Responses of photosystem I compared with photosystem II to combination of heat stress and fluctuating light in tobacco leaves
•Photosynthetic responses to heat and fluctuating light were investigated in tobacco.•Heat induces the stimulation of CEF in high light phases under fluctuating light.•The stimulation of CEF facilitates the electron sink via photorespiration.•Photoinhibition under fluctuating light was unaffected by...
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Veröffentlicht in: | Plant science (Limerick) 2020-03, Vol.292, p.110371-110371, Article 110371 |
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description | •Photosynthetic responses to heat and fluctuating light were investigated in tobacco.•Heat induces the stimulation of CEF in high light phases under fluctuating light.•The stimulation of CEF facilitates the electron sink via photorespiration.•Photoinhibition under fluctuating light was unaffected by moderate heat stress.•Coordination of CEF and photorespiration favors photoprotection under heat stress.
Moderate heat stress is usually accompanied with fluctuating light in summer. Although either heat stress or fluctuating light can cause photoinhibition of photosystems I and II (PSI and PSII), it is unclear whether moderate heat stress accelerate photoinhibition under fluctuating light. Here, we measured chlorophyll fluorescence, P700 redox state and the electrochromic shift signal under fluctuating light at 25 °C and 42 °C for tobacco leaves. We found that (1) the thylakoid proton conductance was significantly enhanced at 42 °C, leading to a decline in trans-thylakoid proton gradient (ΔpH); (2) this low ΔpH at 42 °C did not decrease donor-side limitation of PSI and thermal energy dissipation in PSII; (3) the activation of cyclic electron flow (CEF) around PSI was elevated at 42 °C; and (4) the moderate heat stress did not accelerate photoinhibition of PSI and PSII under fluctuating light. These results strongly indicate that under moderate heat stress the stimulation of CEF protects PSI under fluctuating light in tobacco leaves. |
doi_str_mv | 10.1016/j.plantsci.2019.110371 |
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Moderate heat stress is usually accompanied with fluctuating light in summer. Although either heat stress or fluctuating light can cause photoinhibition of photosystems I and II (PSI and PSII), it is unclear whether moderate heat stress accelerate photoinhibition under fluctuating light. Here, we measured chlorophyll fluorescence, P700 redox state and the electrochromic shift signal under fluctuating light at 25 °C and 42 °C for tobacco leaves. We found that (1) the thylakoid proton conductance was significantly enhanced at 42 °C, leading to a decline in trans-thylakoid proton gradient (ΔpH); (2) this low ΔpH at 42 °C did not decrease donor-side limitation of PSI and thermal energy dissipation in PSII; (3) the activation of cyclic electron flow (CEF) around PSI was elevated at 42 °C; and (4) the moderate heat stress did not accelerate photoinhibition of PSI and PSII under fluctuating light. These results strongly indicate that under moderate heat stress the stimulation of CEF protects PSI under fluctuating light in tobacco leaves.</description><identifier>ISSN: 0168-9452</identifier><identifier>EISSN: 1873-2259</identifier><identifier>DOI: 10.1016/j.plantsci.2019.110371</identifier><identifier>PMID: 32005377</identifier><language>eng</language><publisher>Ireland: Elsevier B.V</publisher><subject>Cyclic electron flow ; Heat-Shock Response ; Light ; Moderate heat stress ; Nicotiana - metabolism ; Nicotiana - radiation effects ; Photoinhibition ; Photoprotection ; Photorespiration ; Photosystem I ; Photosystem I Protein Complex - metabolism ; Photosystem II Protein Complex - metabolism ; Plant Leaves - metabolism ; Plant Leaves - radiation effects</subject><ispartof>Plant science (Limerick), 2020-03, Vol.292, p.110371-110371, Article 110371</ispartof><rights>2019 Elsevier B.V.</rights><rights>Copyright © 2019 Elsevier B.V. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c368t-ea45a60ff4a8d02090825cfd9aff2636a101b1e1edb71ff48eb6dc7b819fa8973</citedby><cites>FETCH-LOGICAL-c368t-ea45a60ff4a8d02090825cfd9aff2636a101b1e1edb71ff48eb6dc7b819fa8973</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.plantsci.2019.110371$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/32005377$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Tan, Shun-Ling</creatorcontrib><creatorcontrib>Yang, Ying-Jie</creatorcontrib><creatorcontrib>Liu, Tao</creatorcontrib><creatorcontrib>Zhang, Shi-Bao</creatorcontrib><creatorcontrib>Huang, Wei</creatorcontrib><title>Responses of photosystem I compared with photosystem II to combination of heat stress and fluctuating light in tobacco leaves</title><title>Plant science (Limerick)</title><addtitle>Plant Sci</addtitle><description>•Photosynthetic responses to heat and fluctuating light were investigated in tobacco.•Heat induces the stimulation of CEF in high light phases under fluctuating light.•The stimulation of CEF facilitates the electron sink via photorespiration.•Photoinhibition under fluctuating light was unaffected by moderate heat stress.•Coordination of CEF and photorespiration favors photoprotection under heat stress.
