Different weed species presenting aggressiveness in the field, competing for resources, interfering on the crops development due to the association between competition and allelopathic compounds. Vernonia polyanthes is a cerrado's species that is widely spread by cerrados. This species is in process of recolonization under agricultural fields located on cerrado. The insertion of V. polyanthes in these fields are resulting in monetary loses by the farmers. So, the objectives of this project are: 1 - Elucidate the degree of interference imposed by Vernonia polyanthes on the germination and initial development of Glycine max and Urochloa decumbens; 2 - Investigate if the interference imposed by V. polyanthes on the crops has allelopathic contribution; 3 - Evaluate if abiotic stresses increasing the interferences of V. polyanthes on G. max and U. decumbens; 4 - Investigate how much plastic is the metabolism (metabolomic approaches) of V. polyanthes submitted by biotic and abiotic stresses. To this, we are proposing the following experiments: 1 - Study of the allelopathic potential of V. polyanthes; 2 - Contributions of the abiotic stresses on the allelopathic potential of V. polyanthes on germination and initial development of G. max and U. decumbens, 3 - Effects of decomposition of V. polyanthes leaves on germination and initial development of G. max and U. decumbens; 4 - Root exudation of V. polyanthes on germination and initial development of G. max and U. decumbens; 5 - Relative competitiveness between V. polyanthes and G. max, V. polyanthes and U. decumbens. Such studies may helpful determining the most effective strategy to control this species, causing low environmental impacts reducing the loses of production. We also believe, in the future, will be possible the use some of these identified compounds as natural herbicides.
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