Limitations to Photosynthesis in Tomato Leaves Induced by Fusarium Wilt

• The effects are reported here of inoculation with the soil-borne pathogen Fusarium oxysporum f. sp. lycopersici race 1 (FOL-1) on the photosynthetic capacity of tomato plants (Lycopersicon esculentum cv. Roma). • Plants were grown in cork compost with a pathogen concentration of c. 1× 105 cfu ml-1...

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Bibliographic Details
Published in:The New phytologist 2002-05, Vol.154 (2), p.461-470
Main Authors: Nogués, Salvador, Cotxarrera, Lurdes, Alegre, Leonor, Trillas, Maria Isabel
Format: Article
Language:English
Subjects:
Biological and medical sciences
Carboxylation
chlorophyll fluorescence
Dehydration
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Fungi
Fusarium
Fusarium oxysporum
Leaf area
Leaves
Lycopersicon esculentum (tomato)
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
photorespiration
Photosynthesis
Phytopathology. Animal pests. Plant and forest protection
Plant diseases
Plants
Quantum efficiency
vascular wilt
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Summary:• The effects are reported here of inoculation with the soil-borne pathogen Fusarium oxysporum f. sp. lycopersici race 1 (FOL-1) on the photosynthetic capacity of tomato plants (Lycopersicon esculentum cv. Roma). • Plants were grown in cork compost with a pathogen concentration of c. 1× 105 cfu ml-1, or without the fungus, for 31 d in controlled environmental chambers. Noninoculated plants were also subjected to progressive drought by withholding water. • During the first stage of disease development, FOL-1 wilt decreased the light-saturated rate of CO2 assimilation. This was accompanied by a decreases in the maximum carboxylation velocity and the capacity for ribulose-1,5-bisphophate regeneration, in the absence of any significant photodamage to PSII, and increased stomatal limitation of the CO2 supply. As the disease progressed, the maximum quantum efficiency of PSII photochemistry decreased in the leaves. FOL-1 wilt also decreased leaf area, therefore a reduction in the ability of the tomato plants to capture photosynthetically active radiation is also a major factor in determining the depression in the photosynthetic productivity of these infected plants. • The effect of the infection by FOL-1 on leaf photosynthesis was mimicked by water stress.
ISSN:0028-646X
1469-8137
DOI:10.1046/j.1469-8137.2002.00379.x