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The changes in photosynthetic characteristics of tobacco leaves in two
consecutive stages of TMV infection
Key words: Carotenoids, chlorophyll fluorescence, electron transport, Nicotiana tabacum L.,
photosynthesis
We compared two successive stages of infection by tobacco mosaic virus, the first in the stadium of
vein clearing and the second when two different regions, i.e. light- and dark- green islands in the
infected leaves were apparent and symptoms were fully developed. The chlorophyll and carotenoid
contents and ratio of chlorophyll a/b decreased with progression of infection and were the lowest in
light-green islands. The maximum quantum yield of PS 2 photochemistry F V /F M was decreased in a
row from first stage, DGI and LGI. The same is true for the ratio of quantum yields of
photochemical and concurrent non-photochemical processes in PS 2 F V /F 0 . The decrease of
effective quantum yield of photochemical energy conversion in infected leaves was not so uniform,
the highest value was observed in dark-green islands. Generally, the most marked impairment of
photosynthetic apparatus was developed in light-green islands.
Poděkování
Tyto výsledky jsou součástí grantového projektu financovaného GA ČR č. 522/02/0708.
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