Chlorophyll a fluorescence signatures of nitrogen deficient barley leaves
1993
Hak, R. (Karlova Univ., Prague (Czech Republic). Prirodovedecka Fakulta) | Rinderle-Zimmer, U. | Lichtenthaler, H.K. | Natr, L.
Primary leaves of barley (Hordeum vulgare) plants, growing either in complete (H) or nitrogen deficient nutrition (H-N), were subjected to complex chlorophyll (Chl) a fluorescence measurement after an 8 or 14 d cultivation period. The fluorescence spectra of H-N plants exhibited a higher ratio of the two maxima F690/F735, caused predominantly by drastic decrease in Chl content. The ratio of Chl to carotenoids (a+b/x+c) decreased considerably in H-N leaves. In spite of high Rfd values (ratio of fluorescence decrease) in H-N leaves, indicating high efficiency of photochemical energy conversion, quenching analysis of H-N leaves showed a significantly higher coefficient of non-photochemical quenching, qNP (i.e. higher proportion of heat loss). Fast fluorescence kinetics indicated slower reoxidation of primary quencher (QA) in H-N leaves.
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