Photosynthetica 1997, 33(11):151-156 | DOI: 10.1023/A:1006833816920

Modulation of photosystem 2 reactions mediated by aluminium toxicity in Zea mays

F.C. LIDON1, J.C. RAMALHO2, M.G. BARREIRO3, J.A. LAURIANO4
1 Plant Biology Unit, Faculdade de Ciéncias e Tecnologia, Universidade Nova de Lisboa, Monte da Caparica, Portugal
2 Instituto de Investigação Cientifìca Tropical-CEPTA, Tapada da Ajuda, Lisboa Codex, Portugal
3 Plant Physiology Department, Estação Agronómica Nacional, Quinta do Marqués, Oeiras, Portugal
4 Faculdade de Ciéncias Agrárias, Universidade Agostinho Neto, Huambo, Angola

Two weeks old maize (Zea mays L. cv. XL-72.3) plants were submitted to 0 to 81 g m-3 Al for 20 d in a growth medium of low ionic strength. The increasing Al concentrations sharply increased chlorophyll (Chl) concentrations. The rates of photosystem 2 activities (H2O→DCPIP and DPC→DCPIP) increased at 9 g(Al) m-3 but at higher Al doses they decreased again. A slight decrease of qE and qN coupled to an increase of qP was also observed until the 27 g m-3 Al. The Al-induced decline in cytochrome (cyt) b contents per Chl unit was parallel for the b559LP and cyt b559HP forms, but on a leaf area basis more or less opposite trend in both these cyt forms was observed. Increased Al concentrations also decreased carotene and zeaxanthin contents.

Additional key words: Al; carotenoids; chlorophyll; fluorescence induction; Hill reaction; maize; singlet oxygen

Prepublished online: January 1, 1998; Published: January 1, 1997  Show citation

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LIDON, F.C., RAMALHO, J.C., BARREIRO, M.G., & LAURIANO, J.A. (1997). Modulation of photosystem 2 reactions mediated by aluminium toxicity in Zea mays. Photosynthetica, 34(1), 151-156. doi: 10.1023/A:1006833816920
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