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Photosynthetic characteristics of aerial microalga Trentepohlia jolithus during drying and rewetting cycles
Zhang, Litao1,2; Li, Yongfu1; Liu, Jianguo1,2
2020-09-01
Source PublicationALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
ISSN2211-9264
Volume50Pages:7
AbstractAerial microalga Trentepohlia jolithus is frequently exposed to drying and rewetting cycles. To characterize the adaptive mechanisms allowing survivability of this aerial microalga, the responses of photosynthetic characteristics and photoprotective mechanisms to moderate desiccation (80% and 60% relative air humidity) and severe desiccation (40% relative air humidity) were investigated in T. jolithus grown at 95% relative air humidity. Additionally, the recovery of photosynthetic performance in severe desiccated T. jolithus was monitored after rehydration. In T. jolithus, non-photochemical quenching (NPQ) decreased gradually as the relative air humidity decreased from 95% to 40%, but the actual photochemical efficiency of photosystem II (Phi(PSII)) remained unchanged until the relative air humidity decreased to 40% under high light, indicating that the photoprotective mechanism NPQ was more sensitive to desiccation than photosynthetic linear electron flow. NPQ was maximally induced even under low light during moderate and severe desiccation. Under high light, excess excitation energy would not be well dissipated by NPQ in the desiccated state. However, a fraction of reaction centers were reversibly down-regulated during moderate and severe desiccation under high light. Inactive reaction centers well protected desiccated T. jolithus against photoinhibition by dissipating excess excitation energy as heat. The linear electron flow was inhibited significantly under severe desiccation. However, activated key Calvin cycle enzymes in severe desiccated T. jolithus promoted the surprisingly rapid recovery of linear electron flow after rehydration. The rapid reaction center recovery of severe desiccated T. jolithus might also favor the fast recovery of linear electron flow after rehydration. Therefore, the reversible down-regulation of reaction centers during desiccation, the maintenance of linear electron flow during moderate desiccation, and the rapid recovery of linear electron flow of severe desiccated algal cells after rehydration might be special adaptive mechanisms that allow T. jolithus to survive in an environment with rapidly changing water availability.
KeywordAerial microalgae Desiccation Photodamage Rehydration Tolerance
DOI10.1016/j.algal.2020.101992
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[31300330] ; Blue Life program of Qingdao National Laboratory for Marine Science and Technology[MS2019NO01] ; Shandong Provincial Natural Science Foundation, China[ZR2019BC057]
WOS Research AreaBiotechnology & Applied Microbiology
WOS SubjectBiotechnology & Applied Microbiology
WOS IDWOS:000558683500020
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/168166
Collection实验海洋生物学重点实验室
Corresponding AuthorLiu, Jianguo
Affiliation1.Chinese Acad Sci, Ctr Ocean Megasci, Inst Oceanol, Key Lab Expt Marine Biol, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Biol & Biotechnol, Qingdao 266071, Peoples R China
First Author AffilicationCenter for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationCenter for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang, Litao,Li, Yongfu,Liu, Jianguo. Photosynthetic characteristics of aerial microalga Trentepohlia jolithus during drying and rewetting cycles[J]. ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS,2020,50:7.
APA Zhang, Litao,Li, Yongfu,&Liu, Jianguo.(2020).Photosynthetic characteristics of aerial microalga Trentepohlia jolithus during drying and rewetting cycles.ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS,50,7.
MLA Zhang, Litao,et al."Photosynthetic characteristics of aerial microalga Trentepohlia jolithus during drying and rewetting cycles".ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS 50(2020):7.
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