Resumen

MURILLO, Elizabeth; VINA, Amparo; PEREZ, Carlos A  y  RUIZ, Víctor H. Allelophatic Activity of Arvenses Associated with the Cultivation of Rice (Oryza sativa l.) in Tolima-Colombia. Inf. tecnol. [online]. 2006, vol.17, n.2, pp. 15-24. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642006000200004.

Asteraceae weed species associated with rice (Oryza sativa L.) in the state of Tolima-Colombia were gathered, identified and morphologic, pharmacognostic and bromatologically characterized. Allelopathic activity for those organic fractions of weed with high content of sesquiterpene lactone was evaluated on the germination and radicle length of O. sativa seeds in filter paper.  Both crude extract and chromatographic fractions were incubated for 120 hours at concentrations of 200, 400 and 600 ppm. Cultivation of the grainswas associated to 12 weed species which presented great variability in its morphologic characteristics and farmacognostic index. Chloroformic fractions gave significant differences with the ethanolic extract due to the effect on the cellular division and the radicle elongation of the O. sativa seeds, activity that seems to be associated to the content of sesquiterpene lactone.

Palabras llave : rice; oryza sativa L; allelopathic activity; sesquiterpene lactone; asteraceae.