Citrus limon seedlings without functional chloroplasts are unable to induce phenylalanine ammonia-lyase in response to inoculation with Alternaria alternata

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 altern...

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Bibliographic Details
Published in:Journal of plant physiology 1997, Vol.150 (6), p.645-651
Main Authors: Prieto, Humberto, Chiong, Mario, Seelenfreund, Daniela, Garrido, Jorge, Quaas, Alex, Pérez, Luz M.
Format: Article
Language:English
Subjects:
ALTERNARIA ALTERNATA
AMONIO FENILALANINA LIASA
Biological and medical sciences
BLANCHISSEMENT
BLANQUEADURA
BLEACHING
CARBON DIOXIDE
CHAMPIGNON
CHLOROPLASTE
CHLOROPLASTS
CITRON
CITRUS LIMON
CLOROPLASTO
DIOXIDO DE CARBONO
DIOXYDE DE CARBONE
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
FUNGI
HERBICIDAS
HERBICIDE
HERBICIDES
HONGOS
KOHLENDIOXIDASSIMILATION
LEMONS
LIMON ACIDO
Norfluorazon
NORFLURAZON
NORFLURAZONA
PAL
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
PHENYLALANINE AMMONIA LYASE
Phytopathology. Animal pests. Plant and forest protection
PLANTULAS
PLANTULE
PLASTE
PLASTIDIOS
PLASTIDS
RUTACEAE
SEEDLINGS
VACCINATION
VACUNACION
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Summary: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, CO 2 assimilation was not detected in NFZ-treated and etiolated seedlings, as compared to controls.
ISSN:0176-1617
1618-1328
DOI:10.1016/S0176-1617(97)80278-7