Chlorophyll a fluorescence gives information about the plant physiological status due to its coupling to the photosynthetic electron transfer chain and to the further biochemical processes. Environmental stresses, which acts synergistically, disturbs the photosynthesis. The OJIP test, elaborated by Strasser and co-workers, enables comparison of the physiological status of plants grown on pollut...

Chlorella vulgaris was grown under super high illumination (7000 μmolPhotonPAR/m2/s). Continuous and flashing light patterns were applied to investigate potential gain originating from the effect (square pattern, duty cycle of 0.5). Three control configurations tested, all continuous light: 200 μmolPhotonPAR/m2/s (conventional cultivation conditions), 4000 (about same average amount energy), 70...

the changes of chl a fluorescence induction curve in response to different salinity levels in canola (barassica napus, l.) plants were investigated. the canola seedlings were exposed to salt stress (100 mm and 200 mm nacl) for 7 days and chl a fluorescence induction kinetics was analysed. by using the ojip-test, various parameters like vj, area, n, φpo, φeo, ψo, rc/abs and piabs were calculated...

Trees in urban areas provide important ecosystem services and are an essential element of green space. The constant increase artificial light from anthropogenic activities around the world creates photopollution that affects phenology physiology plants. Here we conducted a field study to investigate impacts on six trees (Saraca asoca, Terminalia catappa, Bauhinia variegata, Holoptelea integrifo...

Plant drought tolerance depends on adaptations of the photosynthetic apparatus to changing environments triggered by water deficit. The seedlings three Brassica crops differing in sensitivity, oleracea L. var. capitata—white cabbage, acephala—kale, and rapa pekinensis—Chinese were exposed withholding water. Detailed insight into machinery was carried out when seedling reached a relative content...

Chlorophyll a fluorescence is a highly sensitive, non-destructive, and reliable tool for measuring, rather quickly, photosynthetic efficiency, particularly of Photosystem II (PSII), the water-plastoquinone oxidoreductase. We briefly review here the connection between the fast (up to 2 s) chlorophyll fluorescence rise and PSII, as well as the empirical use of the fluorescence rise kinetics in un...