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Chlorella thermophila (Trebouxiophyceae, Chlorophyta), a novel thermo-tolerant Chlorella species isolated from an occupied rooftop incubator

文献类型： 外文期刊

作者： Ma, Shuai 1 ; Han, Bingyin 1 ; Huss, Volker A. R. 2 ; Hu, Xiaowen 1 ; Sun, Xuepiao 1 ; Zhang, Jiaming 1 ;

作者机构： 1.CATAS, Inst Trop Biosci & Biotechnol, Hainan Bioenergy Ctr, MOA Key Lab Biol & Genet Resources Trop Crops, Haikou 571101, Hainan, Peoples R China

2.Univ Erlangen Nurnberg, Dept Biol, D-91058 Erlangen, Germany

关键词： Chlorella vulgaris;Chlorella thermophila;Microalgae;Invading species;Rooftop incubator;Phylogenetic analysis

期刊名称：HYDROBIOLOGIA （ 影响因子：2.694； 五年影响因子：2.781 ）

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收录情况： SCI

摘要： Open rooftop incubators may provide a cost-effective way for producing microalgal biomass for biodiesel production without requiring large land areas. While cultivating a Chlorella vulgaris strain with high oil content in a rooftop incubator, we identified an invading thermo-resistant green alga, which replaced the original culture. The isolated strain HTA1-65 had the typical Chlorella morphology with spherical cells and a cup-shaped parietal chloroplast. The protoplast contained a single pyrenoid traversed by a double-layered thylakoid and enveloped by a single starch sheath. The oil content of this strain was only 21.5 %, one third of the original strain. This strain grew at 42 A degrees C, with an optimum of 33 A degrees C. Heat treatment of 45 A degrees C for 3 h per day did not decrease its growth rate, suggesting that it has a high potential in biotechnological applications. Phylogenetic analyses revealed that HTA1-65 belongs to the genus Chlorella, but a specific relationship to any species was not indicated by nuclear and chloroplast small subunit rRNA genes. However, based on at least one compensating base change (CBC) and a few hemi-CBCs in the ITS2 secondary structure of closely related species, we describe strain HTA1-65 as a novel, thermo-tolerant Chlorella species, C. thermophila.

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