Allelopathic potential of extracts the from marine macroalga Plocamium brasiliense and their effects on pasture weed

Revista Brasileira de Farmacognosia

Cavalcanti, Diana N.¹  Embrapa, Belém, Brazil¹  Fonseca, Rainiomar Raimundo da¹  Sousa Filho, Antonio Pedro da Silva¹  Ortiz-Ramírez, Fredy A.¹  Ramos, Carlos José B.¹  Teixeira, Valéria L.¹  Universidade Federal Fluminense, Brazil¹ 

关键词: allelopathy;    germination;    inhibition;    Plocamium brasiliense;    halogenated monoterpenes;    weeds;   

DOI  :  10.1590/S0102-695X2012005000065

来源: Sociedade Brasileira de Farmacognosia

【 摘 要 】

Four extracts from the marine red alga Plocamium brasiliense (Greville) M.A.Howe & W.R.Taylor were prepared to identify and characterize their potential allelopathic effects on seed germination, radicle elongation and hypocotyl development of the weeds Mimosa pudica L. and Senna obtusifolia (L.) Irwin & Barneby. The four extracts were prepared in a sequence of solvents of increasing polarity: n-hexane, dichloromethane, ethyl acetate and ethanol/water (7:3). The germination bioassay was carried out at 25 °C with a 12 h photoperiod and the radicle elongation and hypocotyl development at 25 °C with a 24 h photoperiod. The dichloromethane extract showed inhibitory effects on seed germination of both plants (35 and 14%, respectively, in M. pudica and S. obtusifolia), radical germination (52 and 41.7%, respectively) and hypocotyl development (17.1 and 25.5%, respectively). Given the high sensitivity of this parameter to the potential allelopathic effects and the insufficient number of references found in the literature, these results are expected to stimulate new tests with other species of marine algae. Given the high sensitivity of the method for the detection of allelopathic potential, the species P. brasiliense emerges as a possible source of allelopathic substances against weed species. The results are attributed to the chemical composition, especially in relation to the presence of halogenated monoterpenes.

【 授权许可】

Unknown