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

作　　者：CAO Shunan ZHENG Hongyuan LIU Chuanpeng TIAN Huimin ZHOU Qiming ZHANG Fang 

机构地区：[1]SOA Key Laboratory for Polar Science, Polar Research Institute of China [2]College of Environmental Science and Engineering, Tongji University [3]School of Life Science and Technology, Harbin Institute of Technology [4]Medical Faculty of Chifeng University [5]Institute of Microbiology, Chinese Academy of Sciences

出　　处：《Advances in Polar Science》2015年第4期274-281,共8页极地科学进展（英文版）

基　　金：supported by State Oceanic Administration, P. R. China (Grant nos. 10/11 GW06, 2011GW12016);the National Natural Science Foundation of China (Grant nos. 31000010, 31270118, 41206189)

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） Gartner. 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.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） Gartner. 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 preference 

分 类 号：Q949[生物学—植物学]