Photosynthetic parameters of sexually different parts of <Emphasis Type="Italic">Porphyra katadai</Emphasis> var. <Emphasis Type="Italic">hemiphylla</Emphasis> (Bangiales,Rhodophyta) during dehydration and re-hydration |
| |
Authors: | A-Peng Lin Guang-Ce Wang Fang Yang Guang-Hua Pan |
| |
Institution: | (1) Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;(2) Graduate School, The Chinese Academy of Sciences, 100039 Beijing, China;(3) College of Marine Science and Engineering, Tianjin University of Science & Technology, 300457 Tianjin, China |
| |
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. |
| |
Keywords: | Chlorophyll fluorescence Desiccation-tolerant Effective quantum yield Electron transport rate P700+ absorbance Porphyra |
本文献已被 SpringerLink 等数据库收录! |
|