Shoot structure and photosynthetic efficiency along the light gradient in a Scots pine canopy
We examined the effects of structural and physiological acclimation on the photosynthetic efficiency of Scots pine (Pinus sylvestris L.) shoots. We estimated daily light interception (DLI) and photosynthesis (DPHOT) of a number of sample shoots situated at different positions in the canopy. Photosyn...
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Veröffentlicht in: | Tree physiology 2001-08, Vol.21 (12-13), p.805-814 |
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description | We examined the effects of structural and physiological acclimation on the photosynthetic efficiency of Scots pine (Pinus sylvestris L.) shoots. We estimated daily light interception (DLI) and photosynthesis (DPHOT) of a number of sample shoots situated at different positions in the canopy. Photosynthetic efficiency (epsilon) was defined as the ratio of DPHOT to the potential daily light interception (DLI(ref)) defined as the photosynthetically active radiation (PAR) intercepted per unit area of a sphere at the shoot location. To calculate DLI(ref), DLI and DPHOT, the radiation field surrounding a shoot in the canopy was first modeled using simulated directional distributions of incoming PAR on a clear and an overcast day, and estimates of canopy gap fraction in different directions provided by hemispherical photographs. A model of shoot geometry and measured data on shoot structure and photosynthetic parameters were used to simulate the distribution of PAR irradiance on the needle surface area of the shoot. Photosynthetic efficiency (epsilon) was separated into light-interception efficiency (epsilon(I) = DLI/DLI(ref)) and conversion efficiency (epsilon(PHOT) = DPHOT/DLI). This allowed us to quantify separately the effect of structural acclimation on the efficiency of photosynthetic light capture (epsilon(l)), and the effect of physiological acclimation on conversion efficiency (epsilon(PHOT)). The value of epsilon increased from the top to the bottom of the canopy. The increase was largely explained by structural acclimation (higher epsilon(I)) of the shade shoots. The value of epsilon(PHOT) of shade foliage was similar to that of sun foliage. Given these efficiencies, the clear-day value of DPHOT for a sun shoot transferred to shade was only half that of a shade shoot at its original position. The method presented here provides a tool for quantitatively estimating the role of acclimation in total canopy photosynthesis. |
doi_str_mv | 10.1093/treephys/21.12-13.805 |
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We estimated daily light interception (DLI) and photosynthesis (DPHOT) of a number of sample shoots situated at different positions in the canopy. Photosynthetic efficiency (epsilon) was defined as the ratio of DPHOT to the potential daily light interception (DLI(ref)) defined as the photosynthetically active radiation (PAR) intercepted per unit area of a sphere at the shoot location. To calculate DLI(ref), DLI and DPHOT, the radiation field surrounding a shoot in the canopy was first modeled using simulated directional distributions of incoming PAR on a clear and an overcast day, and estimates of canopy gap fraction in different directions provided by hemispherical photographs. A model of shoot geometry and measured data on shoot structure and photosynthetic parameters were used to simulate the distribution of PAR irradiance on the needle surface area of the shoot. Photosynthetic efficiency (epsilon) was separated into light-interception efficiency (epsilon(I) = DLI/DLI(ref)) and conversion efficiency (epsilon(PHOT) = DPHOT/DLI). This allowed us to quantify separately the effect of structural acclimation on the efficiency of photosynthetic light capture (epsilon(l)), and the effect of physiological acclimation on conversion efficiency (epsilon(PHOT)). The value of epsilon increased from the top to the bottom of the canopy. The increase was largely explained by structural acclimation (higher epsilon(I)) of the shade shoots. The value of epsilon(PHOT) of shade foliage was similar to that of sun foliage. Given these efficiencies, the clear-day value of DPHOT for a sun shoot transferred to shade was only half that of a shade shoot at its original position. The method presented here provides a tool for quantitatively estimating the role of acclimation in total canopy photosynthesis.