Leaf and Root Allelopathic Potential of the Vernonanthura brasiliana

Abstract

The Brazilian native weed assa-peixe (Vernonanthura brasiliana) is considered one of the main invasive plant species of pasture areas in the Amazon. It is thus necessary to know their biology and their behavior in the environment, and to enhance the development of management strategies, minimizing the use of herbicides. The objective of this study was to test the allelopathic effect on the germination and growth of the bioindicator species Lactuca sativa from leaf and root extracts obtained from fresh and dry V. brasiliana. The experiment consisted of six treatments with concentrations of 0, 12.5, 25, 50, 100, and 200 mg mL-1, using four replicates per treatment. The evaluated parameters were: germination percentage, first count, germination speed index, and shoot and root length. The aqueous extract of fresh V. brasiliana roots caused an allelopathic effect on all evaluated parameters, while the dry root extract only affected the germination speed index. Root growth inhibition and growth stimulation of lettuce seedlings were verified when submitted to dry and fresh root extracts. Extracts of V. brasiliana caused an allelopathic effect on the species Lactuca sativa L., where the aqueous extracts of dry leaves and fresh roots were the most influential.

Aspectos do potencial alelopático do extrato aquoso das folhas de Mimosa ramosissima Benth, na germinação e crescimento inicial de Panicum maximum cv. aruana e Amaranthus retroflexus L.

“…Diversas pesquisas realizadas com diferentes extratos e plantas testes constataram que o sistema radicular tende a reagir diferente do sistema aéreo, esses trabalhos confirmaram que o aumento da concentração do extrato provoca diminuição do crescimento do sistema radicular (Silveira et.al, 2014;Franco;Poletto, 2014;Nishimuta et. al, 2019;Oliveira, et.al, 2019).…”

Chemical Characterization and Leishmanicidal Activity In Vitro and In Silico of Natural Products Obtained from Leaves of Vernonanthura brasiliana (L.) H. Rob (Asteraceae)

“…belongs to the list of plants of interest to the public health system. V. brasiliana , popularly known as “assa-peixe”, is endemic to the Brazilian Cerrado (Brazilian Savannah) biome but can be found in other biomes due to its cosmopolitan and pantropical aspect [ 17 , 18 , 19 , 20 ]. It belongs to the Asteraceae family, the tribe Vernonieae , with more than 1000 species cataloged in the tribe.…”