期刊
PHOTOSYNTHETICA
卷 58, 期 2, 页码 497-506出版社
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.32615/ps.2019.166
关键词
absorptance; chlorophyll fluorescence; manganese cluster; photodamage; spinach; two-photon excitation; microscopy
资金
- BioSolar Cells open innovation consortium - Dutch Ministry of Economic Affairs, Agriculture and Innovation
- Australian Research Council [DP120100872]
- National Council of Science and Technology of Mexico (CONACYT)
- Mexican Secretariat of Public Education (SEP)
- Hungarian Academy of Sciences [PREMIUM-2017-38]
- National Research, Development and Innovation Office [NKFI FK 128977]
Generally, excessive excitation absorbed by the pigments is considered the cause of PSII photodamage. Previous studies of action spectra of PSII photodamage concluded that shorter wavelengths induce more damage, supporting the hypothesis of the existence of more than one photosensitizer. However, the relative influence of different photosensitizers is still inconclusive. In this work, we have revisited this question by inducing PSII photodamage in vivo and in vitro at two different wavelengths (460 and 660 nm) where the net absorption cross section was the same using equal irradiance. To correlate PSII photodamage with each wavelength band, we followed its time course using the OJIP transient of the chlorophyll fluorescence to determine the possible contributions of photoinhibition by different photosensitizers. We found evidence that at least two sites of photoinactivation of PSII exist.
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