</description><identifier>ISSN: 0829-318X</identifier><identifier>EISSN: 1758-4469</identifier><identifier>DOI: 10.1093/treephys/21.12-13.805</identifier><identifier>PMID: 11498328</identifier><language>eng</language><publisher>Canada</publisher><subject>Light ; Mathematics ; Models, Biological ; Photosynthesis - physiology ; Pinus - anatomy & histology ; Pinus - physiology ; Pinus sylvestris ; Plant Leaves - anatomy & histology ; Plant Leaves - physiology ; Plant Shoots - anatomy & histology ; Plant Shoots - physiology ; Trees - anatomy & histology ; Trees - physiology</subject><ispartof>Tree physiology, 2001-08, Vol.21 (12-13), p.805-814</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c383t-fc328875fdd9751f812b6a69f66cc3f0dd28a0314fae8cfb4fbf610140484f703</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,782,786,27931,27932</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/11498328$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Stenberg, P</creatorcontrib><creatorcontrib>Palmroth, S</creatorcontrib><creatorcontrib>Bond, B J</creatorcontrib><creatorcontrib>Sprugel, D G</creatorcontrib><creatorcontrib>Smolander, H</creatorcontrib><title>Shoot structure and photosynthetic efficiency along the light gradient in a Scots pine canopy</title><title>Tree physiology</title><addtitle>Tree Physiol</addtitle><description>We examined the effects of structural and physiological acclimation on the photosynthetic efficiency of Scots pine (Pinus sylvestris L.) shoots. We estimated daily light interception (DLI) and photosynthesis (DPHOT) of a number of sample shoots situated at different positions in the canopy. Photosynthetic efficiency (epsilon) was defined as the ratio of DPHOT to the potential daily light interception (DLI(ref)) defined as the photosynthetically active radiation (PAR) intercepted per unit area of a sphere at the shoot location. To calculate DLI(ref), DLI and DPHOT, the radiation field surrounding a shoot in the canopy was first modeled using simulated directional distributions of incoming PAR on a clear and an overcast day, and estimates of canopy gap fraction in different directions provided by hemispherical photographs. A model of shoot geometry and measured data on shoot structure and photosynthetic parameters were used to simulate the distribution of PAR irradiance on the needle surface area of the shoot. Photosynthetic efficiency (epsilon) was separated into light-interception efficiency (epsilon(I) = DLI/DLI(ref)) and conversion efficiency (epsilon(PHOT) = DPHOT/DLI). This allowed us to quantify separately the effect of structural acclimation on the efficiency of photosynthetic light capture (epsilon(l)), and the effect of physiological acclimation on conversion efficiency (epsilon(PHOT)). The value of epsilon increased from the top to the bottom of the canopy. The increase was largely explained by structural acclimation (higher epsilon(I)) of the shade shoots. The value of epsilon(PHOT) of shade foliage was similar to that of sun foliage. Given these efficiencies, the clear-day value of DPHOT for a sun shoot transferred to shade was only half that of a shade shoot at its original position. The method presented here provides a tool for quantitatively estimating the role of acclimation in total canopy photosynthesis.</description><subject>Light</subject><subject>Mathematics</subject><subject>Models, Biological</subject><subject>Photosynthesis - physiology</subject><subject>Pinus - anatomy & histology</subject><subject>Pinus - physiology</subject><subject>Pinus sylvestris</subject><subject>Plant Leaves - anatomy & histology</subject><subject>Plant Leaves - physiology</subject><subject>Plant Shoots - anatomy & histology</subject><subject>Plant Shoots - physiology</subject><subject>Trees - anatomy & histology</subject><subject>Trees - physiology</subject><issn>0829-318X</issn><issn>1758-4469</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkU1LxDAQhoMoun78BCUnb93NJGmbHGXxCxY8qOBFQpom20q3qUl66L-34opHTwMz7zvzMg9Cl0CWQCRbpWDt0ExxRWEJNAO2FCQ_QAsoc5FxXshDtCCCyoyBeDtBpzF-EAK5EPIYnQBwKRgVC_T-3HifcExhNGkMFuu-xkPjk49TnxqbWoOtc61pbW8mrDvfb_Hcx127bRLeBl3Pk4TbHmv8bHyKeGh7i43u_TCdoyOnu2gv9vUMvd7dvqwfss3T_eP6ZpMZJljKnJmziDJ3dS3LHJwAWhW6kK4ojGGO1DUVmjDgTlthXMVd5QogwAkX3JWEnaHrn71D8J-jjUnt2mhs1-ne-jGqEkiZ05L-KwQBIudSzsL8R2iCjzFYp4bQ7nSYFBD1DUD9AlAUFFAFTM0AZt_V_sBY7Wz959p_nH0BjKuFyg</recordid><startdate>20010801</startdate><enddate>20010801</enddate><creator>Stenberg, P</creator><creator>Palmroth, S</creator><creator>Bond, B J</creator><creator>Sprugel, D