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Photosynthetic performance in Antarctic lichens with different growth forms reflect the diversity of lichenized algal adaptation to microhabitats

【标题】Photosynthetic performance in Antarctic lichens with different growth forms reflect the diversity of lichenized algal adaptation to microhabitats

【Title】Photosynthetic performance in Antarctic lichens with different growth forms reflect the diversity of lichenized algal adaptation to microhabitats

【DOI】10.1515/popore−2015−0012

【作者】 曹叔楠; 张洁; 郑宏元; LIU Chuanpeng; 周启明

【Author】 Cao Shunan ; Zhang Jie ; LIU Chuanpeng ; Zhou Qiming

【期刊】POLISH POLAR RESEARCH

【Journal】POLISH POLAR RESEARCH

【期刊年份】2015

【卷】36

【期】2

【关键词】 Antarctic, lichens, lichenized, molecular phylogenetics, photosynthesis, Trebouxia

【Keywords】 Antarctic, lichens, lichenized, molecular phylogenetics, photosynthesis, Trebouxia

【摘要】Lichens, as typical obligate associations between lichenized fungi and their photosynthetic partners, are dominant in Antarctica. Three Antarctic lichens, Ochrolechia frigida, Umbilicaria antarctica, and Usnea aurantiaco−atra with different growth forms, were sampled nearby the Great Wall Station, King George Island. Molecular data revealed that the photosynthetic algae in these three lichens were Trebouxia jamesii. The net photo− synthesis (Pn) of three individuals from these species, together with environmental factors such as light and temperature, were recorded by CO2 gas exchange measurements using a CI−340 portable photosynthetic system in situ. Differences between T(leaf) (the tempera− ture of the thalli) and T(air) (the air temperature) for these lichens were not consistent, which reflected that environment and the growth form of thalli could affect T(leaf) signifi−cantly. Strong irradiation was expected to have adverse effects on Pn of Ochrolechia frigida and Umbilicaria antarctica whose thalli spread flat; but this photoinhibition had little effect on Usnea aurantiaco−atra with exuberant tufted thallus. These results indicated that photo−synthetic activity in lichens was affected by the growth forms of thalli besides microhabitat factors. One species of lichenized alga could exhibit diversified types of photosynthetic behavior when it was associated with various lichenized fungi in different microhabitats. It will be helpful for understanding how lichens are able to adapt to and colonize in extreme environments.

【Abstract】Lichens, as typical obligate associations between lichenized fungi and their photosynthetic partners, are dominant in Antarctica. Three Antarctic lichens, Ochrolechia frigida, Umbilicaria antarctica, and Usnea aurantiaco−atra with different growth forms, were sampled nearby the Great Wall Station, King George Island. Molecular data revealed that the photosynthetic algae in these three lichens were Trebouxia jamesii. The net photo− synthesis (Pn) of three individuals from these species, together with environmental factors such as light and temperature, were recorded by CO2 gas exchange measurements using a CI−340 portable photosynthetic system in situ. Differences between T(leaf) (the tempera− ture of the thalli) and T(air) (the air temperature) for these lichens were not consistent, which reflected that environment and the growth form of thalli could affect T(leaf) signifi−cantly. Strong irradiation was expected to have adverse effects on Pn of Ochrolechia frigida and Umbilicaria antarctica whose thalli spread flat; but this photoinhibition had little effect on Usnea aurantiaco−atra with exuberant tufted thallus. These results indicated that photo−synthetic activity in lichens was affected by the growth forms of thalli besides microhabitat factors. One species of lichenized alga could exhibit diversified types of photosynthetic behavior when it was associated with various lichenized fungi in different microhabitats. It will be helpful for understanding how lichens are able to adapt to and colonize in extreme environments.

【基金/项目】 石耳目地衣的系统学研究 ; 31270118

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