Moderate heat stress is usually accompanied with fluctuating light in summer. Although either heat stress or fluctuating light can cause photoinhibition of photosystems I and II (PSI and PSII), it is unclear whether moderate heat stress accelerate photoinhibition under fluctuating light. Here, we measured chlorophyll fluorescence, P700 redox state and the electrochromic shift signal under fluctuating light at 25 °C and 42 °C for tobacco leaves. We found that (1) the thylakoid proton conductance was significantly enhanced at 42 °C, leading to a decline in trans-thylakoid proton gradient (ΔpH); (2) this low ΔpH at 42 °C did not decrease donor-side limitation of PSI and thermal energy dissipation in PSII; (3) the activation of cyclic electron flow (CEF) around PSI was elevated at 42 °C; and (4) the moderate heat stress did not accelerate photoinhibition of PSI and PSII under fluctuating light. These results strongly indicate that under moderate heat stress the stimulation of CEF protects PSI under fluctuating light in tobacco leaves.</description><subject>Cyclic electron flow</subject><subject>Heat-Shock Response</subject><subject>Light</subject><subject>Moderate heat stress</subject><subject>Nicotiana - metabolism</subject><subject>Nicotiana - radiation effects</subject><subject>Photoinhibition</subject><subject>Photoprotection</subject><subject>Photorespiration</subject><subject>Photosystem I</subject><subject>Photosystem I Protein Complex - metabolism</subject><subject>Photosystem II Protein Complex - metabolism</subject><subject>Plant Leaves - metabolism</subject><subject>Plant Leaves - radiation effects</subject><issn>0168-9452</issn><issn>1873-2259</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkD1v2zAQhomiQe18_IWAYxc5JGVJ1NbCaBMDBgoEyUxQ5DGmIYkqj3KRof-9NJwU6NTphvd573APIbecrTjj9d1hNfV6TGj8SjDerjhnZcM_kCWXTVkIUbUfyTKDsmjXlViQS8QDY0xUVfOJLErBWFU2zZL8fgScwoiANDg67UMK-IoJBrqlJgyTjmDpL5_2_2ZbmsIp7_yokw_jqbwHnSimCIhUj5a6fjZpzvH4Qnv_sk_Uj7nWaWMC7UEfAa_JhdM9ws3bvCLP3789bR6K3Y_77ebrrjBlLVMBel3pmjm31tIywVomRWWcbbVzoi5rnZV0HDjYruGZktDV1jSd5K3Tsm3KK_L5vHeK4ecMmNTg0UCfFUKYUYmyYqxdSy4yWp9REwNiBKem6AcdXxVn6qReHdS7enVSr87qc_H27cbcDWD_1t5dZ-DLGYD86dFDVHkFjAasj2CSssH_78YfF5ObgQ</recordid><startdate>202003</startdate><enddate>202003</enddate><creator>Tan, Shun-Ling</creator><creator>Yang, Ying-Jie</creator><creator>Liu, Tao</creator><creator>Zhang, Shi-Bao</creator><creator>Huang, Wei</creator><general>Elsevier B.V</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>202003</creationdate><title>Responses of photosystem I compared with photosystem II to combination of heat stress and fluctuating light in tobacco leaves</title><author>Tan, Shun-Ling ; Yang, Ying-Jie ; Liu, Tao ; Zhang, Shi-Bao ; Huang, Wei</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c368t-ea45a60ff4a8d02090825cfd9aff2636a101b1e1edb71ff48eb6dc7b819fa8973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Cyclic electron flow</topic><topic>Heat-Shock Response</topic><topic>Light</topic><topic>Moderate heat stress</topic><topic>Nicotiana - metabolism</topic><topic>Nicotiana - radiation effects</topic><topic>Photoinhibition</topic><topic>Photoprotection</topic><topic>Photorespiration</topic><topic>Photosystem I</topic><topic>Photosystem I Protein Complex - metabolism</topic><topic>Photosystem II Protein Complex - metabolism</topic><topic>Plant Leaves - metabolism</topic><topic>Plant Leaves - radiation effects</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tan, Shun-Ling</creatorcontrib><creatorcontrib>Yang, Ying-Jie</creatorcontrib><creatorcontrib>Liu, Tao</creatorcontrib><creatorcontrib>Zhang, Shi-Bao</creatorcontrib><creatorcontrib>Huang, Wei</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Plant science (Limerick)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tan, Shun-Ling</au><au>Yang, Ying-Jie</au><au>Liu, Tao</au><au>Zhang, Shi-Bao</au><au>Huang, Wei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Responses of photosystem I compared with photosystem II to combination of heat stress and fluctuating light in tobacco leaves</atitle><jtitle>Plant science (Limerick)</jtitle><addtitle>Plant Sci</addtitle><date>2020-03</date><risdate>2020</risdate><volume>292</volume><spage>110371</spage><epage>110371</epage><pages>110371-110371</pages><artnum>110371</artnum><issn>0168-9452</issn><eissn>1873-2259</eissn><abstract>•Photosynthetic responses to heat and fluctuating light were investigated in tobacco.•Heat induces the stimulation of CEF in high light phases under fluctuating light.•The stimulation of CEF facilitates the electron sink via photorespiration.•Photoinhibition under fluctuating light was unaffected by moderate heat stress.•Coordination of CEF and photorespiration favors photoprotection under heat stress.
Moderate heat stress is usually accompanied with fluctuating light in summer. Although either heat stress or fluctuating light can cause photoinhibition of photosystems I and II (PSI and PSII), it is unclear whether moderate heat stress accelerate photoinhibition under fluctuating light. Here, we measured chlorophyll fluorescence, P700 redox state and the electrochromic shift signal under fluctuating light at 25 °C and 42 °C for tobacco leaves. We found that (1) the thylakoid proton conductance was significantly enhanced at 42 °C, leading to a decline in trans-thylakoid proton gradient (ΔpH); (2) this low ΔpH at 42 °C did not decrease donor-side limitation of PSI and thermal energy dissipation in PSII; (3) the activation of cyclic electron flow (CEF) around PSI was elevated at 42 °C; and (4) the moderate heat stress did not accelerate photoinhibition of PSI and PSII under fluctuating light. These results strongly indicate that under moderate heat stress the stimulation of CEF protects PSI under fluctuating light in tobacco leaves.</abstract><cop>Ireland</cop><pub>Elsevier B.V</pub><pmid>32005377</pmid><doi>10.1016/j.plantsci.2019.110371</doi><tpages>1</tpages></addata></record> |
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subjects | Cyclic electron flow Heat-Shock Response Light Moderate heat stress Nicotiana - metabolism Nicotiana - radiation effects Photoinhibition Photoprotection Photorespiration Photosystem I Photosystem I Protein Complex - metabolism Photosystem II Protein Complex - metabolism Plant Leaves - metabolism Plant Leaves - radiation effects |
title | Responses of photosystem I compared with photosystem II to combination of heat stress and fluctuating light in tobacco leaves |
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