期刊
PHOTOSYNTHESIS RESEARCH
卷 119, 期 3, 页码 339-354出版社
SPRINGER
DOI: 10.1007/s11120-014-9969-8
关键词
Barley; Chlorophyll a fluorescence; Photoinhibition; Sun and shade leaves; Electron transport; PSII excitonic connectivity
资金
- Slovak Research and Development Agency [APVV-0197-10]
- European Community [26220220180]
In this study, we have compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes during their entire growth period, under field conditions. Analyses were based on measurements of both slow and fast chlorophyll (Chl) a fluorescence kinetics, gas exchange, pigment composition; and of light incident on leaves during their growth. Both the shade and the sun barley leaves had similar Chl a/b and Chl/carotenoid ratios. The fluorescence induction analyses uncovered major functional differences between the sun and the shade leaves: lower connectivity among Photosystem II (PSII), decreased number of electron carriers, and limitations in electron transport between PSII and PSI in the shade leaves; but only low differences in the size of PSII antenna. We discuss the possible protective role of low connectivity between PSII units in shade leaves in keeping the excitation pressure at a lower, physiologically more acceptable level under high light conditions.
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