Photosynthetica 2005, 43(4):597-602 | DOI: 10.1007/s11099-005-0093-z

Photosynthesis in leaves of Nicotiana tabacum L. infected with tobacco mosaic virus

N. Wilhelmova1,*, D. Prochazkova1, M. Sindelarova1, L. Sindelar1
1 Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Prague 6, Czech Republic

In tobacco leaves inoculated with tobacco mosaic virus (TMV), changes in chlorophyll (Chl) and carotenoid contents, parameters of slow Chl fluorescence kinetics, i.e. the maximum quantum yield of photosystem (PS2) photochemistry Fv/Fm, the effective quantum yield of photochemical energy conversion in PS2 Φ2, ratio of quantum yields of photochemical and concurrent non-photochemical processes in PS2 Fv/F0, non-photochemical quenching (NPQ), and photochemical activities of isolated chloroplasts from systemically infected tobacco leaves were investigated. We compared two successive stages of infection, the first in the stage of vein clearing at 9th day post inoculation (dpi) and the second at 22nd dpi when two different regions, i.e. light- (LGI) or dark-green (DGI) islands in the infected leaf were apparent and symptoms were fully developed. These two different regions were measured separately. The Chl and carotenoid contents in infected leaves decreased with a progression of infection and were lowest in LGI in the second stage. Also the ratio of Chl a/b declined in similar manner. The maximum quantum yield of PS2 photochemistry Fv/Fm, was decreased in the following order: first stage, DGI, and LGI. The same is true for the ratio Fv/F0. The decrease of Φ2 in infected leaves declined as compared to their controls. On the contrary, NPQ increased in infected leaves, the highest value was found in the first infection stage. Photochemical activities of the whole electron transport chain in isolated chloroplasts dramatically declined with the progression of symptoms, the lowest value was in LGI. Similarly, but to a lesser extent, the activity of PS2 in isolated chloroplasts decreased in infected leaves. Generally, the most marked impairment of the photosynthetic apparatus was manifested in the LGI of infected leaves.

Additional key words: carotenoids; chlorophyll; chlorophyll fluorescence; electron transport; photosynthetic efficiency; photosystem 2; tobacco

Received: December 16, 2004; Accepted: June 7, 2005; Published: December 1, 2005  Show citation

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Wilhelmova, N., Prochazkova, D., Sindelarova, M., & Sindelar, L. (2005). Photosynthesis in leaves of Nicotiana tabacum L. infected with tobacco mosaic virus. Photosynthetica, 43(4), 597-602. doi: 10.1007/s11099-005-0093-z
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