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Differential selection of photobionts and ecophysiological acclimation by the bipolar lichen Cetraria aculeata

双极地衣 Cetraria aculeata 光生物素的差异选择和生态生理适应

基本信息

批准号：
128368210
负责人：
Dr. Christian Printzen
金额：
--
依托单位：
Abteilung Botanik und Molekulare Evolutionsforschung
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/128368210?language=en
关键词：
Differential selection photobionts ecophysiological acclimation

项目摘要

Lichens are highly specialized symbioses between heterotrophic fungi and autotrophic green algae or cyanobacteria. Polar and alpine habitats are mostly dominated by lichens, which successfully outcompete vascular plants and bryophytes in terms of biodiversity and often also biomass. Previous results by the applicant show that (sub)antarctic and arctic populations of Cetraria aculeata select different strains of the green algal photobiont Trebouxia jamesii s. lat. than temperate populations. However, it is so far unknown, whether this is just a phlogeographic pattern or whether genetic differences between the photobionts are associated with differences in physiological traits (ecotypic differentiation). In this project, we propose (1) to genotype mycobionts and photobionts from six antarctic, arctic and temperate populations, (2) to measure photosynthetic parameters for these genotyped lichens and their isolated photobionts, and (3) to transplant temperate individuals to arctic populations and vice versa in a common garden design to measure changes in dry weight over three years. The ultimate goal is to investigate whether differential association with ecotypically differentiated photobionts allows widely distributed lichen fungi to inhabit climatically hostile polar regions. The results of our study will strongly influence our ability to predict the impact of global climate change on polar terrestrial ecosystems.

地衣是异养真菌和自养绿色藻类或蓝藻之间高度特化的共生体。极地和高山生境主要是地衣，它们在生物多样性和生物量方面成功地胜过了维管植物和苔藓植物。申请人先前的结果表明，刺斑藻的（亚）南极和北极种群选择不同的绿色藻类光生生物Trebouxia jamesii s菌株。lat.比温带地区的人口。然而，目前还不清楚，这是否只是一个phlogeographic模式或是否之间的遗传差异的光合生物与生理性状的差异（生态型分化）。在这个项目中，我们建议（1）基因分型的真菌和光合生物从六个南极，北极和温带人口，（2）测量光合参数为这些基因型地衣和孤立的光合生物，和（3）移植温带个人到北极人口，反之亦然，在一个共同的花园设计，以测量干重的变化超过三年。最终的目标是调查是否与生态分化的光合生物的差异协会允许广泛分布的地衣真菌栖息在气候恶劣的极地地区。我们的研究结果将极大地影响我们预测全球气候变化对极地陆地生态系统影响的能力。