Photosynthetic characteristics of aerial microalga Trentepohlia jolithus during drying and rewetting cycles

doi:10.1016/j.algal.2020.101992

IOCAS-IR > 实验海洋生物学重点实验室

	Photosynthetic characteristics of aerial microalga Trentepohlia jolithus during drying and rewetting cycles
	Zhang, Litao 1,2; Li, Yongfu 1; Liu, Jianguo 1,2
	2020-09-01
发表期刊	ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
ISSN	2211-9264
卷号	50 页码:7
摘要	Aerial 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.
关键词	Aerial microalgae Desiccation Photodamage Rehydration Tolerance
DOI	10.1016/j.algal.2020.101992
收录类别	SCI
语种	英语
资助项目	National 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研究方向	Biotechnology & Applied Microbiology
WOS类目	Biotechnology & Applied Microbiology
WOS记录号	WOS:000558683500020
出版者	ELSEVIER
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.qdio.ac.cn/handle/337002/168166
专题	实验海洋生物学重点实验室
通讯作者	Liu, Jianguo
作者单位	1.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
第一作者单位	中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋大科学研究中心
推荐引用方式 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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