Cavitation vulnerability in roots and shoots: does Populus euphratica Oliv., a poplar from arid areas of Central Asia, differ from other poplar species?

Populus euphratica is a poplar species growing in arid regions of Central Asia, where its distribution remains nevertheless restricted to river-banks or to areas with an access to deep water tables. To test whether the hydraulic architecture of this species differs from that of other poplars with re...

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Veröffentlicht in:Journal of experimental botany 2005-08, Vol.56 (418), p.2003-2010
Hauptverfasser: Hukin, D., Cochard, H., Dreyer, E., Thiec, D. Le, Bogeat-Triboulot, M. B.
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container_end_page 2010
container_issue 418
container_start_page 2003
container_title Journal of experimental botany
container_volume 56
creator Hukin, D.
Cochard, H.
Dreyer, E.
Thiec, D. Le
Bogeat-Triboulot, M. B.
description Populus euphratica is a poplar species growing in arid regions of Central Asia, where its distribution remains nevertheless restricted to river-banks or to areas with an access to deep water tables. To test whether the hydraulic architecture of this species differs from that of other poplars with respect to this ecological distribution, the vulnerability to cavitation of P. euphratica was compared with that of P. alba and of P. trichocarpa×koreana. The occurrence of a potential hydraulic segmentation through cavitation was also investigated by assessing the vulnerability of roots, stems, and leaf mid-rib veins. Cryo-scanning electron microscopy (cryo-SEM) was used to assess the level of embolism in fine roots and leaf mid-ribs and a low pressure flowmeter (LPFM) was used for stems and main roots. The cryo-SEM technique was validated against LPFM measurements on paired samples. In P. alba and P. trichocarpa×koreana, leaf mid-ribs were more vulnerable to cavitation than stems and roots. In P. euphratica, leaf mid-ribs and stems were equally vulnerable and, contrary to what has been observed in other species, roots were significantly less vulnerable than shoots. P. euphratica was by far the most vulnerable. The water potential inducing 50% loss of conductivity in stems was close to −0.7 MPa, against ∼ −1.45 MPa for the two others species. Such a large vulnerability was confirmed by recording losses of conductivity during a gradual drought. Moreover, significant stem embolism was recorded before stomatal closure, indicating the lack of an efficient safety margin for hydraulic functions in this species. Embolism was not reversed by rewatering. These observations are discussed with respect to the ecology of P. euphratica.
doi_str_mv 10.1093/jxb/eri198
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Le</creatorcontrib><creatorcontrib>Bogeat-Triboulot, M. B.</creatorcontrib><title>Cavitation vulnerability in roots and shoots: does Populus euphratica Oliv., a poplar from arid areas of Central Asia, differ from other poplar species?</title><title>Journal of experimental botany</title><addtitle>J. Exp. Bot</addtitle><description>Populus euphratica is a poplar species growing in arid regions of Central Asia, where its distribution remains nevertheless restricted to river-banks or to areas with an access to deep water tables. To test whether the hydraulic architecture of this species differs from that of other poplars with respect to this ecological distribution, the vulnerability to cavitation of P. euphratica was compared with that of P. alba and of P. trichocarpa×koreana. The occurrence of a potential hydraulic segmentation through cavitation was also investigated by assessing the vulnerability of roots, stems, and leaf mid-rib veins. Cryo-scanning electron microscopy (cryo-SEM) was used to assess the level of embolism in fine roots and leaf mid-ribs and a low pressure flowmeter (LPFM) was used for stems and main roots. The cryo-SEM technique was validated against LPFM measurements on paired samples. In P. alba and P. trichocarpa×koreana, leaf mid-ribs were more vulnerable to cavitation than stems and roots. In P. euphratica, leaf mid-ribs and stems were equally vulnerable and, contrary to what has been observed in other species, roots were significantly less vulnerable than shoots. P. euphratica was by far the most vulnerable. The water potential inducing 50% loss of conductivity in stems was close to −0.7 MPa, against ∼ −1.45 MPa for the two others species. Such a large vulnerability was confirmed by recording losses of conductivity during a gradual drought. 