IBR   13079
INSTITUTO DE BIOLOGIA MOLECULAR Y CELULAR DE ROSARIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
AQUEOUS EXTRACTS FROM PLANTS WITH PHYTOTOXIC ACTIVITY
Autor/es:
TRAVAINI, M. L.; CARRILLO, N; SOSA, G.; CECCARELLI, E. A.
Lugar:
Mendoza
Reunión:
Congreso; XLVIII Reunión Anual de la Sociedad Argentina de Investigación Bioquímica y Biología Molecular; 2012
Institución organizadora:
Sociedad Argentina de Investigación Bioquímica y Biología Molecular
Resumen:
The
extensive use of synthetic herbicides directed against a limited number of
targets to control weeds has accelerated the rate of appearance of resistance
among them. The use of new substances with different sites of action would
reduce that problem. In that sense, we propose the use of phytotoxic compounds
isolated from plants. Several known vegetal species release germination and/or growth
inhibitors as a strategy to colonize or invade grounds occupied by other
plants. We collected samples (organs and surrounding soil) of plants that
exhibited an invasive behaviour in different regions of Argentina. We also
harvested plants popularly known for their medicinal use. A total of 2103
samples were processed. Aqueous extracts were obtained from each sample and their
inhibitory activities tested in assays of lettuce and agronomic seeds
germination. We detected that 251 extracts inhibited lettuce germination at
100%. Moreover, 4 extracts were selected because they showed the lowest IC50 (below
3 mg/mL) when tested for lettuce germination inhibition and produced also a
post germination effect. Longer exposures of the seeds to these extracts
produced an increase on inhibition of lettuce germination and growth. Particularly,
the effect on germination was irreversible: after an exposition of seeds to
these 4 extracts normal levels of germination were never recovered.