Variation in drought resistance, drought acclimation and water conservation in four willow cultivars used for biomass production.
Identifieur interne : 001A42 ( Main/Corpus ); précédent : 001A41; suivant : 001A43Variation in drought resistance, drought acclimation and water conservation in four willow cultivars used for biomass production.
Auteurs : Jenny Wikberg ; Erling OgrenSource :
- Tree physiology [ 0829-318X ] ; 2007.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Water.
- growth & development : Salix.
- physiology : Acclimatization, Plant Leaves, Salix, Xylem.
- Biomass.
Abstract
Growth and water-use parameters of four willow (Salix spp.) clones grown in a moderate drought regime or with ample water supply were determined to characterize their water-use efficiency, drought resistance and capacity for drought acclimation. At the end of the 10-week, outdoor pot experiment, clonal differences were observed in: (1) water-use efficiency of aboveground biomass production (WUE); (2) resistance to xylem cavitation; and (3) stomatal conductance to leaf-specific, whole-plant hydraulic conductance ratio (g(st)/K(P); an indicator of water balance). Across clones and regimes, WUE was positively correlated with the assimilation rate to stomatal conductance ratio (A/g(st)), a measure of instantaneous water-use efficiency. Both of these water-use efficiency indicators were generally higher in drought-treated trees compared with well-watered trees. However, the between-treatment differences in (shoot-based) WUE were smaller than expected, considering the differences in A/g(st) for two of the clones, possibly because plants reallocated dry mass from shoots to roots when subject to drought. Higher root hydraulic conductance to shoot hydraulic conductance ratios (K(R)/K(S)) during drought supports this hypothesis. The same clones were also the most sensitive to xylem cavitation and, accordingly, showed the strongest reduction in g(st)/K(P) in response to drought. Drought acclimation was manifested in decreased g(st), g(st)/K(P), osmotic potential and leaf area to vessel internal cross-sectional area ratio, and increased K(R), K(P) and WUE. Increased resistance to stem xylem cavitation in response to drought was observed in only one clone. It is concluded that WUE and drought resistance traits are inter-linked and that both may be enhanced by selection and breeding.
DOI: 10.1093/treephys/27.9.1339
PubMed: 17545133
Links to Exploration step
pubmed:17545133Le document en format XML
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<author><name sortKey="Wikberg, Jenny" sort="Wikberg, Jenny" uniqKey="Wikberg J" first="Jenny" last="Wikberg">Jenny Wikberg</name>
<affiliation><nlm:affiliation>Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden.</nlm:affiliation>
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<author><name sortKey="Ogren, Erling" sort="Ogren, Erling" uniqKey="Ogren E" first="Erling" last="Ogren">Erling Ogren</name>
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<author><name sortKey="Wikberg, Jenny" sort="Wikberg, Jenny" uniqKey="Wikberg J" first="Jenny" last="Wikberg">Jenny Wikberg</name>
<affiliation><nlm:affiliation>Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden.</nlm:affiliation>
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<series><title level="j">Tree physiology</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acclimatization (physiology)</term>
<term>Biomass (MeSH)</term>
<term>Plant Leaves (physiology)</term>
<term>Salix (growth & development)</term>
<term>Salix (physiology)</term>
<term>Water (physiology)</term>
<term>Xylem (physiology)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="physiology" xml:lang="en"><term>Water</term>
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<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Salix</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Acclimatization</term>
<term>Plant Leaves</term>
<term>Salix</term>
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<front><div type="abstract" xml:lang="en">Growth and water-use parameters of four willow (Salix spp.) clones grown in a moderate drought regime or with ample water supply were determined to characterize their water-use efficiency, drought resistance and capacity for drought acclimation. At the end of the 10-week, outdoor pot experiment, clonal differences were observed in: (1) water-use efficiency of aboveground biomass production (WUE); (2) resistance to xylem cavitation; and (3) stomatal conductance to leaf-specific, whole-plant hydraulic conductance ratio (g(st)/K(P); an indicator of water balance). Across clones and regimes, WUE was positively correlated with the assimilation rate to stomatal conductance ratio (A/g(st)), a measure of instantaneous water-use efficiency. Both of these water-use efficiency indicators were generally higher in drought-treated trees compared with well-watered trees. However, the between-treatment differences in (shoot-based) WUE were smaller than expected, considering the differences in A/g(st) for two of the clones, possibly because plants reallocated dry mass from shoots to roots when subject to drought. Higher root hydraulic conductance to shoot hydraulic conductance ratios (K(R)/K(S)) during drought supports this hypothesis. The same clones were also the most sensitive to xylem cavitation and, accordingly, showed the strongest reduction in g(st)/K(P) in response to drought. Drought acclimation was manifested in decreased g(st), g(st)/K(P), osmotic potential and leaf area to vessel internal cross-sectional area ratio, and increased K(R), K(P) and WUE. Increased resistance to stem xylem cavitation in response to drought was observed in only one clone. It is concluded that WUE and drought resistance traits are inter-linked and that both may be enhanced by selection and breeding.</div>
</front>
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<Month>11</Month>
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<DateRevised><Year>2019</Year>
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<Issue>9</Issue>
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<Month>Sep</Month>
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<Title>Tree physiology</Title>
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<Pagination><MedlinePgn>1339-46</MedlinePgn>
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<Abstract><AbstractText>Growth and water-use parameters of four willow (Salix spp.) clones grown in a moderate drought regime or with ample water supply were determined to characterize their water-use efficiency, drought resistance and capacity for drought acclimation. At the end of the 10-week, outdoor pot experiment, clonal differences were observed in: (1) water-use efficiency of aboveground biomass production (WUE); (2) resistance to xylem cavitation; and (3) stomatal conductance to leaf-specific, whole-plant hydraulic conductance ratio (g(st)/K(P); an indicator of water balance). Across clones and regimes, WUE was positively correlated with the assimilation rate to stomatal conductance ratio (A/g(st)), a measure of instantaneous water-use efficiency. Both of these water-use efficiency indicators were generally higher in drought-treated trees compared with well-watered trees. However, the between-treatment differences in (shoot-based) WUE were smaller than expected, considering the differences in A/g(st) for two of the clones, possibly because plants reallocated dry mass from shoots to roots when subject to drought. Higher root hydraulic conductance to shoot hydraulic conductance ratios (K(R)/K(S)) during drought supports this hypothesis. The same clones were also the most sensitive to xylem cavitation and, accordingly, showed the strongest reduction in g(st)/K(P) in response to drought. Drought acclimation was manifested in decreased g(st), g(st)/K(P), osmotic potential and leaf area to vessel internal cross-sectional area ratio, and increased K(R), K(P) and WUE. Increased resistance to stem xylem cavitation in response to drought was observed in only one clone. It is concluded that WUE and drought resistance traits are inter-linked and that both may be enhanced by selection and breeding.</AbstractText>
</Abstract>
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<AffiliationInfo><Affiliation>Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden.</Affiliation>
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<MeshHeading><DescriptorName UI="D018533" MajorTopicYN="N">Biomass</DescriptorName>
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<MeshHeading><DescriptorName UI="D018515" MajorTopicYN="N">Plant Leaves</DescriptorName>
<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
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<MeshHeading><DescriptorName UI="D032108" MajorTopicYN="N">Salix</DescriptorName>
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<MeshHeading><DescriptorName UI="D052584" MajorTopicYN="N">Xylem</DescriptorName>
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