G</creator><creator>Smolander, H</creator><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>7SN</scope><scope>C1K</scope><scope>7X8</scope></search><sort><creationdate>20010801</creationdate><title>Shoot structure and photosynthetic efficiency along the light gradient in a Scots pine canopy</title><author>Stenberg, P ; Palmroth, S ; Bond, B J ; Sprugel, D G ; Smolander, H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c383t-fc328875fdd9751f812b6a69f66cc3f0dd28a0314fae8cfb4fbf610140484f703</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>Light</topic><topic>Mathematics</topic><topic>Models, Biological</topic><topic>Photosynthesis - physiology</topic><topic>Pinus - anatomy & histology</topic><topic>Pinus - physiology</topic><topic>Pinus sylvestris</topic><topic>Plant Leaves - anatomy & histology</topic><topic>Plant Leaves - physiology</topic><topic>Plant Shoots - anatomy & histology</topic><topic>Plant Shoots - physiology</topic><topic>Trees - anatomy & histology</topic><topic>Trees - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Stenberg, P</creatorcontrib><creatorcontrib>Palmroth, S</creatorcontrib><creatorcontrib>Bond, B J</creatorcontrib><creatorcontrib>Sprugel, D G</creatorcontrib><creatorcontrib>Smolander, H</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Ecology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>MEDLINE - Academic</collection><jtitle>Tree physiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Stenberg, P</au><au>Palmroth, S</au><au>Bond, B J</au><au>Sprugel, D G</au><au>Smolander, H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Shoot structure and photosynthetic efficiency along the light gradient in a Scots pine canopy</atitle><jtitle>Tree physiology</jtitle><addtitle>Tree Physiol</addtitle><date>2001-08-01</date><risdate>2001</risdate><volume>21</volume><issue>12-13</issue><spage>805</spage><epage>814</epage><pages>805-814</pages><issn>0829-318X</issn><eissn>1758-4469</eissn><abstract>We examined the effects of structural and physiological acclimation on the photosynthetic efficiency of Scots pine (Pinus sylvestris L.) shoots. We estimated daily light interception (DLI) and photosynthesis (DPHOT) of a number of sample shoots situated at different positions in the canopy. Photosynthetic efficiency (epsilon) was defined as the ratio of DPHOT to the potential daily light interception (DLI(ref)) defined as the photosynthetically active radiation (PAR) intercepted per unit area of a sphere at the shoot location. To calculate DLI(ref), DLI and DPHOT, the radiation field surrounding a shoot in the canopy was first modeled using simulated directional distributions of incoming PAR on a clear and an overcast day, and estimates of canopy gap fraction in different directions provided by hemispherical photographs. A model of shoot geometry and measured data on shoot structure and photosynthetic parameters were used to simulate the distribution of PAR irradiance on the needle surface area of the shoot. Photosynthetic efficiency (epsilon) was separated into light-interception efficiency (epsilon(I) = DLI/DLI(ref)) and conversion efficiency (epsilon(PHOT) = DPHOT/DLI). This allowed us to quantify separately the effect of structural acclimation on the efficiency of photosynthetic light capture (epsilon(l)), and the effect of physiological acclimation on conversion efficiency (epsilon(PHOT)). The value of epsilon increased from the top to the bottom of the canopy. The increase was largely explained by structural acclimation (higher epsilon(I)) of the shade shoots. The value of epsilon(PHOT) of shade foliage was similar to that of sun foliage. Given these efficiencies, the clear-day value of DPHOT for a sun shoot transferred to shade was only half that of a shade shoot at its original position. The method presented here provides a tool for quantitatively estimating the role of acclimation in total canopy photosynthesis.</abstract><cop>Canada</cop><pmid>11498328</pmid><doi>10.1093/treephys/21.12-13.805</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Light Mathematics Models, Biological Photosynthesis - physiology Pinus - anatomy & histology Pinus - physiology Pinus sylvestris Plant Leaves - anatomy & histology Plant Leaves - physiology Plant Shoots - anatomy & histology Plant Shoots - physiology Trees - anatomy & histology Trees - physiology |
title | Shoot structure and photosynthetic efficiency along the light gradient in a Scots pine canopy |
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