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Rapid, blue-light-induced acidifications at the surface of Ectocarpus and other marine macroalgae
In most brown algae, photosynthesis saturated with red light can be stimulated by continuous blue light. Pulses of blue light lead to transient increases in photosynthetic rate. When a CO2-sensitive electrode was used, occasionally blue light was observed to cause an apparent increase of CO2 instead...
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Published in: | Plant physiology (Bethesda) 1993-03, Vol.101 (3), p.907-913 |
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description | In most brown algae, photosynthesis saturated with red light can be stimulated by continuous blue light. Pulses of blue light lead to transient increases in photosynthetic rate. When a CO2-sensitive electrode was used, occasionally blue light was observed to cause an apparent increase of CO2 instead of the expected decrease. This was changed by buffering the seawater medium and, under these conditions, blue light caused stimulation of CO2 consumption. These results led to investigations of blue-light-dependent pH changes at the outer surface of the plants. Shifts of the pH were recorded in the presence of the photosynthetic inhibitor 3-(3,4- dichlorophenyl)-1,1-dimethylurea. In all brown algae tested and in the green algae Ulva and Enteromorpha, blue-light pulses caused transient acidification of 0.03 to 0.18 pH units, depending on the species. The kinetics showed lag phases of a few seconds and the minimum was reached after 5 to 9 min. Fluence response relationships indicated that the sensitivity threshold) to blue light was very similar in all species. The responses in Ectocarpus changed with time, and about 5 h after the beginning of red light or darkness, a second component became evident, which peaked 20 min after the blue-light pulse. The refractory period of the whole system was about 3 h in Ectocarpus. The blue-light-dependent pH changes show striking similarities to those of higher plant guard cells, and it is possible that similar responses may occur in other tissues of higher plants. In red algae, however, no blue-light-dependent acidifications could be detected. The possible role of the observed pH shifts in a mechanism of CO2 acquisition is discussed |
doi_str_mv | 10.1104/pp.101.3.907 |
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Pulses of blue light lead to transient increases in photosynthetic rate. When a CO2-sensitive electrode was used, occasionally blue light was observed to cause an apparent increase of CO2 instead of the expected decrease. This was changed by buffering the seawater medium and, under these conditions, blue light caused stimulation of CO2 consumption. These results led to investigations of blue-light-dependent pH changes at the outer surface of the plants. Shifts of the pH were recorded in the presence of the photosynthetic inhibitor 3-(3,4- dichlorophenyl)-1,1-dimethylurea. In all brown algae tested and in the green algae Ulva and Enteromorpha, blue-light pulses caused transient acidification of 0.03 to 0.18 pH units, depending on the species. The kinetics showed lag phases of a few seconds and the minimum was reached after 5 to 9 min. Fluence response relationships indicated that the sensitivity threshold) to blue light was very similar in all species. The responses in Ectocarpus changed with time, and about 5 h after the beginning of red light or darkness, a second component became evident, which peaked 20 min after the blue-light pulse. The refractory period of the whole system was about 3 h in Ectocarpus. The blue-light-dependent pH changes show striking similarities to those of higher plant guard cells, and it is possible that similar responses may occur in other tissues of higher plants. In red algae, however, no blue-light-dependent acidifications could be detected. The possible role of the observed pH shifts in a mechanism of CO2 acquisition is discussed</description><identifier>ISSN: 0032-0889</identifier><identifier>EISSN: 1532-2548</identifier><identifier>DOI: 10.1104/pp.101.3.907</identifier><identifier>PMID: 12231742</identifier><language>eng</language><publisher>United States: American