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Alteracoes no ambiente luminoso provocam mudancas adaptativas nas plantas, na tentativa de manter o seu crescimento e desenvolvimento. Objetivou-se com esta revisao investigar e descrever o efeito do ambiente luminoso no crescimento e desenvolvimento de forrageiras de clima tropical em sistemas silvipastoris. A compreensao da influencia do ambiente luminoso e, das mudancas biologicas que as diferentes intensidades do sombreamento podem causar nas forrageiras de clima tropical, possibilita fundamentar as alteracoes metabolicas das respostas das plantas na tentativa de se manterem persistentes em sistemas sombreados. A partir disso, entender quais sao os niveis aceitaveis de radiacao para que os sistemas de producao sombreados nao entrem em colapso e fundamental para que tomadas de decisoes sejam realizadas no tempo habil do ciclo biologico das especies vegetais. Em sistemas silvipastoris, a reducao da luz incidente em forrageiras de clima tropical provoca alteracoes como aumento da area foliar especifica, reducao na densidade populacional de perfilhos e na relacao raizes: parte aerea da planta. Cada especie ou cultivar apresenta caracteristicas adaptativas especificas ao sombreamento com a finalidade de aproveitar os recursos disponiveis em tecidos fotossinteticos e de suporte. No entanto, ainda assim o sombreamento intenso (>40%) afeta negativamente a producao forrageira de acordo com a variabilidade climatica.Palavras-chave: adaptacao morfofisiologica; fotossintese; luz; plantas C4. EFFECT OF THE LIGHT ENVIRONMENT IN TROPICAL CLIMATE FORAGES IN SILVOPASTORAL SYSTEMS ABSTRACT:  Changes in the light environment cause adaptive changes in plants, to maintain their growth and development. The aim of this review is to investigate and describe the light environment effect on the growth and development of tropical forages in silvopastoral systems. The understanding of the influence of the light environment and the biological changes that different shading intensities can cause in tropical forages, makes it possible to substantiate the metabolic alterations of plant responses to remain persistent in shaded systems. From this, understanding what are the acceptable levels of radiation so that the systems do not collapse is essential for decision-making to be carried out in a timely manner in the plant's biological cycle. In silvopastoral systems, a light incidence reduction on tropical forages causes changes such as an increase in the leaf area index, reduction in the tiller population density, and shoot: root ratio. Each species or cultivar has adaptive characteristics specific to shading to take advantage of the resources available in photosynthetic and support tissue. However, even so, the intense shading (> 40%) negatively affects forage production according to climatic variability.Keywords: morphophysiological adaptation; photosynthesis; light; C4 plants.

EFEITO DO AMBIENTE LUMINOSO EM FORRAGEIRAS DE CLIMA TROPICAL EM SISTEMAS SILVIPASTORIS