Effects of Cold-Hardening on Chilling-Induced Photoinhibition of Photosynthesis and on Xanthophyll Cycle Pigments in Sweet Pepper

2001 ◽  
Vol 39 (3) ◽  
pp. 467-472 ◽  
Author(s):  
Peng Liu ◽  
Qing-Wei Meng ◽  
Qi Zou ◽  
Shi-Jie Zhao ◽  
Qing-Zhong Liu
Keyword(s):  
Xanthophyll Cycle ◽  
Sweet Pepper ◽  
Cold Hardening ◽  
Photoinhibition Of Photosynthesis ◽  
Xanthophyll Cycle Pigments

In situ study of photoinhibition of photosynthesis and xanthophyll cycle activity in plants growing in natural gaps of the tropical forest

1998 ◽  
Vol 25 (2) ◽  
pp. 189 ◽  
Author(s):  
A. Thiele ◽  
G.H. Krause ◽  
K. Winter
Keyword(s):  
Chlorophyll A ◽  
Xanthophyll Cycle ◽  
Fluorescence Emission ◽  
D1 Protein ◽  
Barro Colorado Island ◽  
Slow Phase ◽  
Photoinhibition Of Photosynthesis ◽  
Total Carotenoids ◽  
Lowland Forest

Photoinhibition of photosynthesis was studied in situ in leaves of several species of plants growing in natural treefall gaps of a tropical lowland forest (Barro Colorado Island, Panama). Leaves showed several features typical of sun-acclimation: relatively high pools of total carotenoids and xanthophyll cycle pigments and high ratios of chlorophyll a to b. During 1–2 h periods of exposure to direct mid-day sun, all leaves experienced substantial photoinhibition as indicated by a marked decline in the ratio of variable to maximum chlorophyll a fluorescence emission, FV/FM, detected after 10 min of dark adaptation. After return to shade, these ‘dark-adapted’ FV/FM ratios increased with biphasic kinetics, similar to previous findings under controlled conditions in the laboratory. A phase lasting about 1 h accounted for most of the recovery of FV/FM and was followed by a slow phase which proceeded until sunset. The decline in FV/FM during photoinhibition and the fast phase of recovery correlated closely with the amounts of zeaxanthin in the leaves. Given the small portion of the second recovery phase which has previously been attributed to turnover of the D1 protein in Photosystem II, high xanthophyll cycle activity in these gap leaves is probably responsible for the major part of photoinhibition, providing an efficient energy dissipation pathway during periods of high sunlight exposure.

scholarly journals Glutathione and zeaxanthin formation during high light stress in foliose lichens

2008 ◽  
Vol 53 (No. 8) ◽  
pp. 340-344 ◽  
Author(s):  
J. Štepigová ◽  
H. Vráblíková ◽  
J. Lang ◽  
K. Večeřová ◽  
M. Barták
Keyword(s):  
Xanthophyll Cycle ◽  
Light Exposure ◽  
Light Stress ◽  
High Light ◽  
Short Term ◽  
Xanthophyll Cycle Pigments ◽  
High Light Stress ◽  
Fluorescence Label ◽  
Thiol Binding ◽  
Pure Acetone

In the presented study, we describe techniques for glutathione and pigment determination in lichens used in our laboratory. Glutathione and xanthophyll cycle pigments, especially zeaxanthin, are important antioxidants protecting plants against various stresses. In our laboratory, the high light stress in lichens has been intensively studied for several years. We extract glutathione in HCl and determine it by thiol-binding fluorescence label monobromobimane. For pigment determination, homogenized lichen thalli are extracted with pure acetone. According to our results, the total amount of glutathione decreases after a short-term high light exposure, while the amount of zeaxanthin increases.

scholarly journals Evidence for the absence of enzymatic reactions in the glassy state. A case study of xanthophyll cycle pigments in the desiccation-tolerant moss Syntrichia ruralis

2013 ◽  
Vol 64 (10) ◽  
pp. 3033-3043 ◽  
Author(s):  
Beatriz Fernández-Marín ◽  
Ilse Kranner ◽  
María San Sebastián ◽  
Unai Artetxe ◽  
José Manuel Laza ◽  
...  
Keyword(s):  
Xanthophyll Cycle ◽  
Glassy State ◽  
Enzymatic Reactions ◽  
Xanthophyll Cycle Pigments
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