Linking Turgor with ABA Biosynthesis: Implications for Stomatal Responses to Vapor Pressure Deficit across Land Plants
Stomatal responses to changes in vapor pressure deficit (VPD) constitute the predominant form of daytime gas-exchange regulation in plants. Stomatal closure in response to increased VPD is driven by the rapid up-regulation of foliar abscisic acid (ABA) biosynthesis and ABA levels in angiosperms; how...
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Veröffentlicht in: | Plant physiology (Bethesda) 2016-07, Vol.171 (3), p.2008-2016 |
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container_title | Plant physiology (Bethesda) |
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creator | McAdam, Scott A.M. Brodribb, Timothy J. |
description | Stomatal responses to changes in vapor pressure deficit (VPD) constitute the predominant form of daytime gas-exchange regulation in plants. Stomatal closure in response to increased VPD is driven by the rapid up-regulation of foliar abscisic acid (ABA) biosynthesis and ABA levels in angiosperms; however, very little is known about the physiological trigger for this increase in ABA biosynthesis at increased VPD. Using a novel method of modifying leaf cell turgor by the application of external pressures, we test whether changes in turgor pressure can trigger increases in foliar ABA levels over 20 min, a period of time most relevant to the stomatal response to VPD. We found in angiosperm species that the biosynthesis of ABA was triggered by reductions in leaf turgor, and in two species tested, that a higher sensitivity of ABA synthesis to leaf turgor corresponded with a higher stomatal sensitivity to VPD. In contrast, representative species from nonflowering plant lineages did not show a rapid turgor-triggered increase in foliar ABA levels, which is consistent with previous studies demonstrating passive stomatal responses to changes in VPD in these lineages. Our method provides a new tool for characterizing the response of stomata to water availability. |
doi_str_mv | 10.1104/pp.16.00380 |
format | Article |
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In contrast, representative species from nonflowering plant lineages did not show a rapid turgor-triggered increase in foliar ABA levels, which is consistent with previous studies demonstrating passive stomatal responses to changes in VPD in these lineages. 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Stomatal closure in response to increased VPD is driven by the rapid up-regulation of foliar abscisic acid (ABA) biosynthesis and ABA levels in angiosperms; however, very little is known about the physiological trigger for this increase in ABA biosynthesis at increased VPD. Using a novel method of modifying leaf cell turgor by the application of external pressures, we test whether changes in turgor pressure can trigger increases in foliar ABA levels over 20 min, a period of time most relevant to the stomatal response to VPD. We found in angiosperm species that the biosynthesis of ABA was triggered by reductions in leaf turgor, and in two species tested, that a higher sensitivity of ABA synthesis to leaf turgor corresponded with a higher stomatal sensitivity to VPD. In contrast, representative species from nonflowering plant lineages did not show a rapid turgor-triggered increase in foliar ABA levels, which is consistent with previous studies demonstrating passive stomatal responses to changes in VPD in these lineages. Our method provides a new tool for characterizing the response of stomata to water availability.</description><subject>Abscisic Acid - biosynthesis</subject><subject>ECOPHYSIOLOGY AND SUSTAINABILITY</subject><subject>Embryophyta - physiology</subject><subject>Magnoliopsida - physiology</subject><subject>Plant Leaves - physiology</subject><subject>Plant Stomata - physiology</subject><subject>Vapor Pressure</subject><issn>0032-0889</issn><issn>1532-2548</issn><issn>1532-2548</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpFkE1v1DAURS1ERYeBFWuQl0gow_NX4mE3LYVWGokKCtvI49itSxK7fg5V_31Dp5TVk-47uro6hLxhsGIM5MeUVqxeAQgNz8iCKcErrqR-ThZzxivQen1IXiJeAwATTL4gh7zhoHktF-TPNoy_w3hJL6Z8GTO9DeWKbo429ChEvBvLlcOAn-jZkPpgTQlxROpn7keJgymmp98dpjl0SEukv0yaf-fZIU7Z0c_OBxsKNTZHRLo1Y0fPezMWfEUOvOnRvX68S_Lzy8nF8Wm1_fb17HizrayQulRcKtDM1dIrK6Vwvmsk8No3Xe39ziutHbNKdjsrO5DMK6WZarhVjecK1kYsyft9b8rxZnJY2iGgdf08wsUJW6aBN0KsZ2tL8mGPPozNzrcph8Hku5ZB-1d0m1LL6vZB9Ey_eyyedoPrnth_Zmfg7R64xhLz_7_UsJaNFvc7LoL0</recordid><startdate>20160701</startdate><enddate>20160701</enddate><creator>McAdam, Scott A.M.</creator><creator>Brodribb, Timothy J.</creator><general>American Society of Plant Biologists</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>20160701</creationdate><title>Linking Turgor with ABA Biosynthesis: Implications for Stomatal Responses to Vapor Pressure Deficit across Land Plants</title><author>McAdam, Scott A.M. ; Brodribb, Timothy J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c348t-245081e64f5c443efd74026f7d6ffbf588e1c54dbc4d041f5581572c57f2509a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Abscisic Acid - biosynthesis</topic><topic>ECOPHYSIOLOGY AND SUSTAINABILITY</topic><topic>Embryophyta - physiology</topic><topic>Magnoliopsida - physiology</topic><topic>Plant Leaves - physiology</topic><topic>Plant Stomata - physiology</topic><topic>Vapor Pressure</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>McAdam, Scott A.M.</creatorcontrib><creatorcontrib>Brodribb, Timothy J.</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 physiology (Bethesda)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>McAdam, Scott A.M.</au><au>Brodribb, Timothy J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Linking Turgor with ABA Biosynthesis: Implications for Stomatal Responses to Vapor Pressure Deficit across Land Plants</atitle><jtitle>Plant physiology (Bethesda)</jtitle><addtitle>Plant Physiol</addtitle><date>2016-07-01</date><risdate>2016</risdate><volume>171</volume><issue>3</issue><spage>2008</spage><epage>2016</epage><pages>2008-2016</pages><issn>0032-0889</issn><issn>1532-2548</issn><eissn>1532-2548</eissn><abstract>Stomatal responses to changes in vapor pressure deficit (VPD) constitute the predominant form of daytime gas-exchange regulation in plants. Stomatal closure in response to increased VPD is driven by the rapid up-regulation of foliar abscisic acid (ABA) biosynthesis and ABA levels in angiosperms; however, very little is known about the physiological trigger for this increase in ABA biosynthesis at increased VPD. Using a novel method of modifying leaf cell turgor by the application of external pressures, we test whether changes in turgor pressure can trigger increases in foliar ABA levels over 20 min, a period of time most relevant to the stomatal response to VPD. We found in angiosperm species that the biosynthesis of ABA was triggered by reductions in leaf turgor, and in two species tested, that a higher sensitivity of ABA synthesis to leaf turgor corresponded with a higher stomatal sensitivity to VPD. 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source | MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; JSTOR Archive Collection A-Z Listing; Oxford University Press Journals All Titles (1996-Current) |
subjects | Abscisic Acid - biosynthesis ECOPHYSIOLOGY AND SUSTAINABILITY Embryophyta - physiology Magnoliopsida - physiology Plant Leaves - physiology Plant Stomata - physiology Vapor Pressure |
title | Linking Turgor with ABA Biosynthesis: Implications for Stomatal Responses to Vapor Pressure Deficit across Land Plants |
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