DOI: 10.1104/pp.121.4.1349. Effects of Solar Ultraviolet Radiation on the Potential Efficiency of Photosystem II in Leaves of Tropical Plants

Effects of Solar Ultraviolet Radiation on the Potential Efficiency of Photosystem II in Leaves of Tropical Plants

10.1104/pp.121.4.1349

Crossref journal-article

Oxford University Press (OUP)

Plant Physiology (286)

Abstract

Abstract The effects of solar ultraviolet (UV)-B and UV-A radiation on the potential efficiency of photosystem II (PSII) in leaves of tropical plants were investigated in Panama (9°N). Shade-grown tree seedlings or detached sun leaves from the outer crown of mature trees were exposed for short periods (up to 75 min) to direct sunlight filtered through plastic or glass filters that absorbed either UV-B or UV-A+B radiation, or transmitted the complete solar spectrum. Persistent changes in potential PSII efficiency were monitored by means of the dark-adapted ratio of variable to maximum chlorophyll a fluorescence. In leaves of shade-grown tree seedlings, exposure to the complete solar spectrum resulted in a strong decrease in potential PSII efficiency, probably involving protein damage. A substantially smaller decline in the dark-adapted ratio of variable to maximum chlorophylla fluorescence was observed when UV-B irradiation was excluded. The loss in PSII efficiency was further reduced by excluding both UV-B and UV-A light. The photoinactivation of PSII was reversible under shade conditions, but restoration of nearly full activity required at least 10 d. Repeated exposure to direct sunlight induced an increase in the pool size of xanthophyll cycle pigments and in the content of UV-absorbing vacuolar compounds. In sun leaves of mature trees, which contained high levels of UV-absorbing compounds, effects of UV-B on PSII efficiency were observed in several cases and varied with developmental age and acclimation state of the leaves. The results show that natural UV-B and UV-A radiation in the tropics may significantly contribute to photoinhibition of PSII during sun exposure in situ, particularly in shade leaves exposed to full sunlight.

Bibliography

Krause, G. H., Schmude, C., Garden, H., Koroleva, O. Y., & Winter, K. (1999). Effects of Solar Ultraviolet Radiation on the Potential Efficiency of Photosystem II in Leaves of Tropical Plants. Plant Physiology, 121(4), 1349â1358.

Authors 5

G. Heinrich Krause (first)
Claudia Schmude (additional)
Hermann Garden (additional)
Olga Y. Koroleva (additional)
Klaus Winter (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 27, 2002, 1:01 a.m.)
Deposited	4 years, 2 months ago (June 25, 2021, 5:43 a.m.)
Indexed	1 month ago (Aug. 6, 2025, 8:45 a.m.)
Issued	25 years, 9 months ago (Dec. 1, 1999)
Published	25 years, 9 months ago (Dec. 1, 1999)
Published Online	25 years, 9 months ago (Dec. 1, 1999)
Published Print	25 years, 9 months ago (Dec. 1, 1999)

Funders 0

None

BibTeX

@article{Krause_1999, title={Effects of Solar Ultraviolet Radiation on the Potential Efficiency of Photosystem II in Leaves of Tropical Plants}, volume={121}, ISSN={0032-0889}, url={http://dx.doi.org/10.1104/pp.121.4.1349}, DOI={10.1104/pp.121.4.1349}, number={4}, journal={Plant Physiology}, publisher={Oxford University Press (OUP)}, author={Krause, G. Heinrich and Schmude, Claudia and Garden, Hermann and Koroleva, Olga Y. and Winter, Klaus}, year={1999}, month=dec, pages={1349–1358} }

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