| 来源类型 | Article |
| 规范类型 | 其他 |
| DOI | 10.1002/ece3.3257 |
| Symbiosis constraints: Strong mycobiont control limits nutrient response in lichens. | |
| Palmqvist K; Franklin O; Näsholm T | |
| 发表日期 | 2017 |
| 出处 | Ecology and Evolution 7 (18): 7420-7433 |
| 出版年 | 2017 |
| 语种 | 英语 |
| 摘要 | Symbioses such as lichens are potentially threatened by drastic environmental changes. We used the lichen Peltigera aphthosa—a symbiosis between a fungus (mycobiont), a green alga (Coccomyxa sp.), and N2-fixing cyanobacteria (Nostoc sp.)—as a model organism to assess the effects of environmental perturbations in nitrogen (N) or phosphorus (P). Growth, carbon (C) and N stable isotopes, CNP concentrations, and specific markers were analyzed in whole thalli and the partners after 4 months of daily nutrient additions in the field. Thallus N was 40% higher in N-fertilized thalli, amino acid concentrations were twice as high, while fungal chitin but not ergosterol was lower. Nitrogen also resulted in a thicker algal layer and density, and a higher δ13C abundance in all three partners. Photosynthesis was not affected by either N or P. Thallus growth increased with light dose independent of fertilization regime. We conclude that faster algal growth compared to fungal lead to increased competition for light and CO2 among the Coccomyxa cells, and for C between alga and fungus, resulting in neither photosynthesis nor thallus growth responded to N fertilization. This suggests that the symbiotic lifestyle of lichens may prevent them from utilizing nutrient abundance to increase C assimilation and growth. |
| 主题 | Ecosystems Services and Management (ESM) |
| URL | http://pure.iiasa.ac.at/id/eprint/14772/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/130884 |
| 推荐引用方式 GB/T 7714 | Palmqvist K,Franklin O,Näsholm T. Symbiosis constraints: Strong mycobiont control limits nutrient response in lichens.. 2017. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| ece33257.pdf（1195KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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