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- Title
Photosynthetic activity of Gloiopeltis furcata (intertidal red macroalga) in response to desiccation.
- Authors
LIU Hong-liang; LI Xue-meng; NAN Guo-ning; ZHANG Quan-sheng
- Abstract
In this study, the diurnal change of photosynthesis activity in response to various tidal patterns, the relationship between photosynthetic activity and tissue water content, and the interactive effect of desiccation and irradiance on photosynthetic activity in Gloiopeltis furcata were investigated by using portable pulse amplitude modulated (PAM) fluorometer. Results showed that Fv / Fm decreased more rapidly during the noon low tide than during the morning- or evening low tide. Fv / Fm decreased slowly at the beginning of desiccation during the morning low tide, but decreased rapidly throughout the evening low tide. Fv / Fm recovered to the initial values on the same day no matter when the low tide occurred, suggesting the occurrence of dynamic photoinhibition. These features endowed G. furcata with an ability to adapt to the periodic desiccation on high intertidal rocks. The maximum (Fv / Fm) and effective (ΦPSII) quantum yield declined with the decrease of tissue water content (TWC). However, photosynthetic activity could recover completely when TWC exceeded 6%, showing a strong ability of G. furcata to tolerate desiccation. The relationships between TWC and Fv / Fm and ΦPSIIwere as follows: Fv / Fm = 0. 68+(0. 0044-0. 68) / [1+(TWC / 66. 96)5], R2 =0. 99; ΦPSII=0. 585+(0. 004-0. 585) / [1+(TWC / 73)10 ], R2 =0. 99. ANOVA result further showed that the interactive effect of irradiance and desiccation on photosynthetic activity was significant, and that the photoinhibition degree increased with elevation of irradiation and duration of desiccation. The extreme condition (6 h desiccation at 1000 μmol photons·m-2·s-1) resulted in a serious photoinhibition, with the longest period of complete recovery for photosynthesis activity.
- Subjects
GLOIOPELTIS; SPECTRAL irradiance; PLANT photoinhibition; PHOTOSYNTHESIS; PHOTOELECTRONS
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2014, Vol 25, Issue 5, p1491
- ISSN
1001-9332
- Publication type
Article