Society of Plant Physiologists</publisher><subject>ACIDIFICACION ; ACIDIFICATION ; Brown algae ; Carbon dioxide ; CHLOROPHYCEAE ; DIURON ; Ectocarpus ; Electrodes ; Enteromorpha ; Environmental and Stress Physiology ; Evolution ; Irradiation ; LUMIERE ; LUZ ; Marine ; PHAEOPHYCEAE ; Phaeophyta ; Photosynthesis ; Plants ; Sea water ; Ulva</subject><ispartof>Plant physiology (Bethesda), 1993-03, Vol.101 (3), p.907-913</ispartof><rights>Copyright 1993 American Society of Plant Physiologists</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c488t-22532b89e2b6b93d21ad922c147c919757aacb225bd04cfc6962355e1be18c0b3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/4275051$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/4275051$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>230,314,780,784,885,27924,27925,58238,58471</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12231742$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Schmid, R</creatorcontrib><creatorcontrib>Dring, M.J</creatorcontrib><title>Rapid, blue-light-induced acidifications at the surface of Ectocarpus and other marine macroalgae</title><title>Plant physiology (Bethesda)</title><addtitle>Plant Physiol</addtitle><description>In most brown algae, photosynthesis saturated with red light can be stimulated by continuous blue light. Pulses of blue light lead to transient increases in photosynthetic rate. When a CO2-sensitive electrode was used, occasionally blue light was observed to cause an apparent increase of CO2 instead of the expected decrease. This was changed by buffering the seawater medium and, under these conditions, blue light caused stimulation of CO2 consumption. These results led to investigations of blue-light-dependent pH changes at the outer surface of the plants. Shifts of the pH were recorded in the presence of the photosynthetic inhibitor 3-(3,4- dichlorophenyl)-1,1-dimethylurea. In all brown algae tested and in the green algae Ulva and Enteromorpha, blue-light pulses caused transient acidification of 0.03 to 0.18 pH units, depending on the species. The kinetics showed lag phases of a few seconds and the minimum was reached after 5 to 9 min. Fluence response relationships indicated that the sensitivity threshold) to blue light was very similar in all species. The responses in Ectocarpus changed with time, and about 5 h after the beginning of red light or darkness, a second component became evident, which peaked 20 min after the blue-light pulse. The refractory period of the whole system was about 3 h in Ectocarpus. The blue-light-dependent pH changes show striking similarities to those of higher plant guard cells, and it is possible that similar responses may occur in other tissues of higher plants. In red algae, however, no blue-light-dependent acidifications could be detected. The possible role of the observed pH shifts in a mechanism of CO2 acquisition is discussed</description><subject>ACIDIFICACION</subject><subject>ACIDIFICATION</subject><subject>Brown algae</subject><subject>Carbon dioxide</subject><subject>CHLOROPHYCEAE</subject><subject>DIURON</subject><subject>Ectocarpus</subject><subject>Electrodes</subject><subject>Enteromorpha</subject><subject>Environmental and Stress Physiology</subject><subject>Evolution</subject><subject>Irradiation</subject><subject>LUMIERE</subject><subject>LUZ</subject><subject>Marine</subject><subject>PHAEOPHYCEAE</subject><subject>Phaeophyta</subject><subject>Photosynthesis</subject><subject>Plants</subject><subject>Sea water</subject><subject>Ulva</subject><issn>0032-0889</issn><issn>1532-2548</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1993</creationdate><recordtype>article</recordtype><recordid>eNp9kU2LFDEQhoMo7rh68yQifRIP22Mq6XQnhz3Isn7AgqDuOVQ-eiZLT6dN0oL_3sgMq148VcHzVKjKS8hzoFsA2r1dli1Q2PKtosMDsgHBWctEJx-SDaW1p1KqM_Ik5ztKKXDoHpMzYIzD0LENwS-4BHfRmGn17RR2-9KG2a3WuwZtcGEMFkuIc26wNGXvm7ymEa1v4thc2xItpmWtcHZNrDg1B0xh9rXYFHHaoX9KHo04Zf_sVM_J7fvrb1cf25vPHz5dvbtpbSdlaRmrixupPDO9UdwxQKcYs9ANVoEaxIBoTbWMo50dba96xoXwYDxISw0_J5fHd5fVHLyzfi4JJ72kUFf6qSMG_S-Zw17v4g8NQg60r_NvTvMpfl99LvoQsvXThLOPa9YgheLDSX39f7XvqeiprOLFUayfkXPy4_06QPXv9PSy1BY01zW9qr_6-4Q_8imuKrw8Cne5xHTPOzYIKqDiF0c8YtS4SyHr26-qY7KXjP8C202oHg</recordid><startdate>19930301</startdate><enddate>19930301</enddate><creator>Schmid, R</creator><creator>Dring, M.J</creator><general>American