Photosystem II Is More Sensitive than Photosystem I to Al3+ Induced Phytotoxicity
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- Photosystem II Is More Sensitive than Photosystem I to Al3+ Induced Phytotoxicity
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Aluminium (Al) the most abundant metal in the earth's crust is toxic in acid soils (pH < 5.5) mainly in the ionic form of Al 3+ species. The ability of crops to overcome Al toxicity varies among crop species and cultivars. Here, we report for a first time the simultaneous responses of photosystem II (PSII) and photosystem I (PSI) to Al 3+ phytotoxicity. The responses of PSII and PSI in the durum wheat ( Triticum turgidum L. cv. 'Appulo E') and the triticale (X Triticosecale Witmark cv. 'Dada') were evaluated by chlorophyll fluorescence quenching analysis and reflection spectroscopy respectively, under control (-Al, pH 6.5) and 148 μM Al (+Al, pH 4.5) conditions. During control growth conditions the high activity of PSII in 'Appulo E' led to a rather higher electron flow to PSI, which induced a higher PSI excitation pressure in 'Appulo E' than in 'Dada' that presented a lower PSII activity. However, under 148 μM Al the triticale 'Dada' presented a lower PSII and PSI excitation pressure than 'Appulo E'. In conclusion, both photosystems of 'Dada' displayed a superior performance than 'Appulo E' under Al exposure, while in both cultivars PSII was more affected than PSI from Al 3+ phytotoxicity.
Original language | English |
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Article number | 1772 |
Journal | Materials Transactions |
Volume | 11 |
Issue number | 9 |
Pages (from-to) | 1-13 |
ISSN | 1996-1944 |
DOIs | |
Publication status | Published - 2018 |
- aluminium, chlorophyll fluorescence, durum wheat, excitation pressure, non-photochemical quenching, photosynthesis, photoprotection, photoinhibition, reactive oxygen species, triticale, Reactive oxygen species, Non-photochemical quenching, Triticale, Aluminium, Chlorophyll fluorescence, Durum wheat, Excitation pressure, Photoinhibition, Photosynthesis, Photoprotection
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