极地研究

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The various substrates of Usnea aurantiaco-atra and its algal sources in the Fildes Peninsula, Antarctica

CAO Shunan1, ZHENG Hongyuan2, LIU Chuanpeng3, TIAN Huimin4, ZHOU Qiming3,5* & ZHANG Fang1*   

  1. 1 SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China;
    2 College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
    3 School of Life Science and Technology, Harbin Institute of Technology, Harbin 150001, China;
    4 Medical Faculty of Chifeng University, Chifeng 024000, China;
    5 Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
  • 出版日期:1965-12-30 发布日期:1965-12-30

The various substrates of Usnea aurantiaco-atra and its algal sources in the Fildes Peninsula, Antarctica

CAO Shunan1, ZHENG Hongyuan2, LIU Chuanpeng3, TIAN Huimin4, ZHOU Qiming3,5* & ZHANG Fang1*   

  1. 1 SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China;
    2 College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
    3 School of Life Science and Technology, Harbin Institute of Technology, Harbin 150001, China;
    4 Medical Faculty of Chifeng University, Chifeng 024000, China;
    5 Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
  • Online:1965-12-30 Published:1965-12-30

摘要: The lichen species Usnea aurantiaco-atra (Jacq.) Bory is the most dominant vegetation on the Fildes Peninsula, Antarctica. Most individuals grow on rocks, and some are found with mosses. During the 27th and 28th Chinese National Antarctic Research expeditions of the Great Wall Station, U. aurantiaco-atra was observed growing on the lichen thallus of Umbilicaria antarctica Frey & I.M. Lamb, or on wood, which indicated that Usnea aurantiaco-atra could grow on various substrates. The diversities of the symbionts in U. aurantiaco-atra collected in the Fildes Peninsula were investigated using ITS rDNA sequences. The results showed that the sequences from mycobionts of U. aurantiaco-atra growing on various substrates did not exhibit significant differences. All photobionts in this lichen species were the green algae Trebouxia jamesii (Hildreth & Ahmadjian) Gärtner. The identical sequences from the photobionts of both Umbilicaria antarctica and Usnea aurantiaco-atra indicated there was an algae pool in this area and different mycobionts could obtain their algal partners from this pool. The variety of substrates for U. aurantiaco-atra suggested its photobiont could be obtained from a mature lichen thallus by vegetative propagation; from other lichen thalli (e.g. Umbilicaria antarctica); or from the surroundings. This study will promote understanding of the distribution of photobionts and the process of lichenization.

关键词: lichen, molecular systematics, phylogeny, photobiont pool, substratum preferen

Abstract: The lichen species Usnea aurantiaco-atra (Jacq.) Bory is the most dominant vegetation on the Fildes Peninsula, Antarctica. Most individuals grow on rocks, and some are found with mosses. During the 27th and 28th Chinese National Antarctic Research expeditions of the Great Wall Station, U. aurantiaco-atra was observed growing on the lichen thallus of Umbilicaria antarctica Frey & I.M. Lamb, or on wood, which indicated that Usnea aurantiaco-atra could grow on various substrates. The diversities of the symbionts in U. aurantiaco-atra collected in the Fildes Peninsula were investigated using ITS rDNA sequences. The results showed that the sequences from mycobionts of U. aurantiaco-atra growing on various substrates did not exhibit significant differences. All photobionts in this lichen species were the green algae Trebouxia jamesii (Hildreth & Ahmadjian) Gärtner. The identical sequences from the photobionts of both Umbilicaria antarctica and Usnea aurantiaco-atra indicated there was an algae pool in this area and different mycobionts could obtain their algal partners from this pool. The variety of substrates for U. aurantiaco-atra suggested its photobiont could be obtained from a mature lichen thallus by vegetative propagation; from other lichen thalli (e.g. Umbilicaria antarctica); or from the surroundings. This study will promote understanding of the distribution of photobionts and the process of lichenization.

Key words: lichen, molecular systematics, phylogeny, photobiont pool, substratum preferen