INVESTIGADORES
ISLA Maria Ines
artículos
Título:
Plant growth inhibitors isolated from sugar cane (Saccharum officinarum) straw.
Autor/es:
SAMPIETRO D.A., VATTUONE M.A., ISLA M.I.
Revista:
JOURNAL OF PLANT PHYSIOLOGY
Editorial:
Elsevier
Referencias:
Lugar: Europa; Año: 2006 vol. 97 p. 837 - 846
ISSN:
0176-1617
Resumen:
Several compounds related with plant defense and pharmacological activities have been isolated from sugar cane. Straw phytotoxins and therir posible mechanisms of growth inhibition are largely unknown. A bioassay-guided fractionation of the phytotoxic constituents leachated from sugar cane straw led to the isolation of trans-ferulic (trans-FA), cis-ferulic (cis-FA), vainillic (VA) and syringic (SA) acids. The straw leachates and their identified constituents significantly inhibited root growth of lettuce and tour weeds. Va was more phytotoxic to root elongation than FA and SA. The identified phenolic compounds significantly increased leakage of root cell constituents, inhibited dehydrogenase activity and reduced chlorophyll content in lettuce. VA and FA inhibited mitotic index while SA increased cell division. Additive (VA-FA and FA-SA) and synergistic (VA-SA) interactions on root growth were observed at the response level of EC25. Although the isolation compounds differed in their relative phytotoxic activities, the observed physiological responses suggest that they have a common mode of action.HPLC análisis indicated that sugar cane straw can potentially release 1.43 (ratio 2:1, trans:cis), 1.14 and 0.14 mmolKg-1 (straw dry weight) of FA, VA and SA, respectively. As phenolic acids are often found spatially establish the impacto f these compounds in natural setting.