The Antarctic sea ice alga Chlamydomonas sp. ICE-L provides insights into adaptive patterns of chloroplast evolution
| العنوان: | The Antarctic sea ice alga Chlamydomonas sp. ICE-L provides insights into adaptive patterns of chloroplast evolution |
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| المؤلفون: | Jinlai Miao, Zhenhua Zhang, Bojian Zhong, Chang Liu, Zhiqiang Gu, Meiling An |
| المصدر: | BMC Plant Biology, Vol 18, Iss 1, Pp 1-12 (2018) BMC Plant Biology |
| بيانات النشر: | BMC, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | 0106 biological sciences, 0301 basic medicine, Chloroplasts, Antarctic Regions, Plant Science, Antarctic sea ice, 01 natural sciences, 03 medical and health sciences, Molecular evolution, lcsh:Botany, Botany, Extreme environment, Photosynthesis, Antarctic ice algae, biology, Phototroph, Chlamydomonas, biology.organism_classification, lcsh:QK1-989, Chloroplast, Positive selection, 030104 developmental biology, Green algae, human activities, Ice alga, Convergent evolution, Research Article, 010606 plant biology & botany |
| الوصف: | Background The ice alga Chlamydomonas sp. ICE-L is the main contributor to primary productivity in Antarctic sea ice ecosystems and is well adapted to the extremely harsh environment. However, the adaptive mechanism of Chlamydomonas sp. ICE-L to sea-ice environment remains unclear. To study the adaptive strategies in Chlamydomonas sp. ICE-L, we investigated the molecular evolution of chloroplast photosynthetic genes that are essential for the accumulation of carbohydrate and energy living in Antarctic sea ice. Results The 60 chloroplast protein-coding genes of Chlamydomonas sp. ICE-L were obtained, and the branch-site test detected significant signatures of positive selection on atpB, psaB, and rbcL genes in Chlamydomonas sp. ICE-L associated with the photosynthetic machinery. These positively selected genes were further identified as being under convergent evolution between Chlamydomonas sp. ICE-L and the halotolerant alga Dunaliella salina. Conclusions Our study provides evidence that the phototrophic component of Chlamydomonas sp. ICE-L exhibits adaptive evolution under extreme environment. The positive Darwinian selection operates on the chloroplast protein-coding genes of Antarctic ice algae adapted to extreme environment following functional-specific and lineages-specific patterns. In addition, three positively selected genes with convergent substitutions in Chlamydomonas sp. ICE-L were identified, and the adaptive modifications in these genes were in functionally important regions of the proteins. Our study provides a foundation for future experiments on the biochemical and physiological impacts of photosynthetic genes in green algae. Electronic supplementary material The online version of this article (10.1186/s12870-018-1273-x) contains supplementary material, which is available to authorized users. |
| اللغة: | English |
| تدمد: | 1471-2229 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9efed1dc44de576a7049ef0fd522da2 http://link.springer.com/article/10.1186/s12870-018-1273-x |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....e9efed1dc44de576a7049ef0fd522da2 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14712229 |
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