Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract Full Text

Allelopathic activity of invasive species on the germination and initial development of native tree.


Invasive plants arise during ecological succession and develop along with native trees. The coexistence between these species can be influenced by several factors, such as allelopathy, defined as the set of direct or indirect changes that one plant exerts on another. Thus, the objective of this work was to identify the existence of allelopathic action on seed germination and the possible interference in the initial growth of P. rigida seedlings when submitted to aqueous extracts of B. brizantha and M. maximus. For this, a DIC was used in a 2×4 factorial scheme (species × treatments). The aqueous extract of fresh leaves of the invasive species was prepared independently, which were diluted in the proportions 2.5; 5; And 10% and distilled water (0%) was used as control. Seeds and seedlings of P. rigida were submitted to different extracts and evaluated for germination, germination speed index, root and shoot growth and dry mass weight. After analyzing the data, it was possible to verify that both extracts did not present allelopathic interference in the germination and germination speed index of P. rigida seeds, as well as in the growth of the roots of their seedlings. However, when the seedlings were submitted to the extract of M. maximus in the two higher concentrations, greater shoot growth was observed. Thus, there is no negative allelopathic interference of B. brizantha and M. maximus extracts on seed germination or on initial growth of P. rigida.