Dissecting photosynthetic electron transport and photosystems performance in Jerusalem artichoke (Helianthus tuberosus L.) under salt stress
Yan, Kun1; Mei, Huimin2; Dong, Xiaoyan3; Zhou, Shiwei1; Cui, Jinxin1; Sun, Yanhong4
Keywordchlorophyll fluorescence delayed chlorophyll fluorescence malondialdehyde modulated 820 nm reflection photoinhibition
Corresponding AuthorYan, Kun(kyan@ldu.edu.cn)
AbstractJerusalem artichoke (Helianthus tuberosus L.), a vegetable with medical applications, has a strong adaptability to marginal barren land, but the suitability as planting material in saline land remains to be evaluated. This study was envisaged to examine salt tolerance in Jerusalem artichoke from the angle of photosynthetic apparatus stability by dissecting the photosynthetic electron transport process. Potted plants were exposed to salt stress by watering with a nutrient solution supplemented with NaCl. Photosystem I (PSI) and photosystem II (PSII) photoinhibition appeared under salt stress, according to the significant decrease in the maximal photochemical efficiency of PSI (oMR/MR0) and PSII. Consistently, leaf hydrogen peroxide (H2O2) concentration and lipid peroxidation were remarkably elevated after 8 days of salt stress, confirming salt-induced oxidative stress. Besides photoinhibition of the PSII reaction center, the PSII donor side was also impaired under salt stress, as a K step emerged in the prompt chlorophyll transient, but the PSII acceptor side was more vulnerable, considering the decreased probability of an electron movement beyond the primary quinone (ETo/TRo) upon depressed upstream electron donation. The declined performance of entire PSII components inhibited electron inflow to PSI, but severe PSI photoinhibition was not averted. Notably, PSI photoinhibition elevated the excitation pressure of PSII (1-qP) by inhibiting the PSII acceptor side due to the negative and positive correlation of oMR/MR0 with 1-qP and ETo/TRo, respectively. Furthermore, excessive reduction of PSII acceptors side due to PSI photoinhibition was simulated by applying a specific inhibitor blocking electron transport beyond primary quinone, demonstrating that PSII photoinhibition was actually accelerated by PSI photoinhibition under salt stress. In conclusion, PSII and PSI vulnerabilities were proven in Jerusalem artichoke under salt stress, and PSII inactivation, which was a passive consequence of PSI photoinhibition, hardly helped protect PSI. As a salt-sensitive species, Jerusalem artichoke was recommended to be planted in non-saline marginal land or mild saline land with soil desalination measures.
Funding OrganizationNational Key Research and Development Project in China ; National Natural Science Foundation of China ; Yantai Science and Technology Innovation Development Plan
Indexed BySCI
WOS Research AreaPlant Sciences
WOS IDWOS:000838890800001
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYan, Kun
Affiliation1.Ludong Univ, Sch Agr, Yantai, Peoples R China
2.Liaoning Univ, Sch Life Sci, Shenyang, Peoples R China
3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai, Peoples R China
4.Yantai Univ, Sch Environm & Mat Engn, Yantai, Peoples R China
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GB/T 7714
Yan, Kun,Mei, Huimin,Dong, Xiaoyan,et al. Dissecting photosynthetic electron transport and photosystems performance in Jerusalem artichoke (Helianthus tuberosus L.) under salt stress[J]. FRONTIERS IN PLANT SCIENCE,2022,13:10.
APA Yan, Kun,Mei, Huimin,Dong, Xiaoyan,Zhou, Shiwei,Cui, Jinxin,&Sun, Yanhong.(2022).Dissecting photosynthetic electron transport and photosystems performance in Jerusalem artichoke (Helianthus tuberosus L.) under salt stress.FRONTIERS IN PLANT SCIENCE,13,10.
MLA Yan, Kun,et al."Dissecting photosynthetic electron transport and photosystems performance in Jerusalem artichoke (Helianthus tuberosus L.) under salt stress".FRONTIERS IN PLANT SCIENCE 13(2022):10.
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