Pesquisa Agropecuária Brasileira
On-line version ISSN 1678-3921
ALVES, Maria da Conceição Sampaio; MEDEIROS FILHO, Sebastião; INNECCO, Renato and TORRES, Salvador Barros. Allelopathy of plant volatile extracts on seed germination and radicle length of lettuce. Pesq. agropec. bras. [online]. 2004, vol.39, n.11, pp. 1083-1086. ISSN 1678-3921. http://dx.doi.org/10.1590/S0100-204X2004001100005.
The objective of this work was to identify allelopathic effects of volatile extracts of essential oils on germination and radicle length of lettuce seedlings. Five concentrations were utilized for each oil (0.0, 0.001, 0.01, 0.1 and 1.0%, v/v) arranged into a completely randomized design with four replicates of 25 seeds. The volatile extracts of essential oils of cinnamon, alecrim-pimenta, capim-citronela and alfavaca-cravo revealed allelopathic potentialities on lettuce seed germination and radicle growth, effect which varied according to the oil concentration. The volatile extract of Jaborandi essential oil stimulates radicle growth and does not inhibit lettuce seeds germination, which is characterized as a beneficial allelopathic effect.
Keywords : Lactuca sativa; Cinnamomum zeylanicum; Lippia sidoides; Cymbopogon citratus; Ocimum gratissimum; Pilocarpus microphyllus.