Society of Plant Physiologists</general><scope>FBQ</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope><scope>M7N</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>19930301</creationdate><title>Rapid, blue-light-induced acidifications at the surface of Ectocarpus and other marine macroalgae</title><author>Schmid, R ; Dring, M.J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c488t-22532b89e2b6b93d21ad922c147c919757aacb225bd04cfc6962355e1be18c0b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1993</creationdate><topic>ACIDIFICACION</topic><topic>ACIDIFICATION</topic><topic>Brown algae</topic><topic>Carbon dioxide</topic><topic>CHLOROPHYCEAE</topic><topic>DIURON</topic><topic>Ectocarpus</topic><topic>Electrodes</topic><topic>Enteromorpha</topic><topic>Environmental and Stress Physiology</topic><topic>Evolution</topic><topic>Irradiation</topic><topic>LUMIERE</topic><topic>LUZ</topic><topic>Marine</topic><topic>PHAEOPHYCEAE</topic><topic>Phaeophyta</topic><topic>Photosynthesis</topic><topic>Plants</topic><topic>Sea water</topic><topic>Ulva</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Schmid, R</creatorcontrib><creatorcontrib>Dring, M.J</creatorcontrib><collection>AGRIS</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Plant physiology (Bethesda)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schmid, R</au><au>Dring, M.J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Rapid, blue-light-induced acidifications at the surface of Ectocarpus and other marine macroalgae</atitle><jtitle>Plant physiology (Bethesda)</jtitle><addtitle>Plant Physiol</addtitle><date>1993-03-01</date><risdate>1993</risdate><volume>101</volume><issue>3</issue><spage>907</spage><epage>913</epage><pages>907-913</pages><issn>0032-0889</issn><eissn>1532-2548</eissn><abstract>In most brown algae, photosynthesis saturated with red light can be stimulated by continuous blue light. Pulses of blue light lead to transient increases in photosynthetic rate. When a CO2-sensitive electrode was used, occasionally blue light was observed to cause an apparent increase of CO2 instead of the expected decrease. This was changed by buffering the seawater medium and, under these conditions, blue light caused stimulation of CO2 consumption. These results led to investigations of blue-light-dependent pH changes at the outer surface of the plants. Shifts of the pH were recorded in the presence of the photosynthetic inhibitor 3-(3,4- dichlorophenyl)-1,1-dimethylurea. In all brown algae tested and in the green algae Ulva and Enteromorpha, blue-light pulses caused transient acidification of 0.03 to 0.18 pH units, depending on the species. The kinetics showed lag phases of a few seconds and the minimum was reached after 5 to 9 min. Fluence response relationships indicated that the sensitivity threshold) to blue light was very similar in all species. The responses in Ectocarpus changed with time, and about 5 h after the beginning of red light or darkness, a second component became evident, which peaked 20 min after the blue-light pulse. The refractory period of the whole system was about 3 h in Ectocarpus. The blue-light-dependent pH changes show striking similarities to those of higher plant guard cells, and it is possible that similar responses may occur in other tissues of higher plants. In red algae, however, no blue-light-dependent acidifications could be detected. The possible role of the observed pH shifts in a mechanism of CO2 acquisition is discussed</abstract><cop>United States</cop><pub>American Society of Plant Physiologists</pub><pmid>12231742</pmid><doi>10.1104/pp.101.3.907</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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subjects | ACIDIFICACION ACIDIFICATION Brown algae Carbon dioxide CHLOROPHYCEAE DIURON Ectocarpus Electrodes Enteromorpha Environmental and Stress Physiology Evolution Irradiation LUMIERE LUZ Marine PHAEOPHYCEAE Phaeophyta Photosynthesis Plants Sea water Ulva |
title | Rapid, blue-light-induced acidifications at the surface of Ectocarpus and other marine macroalgae |
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