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Título: | Iron deficiency interrupts energy transfer from a disconnected part of the antenna to the rest of Photosystem II |
Autor: | Moise, Nicolae; Quílez Marín, Rebeca CSIC; Abadía Bayona, Anunciación CSIC ORCID ; Abadía Bayona, Javier CSIC ORCID ; Moya, Ismael | Palabras clave: | Iron deficiency Energy transfer Ch1 fluorescence induction Phase fluorometry Photosystem II efficiency Time-resolved chlorophyll fluorescence Sugar beet |
Fecha de publicación: | 1-nov-2001 | Editor: | Kluwer Academic Publishers | Citación: | Photosynthesis Research 70 (2): 207-220 (2001) | Resumen: | Iron deficiency changed markedly the shape of the leaf chlorophyll fluorescence induction kinetics during a dark-light transition, the so-called Kautsky effect. Changes in chlorophyll fluorescence lifetime and yield were observed, increasing largely the minimal and the intermediate chlorophyll fluorescence levels, with a marked dip between the intermediate and the maximum levels and loss of the secondary peak after the maximum. During the slow changes, the lifetime-yield relationship was found to be linear and curvilinear (towards positive lifetime values) in control and Fe-deficient leaves, respectively. These results suggested that part of the Photosystem II antenna in Fe-deficient leaves emits fluorescence with a long lifetime. In dark-adapted Fe-deficient leaves, measurements in the picosecond-nanosecond time domain confirmed the presence of a 3.3-ns component, contributing to 15% of the total fluorescence. Computer simulations revealed that upon illumination such contribution is also present and remains constant, indicating that energy transfer is partially interrupted in Fe-deficient leaves. Photosystem II-enriched membrane fractions containing different pigment-protein complexes were isolated from control and Fe-deficient leaves and characterized spectrophotometrically. The photosynthetic pigment composition of the fractions was also determined. Data revealed the presence of a novel pigment-protein complex induced by Fe deficiency and an enrichment of internal relative to peripheral antenna complexes. The data suggest a partial disconnection between internal Photosystem II antenna complexes and the reaction center, which could lead to an underestimation of the Photosystem II efficiency in dark-adapted, low chlorophyll Fe-deficient leaves, using chlorophyll fluorescence. | Versión del editor: | http://dx.doi.org/10.1023/A:1017965229788 | URI: | http://hdl.handle.net/10261/99818 | DOI: | 10.1023/A:1017965229788 | Identificadores: | doi: 10.1023/A:1017965229788 issn: 0166-8595 e-issn: 1573-5079 |
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