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Psychology</subject><subject>hydraulic architecture</subject><subject>Hydraulic conductivity</subject><subject>hydraulic segmentation</subject><subject>Hydraulics</subject><subject>Hydrostatic Pressure</subject><subject>Life Sciences</subject><subject>phreatophyte</subject><subject>Plant Leaves - physiology</subject><subject>Plant Leaves - ultrastructure</subject><subject>Plant roots</subject><subject>Plant Roots - physiology</subject><subject>Plant Roots - ultrastructure</subject><subject>Plant Shoots - physiology</subject><subject>Plant Shoots - ultrastructure</subject><subject>Plants</subject><subject>Populus</subject><subject>Populus - physiology</subject><subject>Populus - ultrastructure</subject><subject>Pressure</subject><subject>Research Papers</subject><subject>Soil water</subject><subject>Species Specificity</subject><subject>Stems</subject><subject>stomatal conductance</subject><subject>Vegetal Biology</subject><subject>Water - physiology</subject><subject>water relations</subject><subject>Water relations, transpiration, stomata</subject><subject>Xylem</subject><issn>0022-0957</issn><issn>1460-2431</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkVGL1DAQx4so3nn64rsSBAXlejdpmrT1RZbFc5XFE1Q4fAnTJGWzdpuatMvdN_HjmqVlD3yZGeb_mxmGf5I8p3BBoWKX29v60nhLq_JBckpzAWmWM_owOQXIshQqXpwkT0LYAgAHzh8nJ5RXoihKOE3-LnFvBxys68h-bDvjsbatHe6I7Yh3bggEO03C5lC-J9qZQL65fmzHQMzYb3wcVUiuW7u_OCdIete36Enj3Y6gtzoGg4G4hixNN3hsySJYPCfaNo2ZOTdsYjlPht4oa8KHp8mjBttgns35LPl59fHHcpWurz99Xi7WqeKsHFJqkAvOeAY6qyvRUI7cVGXOtao1iPin0MBUY5TSSnA0DbC60cBrpsocDTtL3k57N9jK3tsd-jvp0MrVYi0PPaC0rCjL9zSybya29-7PaMIgdzYo07bYGTcGKUpgjOc8gq_-A7du9F38Q2aMAwjBRITeTZDyLgRvmuN5CvJgrIzGysnYCL-cN471zuh7dHYyAq9nAIPCtvHYKRvuOVFVAorD1RcTtw2D80c9y4HRrMyjnk66DYO5Perof0tRsILL1c0v-f3rlxt6xTIJ7B9xasYp</recordid><startdate>20050801</startdate><enddate>20050801</enddate><creator>Hukin, D.</creator><creator>Cochard, H.</creator><creator>Dreyer, E.</creator><creator>Thiec, D. 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Le</au><au>Bogeat-Triboulot, M. B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cavitation vulnerability in roots and shoots: does Populus euphratica Oliv., a poplar from arid areas of Central Asia, differ from other poplar species?</atitle><jtitle>Journal of experimental botany</jtitle><addtitle>J. Exp. Bot</addtitle><date>2005-08-01</date><risdate>2005</risdate><volume>56</volume><issue>418</issue><spage>2003</spage><epage>2010</epage><pages>2003-2010</pages><issn>0022-0957</issn><eissn>1460-2431</eissn><coden>JEBOA6</coden><abstract>Populus euphratica is a poplar species growing in arid regions of Central Asia, where its distribution remains nevertheless restricted to river-banks or to areas with an access to deep water tables. To test whether the hydraulic architecture of this species differs from that of other poplars with respect to this ecological distribution, the vulnerability to cavitation of P. euphratica was compared with that of P. alba and of P. trichocarpa×koreana. The occurrence of a potential hydraulic segmentation through cavitation was also investigated by assessing the vulnerability of roots, stems, and leaf mid-rib veins. Cryo-scanning electron microscopy (cryo-SEM) was used to assess the level of embolism in fine roots and leaf mid-ribs and a low pressure flowmeter (LPFM) was used for stems and main roots. The cryo-SEM technique was validated against LPFM measurements on paired samples. In P. alba and P. trichocarpa×koreana, leaf mid-ribs were more vulnerable to cavitation than stems and roots. In P. euphratica, leaf mid-ribs and stems were equally vulnerable and, contrary to what has been observed in other species, roots were significantly less vulnerable than shoots. P. euphratica was by far the most vulnerable. The water potential inducing 50% loss of conductivity in stems was close to −0.7 MPa, against ∼ −1.45 MPa for the two others species. Such a large vulnerability was confirmed by recording losses of conductivity during a gradual drought. Moreover, significant stem embolism was recorded before stomatal closure, indicating the lack of an efficient safety margin for hydraulic functions in this species. Embolism was not reversed by rewatering. These observations are discussed with respect to the ecology of P. euphratica.</abstract><cop>Oxford</cop><pub>Oxford University Press</pub><pmid>15967780</pmid><doi>10.1093/jxb/eri198</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0003-3015-488X</orcidid><orcidid>https://orcid.org/0000-0002-4204-551X</orcidid><orcidid>https://orcid.org/0000-0002-2727-7072</orcidid><oa>free_for_read</oa></addata></record>
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subjects Agronomy. Soil science and plant productions
Asia
Biological and medical sciences
Botanics
Cavitation flow
Drought
Economic plant physiology
embolism
Embolisms
Fundamental and applied biological sciences. Psychology
hydraulic architecture
Hydraulic conductivity
hydraulic segmentation
Hydraulics
Hydrostatic Pressure
Life Sciences
phreatophyte
Plant Leaves - physiology
Plant Leaves - ultrastructure
Plant roots
Plant Roots - physiology
Plant Roots - ultrastructure
Plant Shoots - physiology
Plant Shoots - ultrastructure
Plants
Populus
Populus - physiology
Populus - ultrastructure
Pressure
Research Papers
Soil water
Species Specificity
Stems
stomatal conductance
Vegetal Biology
Water - physiology
water relations
Water relations, transpiration, stomata
Xylem
title Cavitation vulnerability in roots and shoots: does Populus euphratica Oliv., a poplar from arid areas of Central Asia, differ from other poplar species?
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