculation with rhizobacteria) and 10 replications. Plants inoculated with AMF showed increases in the content of chlorophylls, carotenoids and total phenols in leaves, as well as in dehydrogenase enzyme activity and basal soil respiration. However, there was a reduction in the dry mass of adventitious and tuberous roots. The inoculation of plants with rhizobacteria did not result in differences either in the dry mass of the aerial and root parts, as well as in the biochemical parameters evaluated, with only an increase in the activity of the dehydrogenase enzyme and in the basal respiration of the soil.