INVESTIGADORES
SOBERON Jose Rodolfo
congresos y reuniones científicas
Título:
Effect of allelochemicals from a sugarcane straw on weed growth and physiological processes of Lactuca sativa
Autor/es:
SAMPIETRO, D. A.; SGARIGLIA, M. A.; SOBERÓN, J. R.; VATTUONE, M. A.
Lugar:
Santa Clara (Cuba)
Reunión:
Congreso; 3rd International Conference on Agricultural Development and Sustainability; 2005
Institución organizadora:
Universidad Central de Las Villas (Publicado en Allelopathy Journal 18 (1), vi, 2006)
Resumen:
Previous studies showed that sugarcane (Saccharum spp.) straw leachates inhibit the growth of annual weeds. The aim of this work was to identify the leachate phytotoxic constituents through a bioassay-guided isolation. The relative phytotoxic activity of the isolated compounds was evaluated on seedling growth of L. sativa and four weeds. The action of these compounds on plant physiological processes was also evaluated on L. sativa. Three compounds were identified and the structural analysis indicated that they were ferulic, syringic and vanillic acids. Vanillic acid had the strongest inhibitory effect on root elongation of the test plants followed by ferulic and syringic acids. The identified phytotoxins increased root membrane permeability, depressed root metabolic activity and reduced chlorophyll content in L. sativa. Vanillic and ferulic acids inhibited mitotic index while syringic acid increased cell division. Modification in root morphology of L. sativa seedlings pretreated with these compounds was also evaluated. Vanillic acid had a strong inhibitory effect on the elongation of primary roots and inhibited root branching. Ferulic acid stimulated root branching only at the concentration of 0.5 mM and was less inhibitory to primary root elongation. Roots pretreated with syringic acid showed a normal elongation of the primary roots and more root branching than those from control. As the leachate concentrations of the isolated compounds were high enough to produce most of the growth observed perturbations, more studies are in progress to establish the participation of these phenolic acids in the phytotoxic effects of sugarcane straw in natural conditions.
