Phytochemical screen of extracts Brachiaria brizantha and Megathyrsus maximus and their effects on germination and development of Parapiptadenia rigida (Benth.) Brenan

Abstract

Allelopathy is recognized as an important ecological mechanism that influences plant dominance and succession through the action of chemicals released by plants into the environment. This study aimed to identify allelochemical groups and the existence of the allelopathic potential of Brachiaria brizantha and Megathyrsus maximus in Parapiptadenia rigida seeds and seedlings. Hexane, ethyl acetate and methanolic extracts were prepared for phytochemical screening and germination bioassays. Aqueous extracts at concentrations of  10 %, 5 % and 2.5 % were prepared and applied monthly to P. rigida plants. Although allelochemical groups were identified in the extracts, they did not interfere with P. rigida seed germination. The aqueous extracts also did not show allelopathic potential in the development of P. rigida.