|Y. Ibaraki, J. Murakami
|chlorophyll fluorescence, distribution pattern, quantum yield, stress factor
Chlorophyll fluorescence parameter Fv/Fm, which is the ratio of variable to maximum fluorescence after dark-adaptation, represents maximum quantum yield of PSII. The parameter has begun to be used for detecting stress in plants.
In this study, Fv/Fm distribution pattern was analyzed in plants under various stress conditions in order to obtain basic knowledge for identifying the stress factor.
Seedlings of cabbage (Brassica oleracea L.) with several leaves, grown in soil pots outside, were set under various stress conditions including water stress, high-light stress, and high temperature stress. Fv/Fm was measured for leaves of different ages in individual plants using a pulse amplitude modulation fluorometer once a day for several days after the stress treatments were imposed.
The distribution patterns of Fv/Fm within the plants varied with days after the stress treatments were imposed, while the pattern in control plants did not change.
Different stress factors produced different patterns of change of Fv/Fm in individual plants.
These results suggest that the Fv/Fm distribution pattern in an individual plant may change according to the stress factor imposed, and that analyzing the Fv/Fm distribution pattern may be an effective way of identifying stress factors.
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