Silva C B, Rondon J N, Souza P F, Oliveira A M R, Santos G O, Kulik J D, Lima C P, Kerber V A, Dias J F G, Zanin S M W, Miguel O G, Miguel M D
Departamento de Farmácia, Universidade Federal do Paraná, Curitiba, PR, BR.
Departamento de Biologia, Universidade Católica Dom Bosco, Campo Grande, MS, BR.
Braz J Biol. 2015 Aug;75(3):565-73. doi: 10.1590/1519-6984.16513. Epub 2015 Aug 25.
Urochloa decumbens (Stapf) R. D. Webster (Poaceae) is an exotic species with has spread rapidly through the Cerrado area of Pantanal, Mato Grosso do Sul, Brazil. It has covered the soil aggressively turning it into cultivated pastures. Thus, it has become a challenge to protect native areas due its capacity of exclusion of native species. It has been observed that Microlobius foetidus (Jacq.) M.Sousa & G.Andrade species (Fabaceae) shows a dominant pattern over the development of U. decumbens. This work shows that M. foetidus interfere on the natural growth of U. decumbens within 10 m ratio. Between 15 and 20 m, it was observed an increase of Importance Value index (IVI) and Relative cover (RC) values. It was also observed a variation on the antioxidant defense system of U. decumbens within 10m ratio from M. foetidus. The enzymes superoxide dismutase, catalase and peroxidase present higher levels of activity then those found for glutathione reductase. This data indicates that M. foetidus may have an effect on U. decumbens, increase the activity of antioxidant enzymes. This effect probably happens as means to neutralize the toxic effects of the oxygen generated due to the presence of allelochemicals, which increases oxidative stress.
俯仰马唐（Urochloa decumbens (Stapf) R. D. Webster，禾本科）是一种外来物种，已迅速蔓延至巴西马托格罗索州潘塔纳尔湿地的塞拉多地区。它大肆覆盖土壤，将其变成人工牧场。因此，因其排挤本地物种的能力，保护原生区域已成为一项挑战。据观察，恶臭微叶豆（Microlobius foetidus (Jacq.) M.Sousa & G.Andrade，豆科）在俯仰马唐的生长过程中呈现出优势格局。这项研究表明，恶臭微叶豆在10米范围内会干扰俯仰马唐的自然生长。在15至20米之间，观察到重要值指数（IVI）和相对盖度（RC）值有所增加。还观察到，在距恶臭微叶豆10米范围内，俯仰马唐的抗氧化防御系统存在变化。超氧化物歧化酶、过氧化氢酶和过氧化物酶的活性水平高于谷胱甘肽还原酶。这些数据表明，恶臭微叶豆可能对俯仰马唐有影响，会增加抗氧化酶的活性。这种影响可能是为了中和由于化感物质的存在而产生的氧气的毒性作用，而这种毒性作用会增加氧化应激。
