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Photosynthetic parameters of sexually different parts of Porphyra katadai var. hemiphylla (Bangiales, Rhodophyta) during dehydration and re-hydration

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Abstract

Physiological data from extreme habitat organisms during stresses are vital information for comprehending their survival. The intertidal seaweeds are exposed to a combination of environmental stresses, the most influential one being regular dehydration and re-hydration. Porphyra katadai var. hemiphylla is a unique intertidal macroalga species with two longitudinally separated, color distinct, sexually different parts. In this study, the photosynthetic performance of both PSI and PSII of the two sexually different parts of P. katadai thalli during dehydration and re-hydration was investigated. Under low-grade dehydration the variation of photosystems of male and female parts of P. katadai were similar. However, after the absolute water content reached 42%, the PSI of the female parts was nearly shut down while that of the male parts still coordinated well and worked properly with PSII. Furthermore, after re-hydration with a better conditioned PSI, the dehydrated male parts were able to restore photosynthesis within 1 h, while the female parts did not. It is concluded that in P. katadai the susceptibility of photosynthesis to dehydration depends on the accommodative ability of PSI. The relatively lower content of phycobiliprotein in male parts may be the cause for a stronger PSI after severe dehydration.

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Abbreviations

AWC:

The absolute water content of the thalli

ETRI:

Relative rates of photosynthetic electron transport of PSI

ETRII:

Relative rates of photosynthetic electron transport of PSII

F 0 :

The minimal fluorescence yield

F m :

The maximum fluorescence yield

F m′ :

The maximum fluorescence yield in illuminated samples

FR:

Far red light

F v/F m :

Optimum quantum yield

P700:

The reaction center of PSI

PAR:

Photosynthetic active radiation

PPF:

Photosynthetic photon flux

PSI:

Photosystem I

PSII:

Photosystem II

qL:

Photochemical quenching

RLC:

Rapid light curve

SP:

Saturation pulse

W 0 :

Wet weight of the thalli

W d :

Dry weight of the thalli

W t :

Weight of the thalli after a particular time of dehydration

YI:

Effective PSI quantum yield

YII:

Effective PSII quantum yield

Y(NA):

Nonphotochemical quantum yield of PSI caused by acceptor side limitation

Y(ND):

Nonphotochemical quantum yield of PSI caused by donor side limitation

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (30830015), Project for Supporting the National Development (No. 2006BAD09A04) and the 863 Project of China (Nos. 2006AA10A402, 2007AA09Z406, 2006AA05Z112, 2006AA10A413).

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Correspondence to Guang-Ce Wang.

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Lin, AP., Wang, GC., Yang, F. et al. Photosynthetic parameters of sexually different parts of Porphyra katadai var. hemiphylla (Bangiales, Rhodophyta) during dehydration and re-hydration. Planta 229, 803–810 (2009). https://doi.org/10.1007/s00425-008-0874-2

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  • DOI: https://doi.org/10.1007/s00425-008-0874-2

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