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Photosystem I in low light-grown leaves of Alocasia odora, a shade-tolerant plant, is resistant to fluctuating light-induced photoinhibition

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Abstract

When intact green leaves are exposed to the fluctuating light, in which high light (HL) and low light (LL) alternate, photosystem I (PSI) is readily damaged. This PSI inhibition is mostly alleviated by the addition of far-red (FR) light. Here, we grew Alocasia odora, a shade-tolerant species, at several light levels and examined their photosynthetic traits in relation to the fluctuating light-induced PSI inhibition. We found that, even in the absence of FR, PSI in LL-grown leaves was resistant to the fluctuating light. LL leaves showed higher chlorophyll (Chl) contents on leaf area basis, lower Chl a/b ratios, lower cytochrome f/P700 ratios, and lower PSII/PSI excitation ratios assessed by the 77 K fluorescence. Also, P700 in the HL phase of the fluctuating light was more oxidized. The results of the regression analyses of the PSI photoinhibition to these traits indicate that the lower electron flow rate to P700 and more excitation energy transfer to PSI protect PSI in LL-grown leaves. Both of these contribute oxidization of P700 to the efficient quencher form P700+. These features may be common in LL-grown shade-tolerant species, which are often exposed to strong sunflecks in their natural habitats.

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Abbreviations

CEF-PSI:

Cyclic electron flow around PSI

FL:

Fluctuating light

FR:

Far-red

HL:

High light

LED:

Light-emitting diode

LL:

Low light

PPFD:

Photosynthetic photon flux density

Y(I):

Effective quantum yield of PSI

Y(II):

Effective quantum yield of PSII

Y(NA):

Acceptor-side limitation of PSI

Y(ND):

Donor-side limitation of P700

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Acknowledgements

We thank Professor S. Akimoto for helpful discussions. We are analyzing chlorophyll protein complexes with Drs. A. Watanabe, E. Kim and R. Tokutsu and Professor J. Minagawa (National Institute for Basic Biology, Okazaki, Jalan). We also thank anonymous reviewers and the editor, Dr. Alonso Zavafer, for critical comments. IT knows Professor W.S. Chow since 1985 and would like to sincerely celebrate his great academic achievement. IT is honoured to have published several papers including one in this special issue with Professor Chow and Dr. R. Oguchi.

Funding

This work was partly supported by Japan Society for the Promotion of Science (JSPP) KAKENHI grants to IT (17H05718 and 19H04718).

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Correspondence to Masaru Kono.

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The authors declare no conflicts of interest associated with this manuscript.

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Terashima, I., Matsuo, M., Suzuki, Y. et al. Photosystem I in low light-grown leaves of Alocasia odora, a shade-tolerant plant, is resistant to fluctuating light-induced photoinhibition. Photosynth Res 149, 69–82 (2021). https://doi.org/10.1007/s11120-021-00832-4

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  • DOI: https://doi.org/10.1007/s11120-021-00832-4

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