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

doi:10.1016/j.algal.2020.101992

CORC > 海洋研究所 > 中国科学院海洋研究所 > 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
刊名	ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
	2020-09-01
卷号	50 页码:7
关键词	Aerial microalgae Desiccation Photodamage Rehydration Tolerance
ISSN号	2211-9264
DOI	10.1016/j.algal.2020.101992
英文摘要	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.
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
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000558683500020
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/168165]
专题	海洋研究所_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
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.