Artículo de revista
Citrus limon seedlings without functional chloroplasts are unable to induce phenylalanine ammonia-lyase in response to inoculation with Alternaria alternata
Fecha
1997-05Registro en:
JOURNAL OF PLANT PHYSIOLOGY 150 (6): 645-651
0176-1617
Autor
Prieto, Humberto
Chiong Lay, Mario
Garrido, Jorge
Seelenfreund Hirsch, Daniela
Quaas, Alex
Pérez Roepke, Luz María
Institución
Resumen
A light-dependent bleaching of plastids was induced in lemon seedlings through cultivation in the presence of the herbicide Norfluorazon (NFZ). Also, etiolated seedlings were obtained by cultivation under continuous dark conditions. When both types of seedlings were challenged with Alternaria alternata conidia, they were unable to induce phenylalanine ammonia-lyase, PAL (E.C. 4.3.1.5.). Cell ultrastructure of control seedlings showed the presence of chloroplasts, while NFZ-treated lemon seedlings showed altered chloroplasts and in etiolated seedlings only proplastids were observed. In addition, CO2 assimilation was not detected in NFZ-treated and etiolated seedlings, as compared to controls.