Allelopathic effects of aqueous extracts of Leucaena leucocephala (Lam) of Wit. on lettuce (Lactuca sativa L.) seeds

• DOI: 10.22533/at.ed.2431903126

• Palavras-chave: Alelopatia, plantas, teste de germinação.

• Keywords: Allelopathy, plants, germination test.

• Abstract:

  In their search for resources

  for its growing and development, the plants

  make interactions with other beings and the

  environment, the allelopathic effect is one

  form of interference related to the secondary

  metabolites. The aim of this study was to assess

  the allelopathic effects of aqueous extracts

  parts of Leucaena (Leucaena leucocephala

  (Lam) de Wit.) on the germination of lettuce

  (Lactuca sativa L.). The parts of Leucaena

  collected originated extracts with differents

  concentrations, using distilled water as the

  control treatment. Germination percentage

  (%G), speed of germination index (SGI), mean

  germination time (MGT, in days) and mean

  germination speed (MGS, in days), were

  analyzed. The completely randomized factorial

  design, composed of five concentrations (0%,

  25%, 50%, 75%, 100%) of the extracts (factor 1)

  and three parts of Leucaena (leaves, fruits peels

  and seeds) (factor 2), with four replicates of 20

  seeds each. Was made analysis of variance and

  the means were compared by the Tukey test

  at 95% of probability and regression analysis.

  No interactions were observed between the

  concentrations and the different parts of

  Leucaena for the %G. The fruit peel extracts

  in 75% and 100% reduced SGI and increase

  MGT. Leaf and fruit peels extracts at 100%

  concentration reduced the MGS. The regression

  analyzes presented high correlations of the seed

  extracts in relation to %G and extracts of leaves

  and fruit peels in relation to SGI, MGT and

  MGS. Therefore, aqueous extracts of Leucaena interfere in the germination of lettuce

• Número de páginas: 15