Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress
Identifieur interne : 000760 ( PascalFrancis/Checkpoint ); précédent : 000759; suivant : 000761Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress
Auteurs : M. M. A. Gomes [Brésil] ; A. M. M. A. Lagoa [Brésil] ; E. C. Machado [Brésil] ; C. L. Medina [Brésil]Source :
- Plant growth regulation [ 0167-6903 ] ; 2003.
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Abstract
'Pêra' sweet orange plants (Citrus sinensis L. Osbeck) grafted on 'Rangpur' lime rootstock (1 year-old) (Citrus limonia Osbeck) were inoculated with Xylella fastidiosa, a xylem-limited bacterium pathogen, which causes Citrus Variegated Chlorosis (CVC). Since it was known that water deficiency in the field enhances CVC-effects on the plant, the trees were submitted to three cycles of water stress during a one year period (March and October, 1998; and April, 1999) and divided in four treatments: healthy plants (HP); water-stressed healthy plants (WSHP); diseased plants (DP) and water-stressed diseased plants (WSDP). Stomatal conductance (gs) of water-stressed diseased plants decreased in the first and second cycles of water deficiency, as the stress was increasing. The low stomatal conductance verified may be due to the high concentrations of abscisic acid (ABA) found in these plants. In the third cycle, values of gs in diseased plants were, usually, lower than in the healthy ones. In healthy plants, gs was reduced when these plants were submitted to water deficiency, independently of the cycle. The drop in leaf water potential in healthy plants was faster after irrigation was withheld, because healthy plants transpired more and, therefore, the water content of the substrate decreased more quickly. When the irrigation of WSDP was withheld in the third cycle, it was not possible to detect increases in ABA contents, suggesting that other factors could be acting to diminish the stomatal conductance in these plants. The presence of Xylella fastidiosa did not induce an increase in indole-3-acetic acid content in the leaves. After three cycles of water deficiency, the concentrations of indole-3-acetic acid in WSHP and WSDP were lower than those concentrations in the irrigated controls on the day water stress was more severe.
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M. A." last="Gomes">M. M. A. Gomes</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Setor de Fisiologia Vegetal/CCTA/LMGV, Universidade Estadual do Norte Fluminense, Av. Alberto Lamego, 2000</s1><s2>Cep: 28015-620 Campos dos Goytacazes, RJ</s2><s3>BRA</s3><sZ>1 aut.</sZ></inist:fA14><country>Brésil</country><placeName><region type="state">État de Rio de Janeiro</region></placeName></affiliation></author><author><name sortKey="Lagoa, A M M A" sort="Lagoa, A M M A" uniqKey="Lagoa A" first="A. M. M. A." last="Lagoa">A. M. M. A. Lagoa</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Centro de Ecofisiologia e Biofisica, Instituto Agronômico de Campinas</s1><s2>SP</s2><s3>BRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Brésil</country><placeName><region type="state">État de São Paulo</region></placeName></affiliation></author><author><name sortKey="Machado, E C" sort="Machado, E C" uniqKey="Machado E" first="E. C." last="Machado">E. C. Machado</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Centro de Ecofisiologia e Biofisica, Instituto Agronômico de Campinas</s1><s2>SP</s2><s3>BRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Brésil</country><placeName><region type="state">État de São Paulo</region></placeName></affiliation></author><author><name sortKey="Medina, C L" sort="Medina, C L" uniqKey="Medina C" first="C. L." last="Medina">C. L. Medina</name><affiliation wicri:level="2"><inist:fA14 i1="03"><s1>Departamento de Fisiologia Vegetal, Universidade Estadual de Campinas</s1><s2>SP</s2><s3>BRA</s3><sZ>4 aut.</sZ></inist:fA14><country>Brésil</country><placeName><region type="state">État de São Paulo</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Plant growth regulation</title><title level="j" type="abbreviated">Plant growth regul.</title><idno type="ISSN">0167-6903</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Plant growth regulation</title><title level="j" type="abbreviated">Plant growth regul.</title><idno type="ISSN">0167-6903</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abscisic acid</term><term>Biological accumulation</term><term>Citrus sinensis</term><term>Host agent relation</term><term>Stomatal conductance</term><term>Water deficit</term><term>Water regime</term><term>Xylem</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Relation hôte agent</term><term>Déficit hydrique</term><term>Xylème</term><term>Conductance stomatique</term><term>Accumulation biologique</term><term>Abscissique acide</term><term>Régime hydrique</term><term>Citrus sinensis</term><term>Citrus limonia</term><term>Xylella fastidiosa</term><term>Indole-3-acétique acide</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">'Pêra' sweet orange plants (Citrus sinensis L. Osbeck) grafted on 'Rangpur' lime rootstock (1 year-old) (Citrus limonia Osbeck) were inoculated with Xylella fastidiosa, a xylem-limited bacterium pathogen, which causes Citrus Variegated Chlorosis (CVC). Since it was known that water deficiency in the field enhances CVC-effects on the plant, the trees were submitted to three cycles of water stress during a one year period (March and October, 1998; and April, 1999) and divided in four treatments: healthy plants (HP); water-stressed healthy plants (WSHP); diseased plants (DP) and water-stressed diseased plants (WSDP). Stomatal conductance (g<sub>s</sub>) of water-stressed diseased plants decreased in the first and second cycles of water deficiency, as the stress was increasing. The low stomatal conductance verified may be due to the high concentrations of abscisic acid (ABA) found in these plants. In the third cycle, values of g<sub>s</sub> in diseased plants were, usually, lower than in the healthy ones. In healthy plants, g<sub>s</sub> was reduced when these plants were submitted to water deficiency, independently of the cycle. The drop in leaf water potential in healthy plants was faster after irrigation was withheld, because healthy plants transpired more and, therefore, the water content of the substrate decreased more quickly. When the irrigation of WSDP was withheld in the third cycle, it was not possible to detect increases in ABA contents, suggesting that other factors could be acting to diminish the stomatal conductance in these plants. The presence of Xylella fastidiosa did not induce an increase in indole-3-acetic acid content in the leaves. After three cycles of water deficiency, the concentrations of indole-3-acetic acid in WSHP and WSDP were lower than those concentrations in the irrigated controls on the day water stress was more severe.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0167-6903</s0></fA01><fA02 i1="01"><s0>PGRED3</s0></fA02><fA03 i2="1"><s0>Plant growth regul.</s0></fA03><fA05><s2>39</s2></fA05><fA06><s2>3</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress</s1></fA08><fA11 i1="01" i2="1"><s1>GOMES (M. M. A.)</s1></fA11><fA11 i1="02" i2="1"><s1>LAGOA (A. M. M. A.)</s1></fA11><fA11 i1="03" i2="1"><s1>MACHADO (E. C.)</s1></fA11><fA11 i1="04" i2="1"><s1>MEDINA (C. L.)</s1></fA11><fA14 i1="01"><s1>Setor de Fisiologia Vegetal/CCTA/LMGV, Universidade Estadual do Norte Fluminense, Av. 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In healthy plants, g<sub>s</sub> was reduced when these plants were submitted to water deficiency, independently of the cycle. The drop in leaf water potential in healthy plants was faster after irrigation was withheld, because healthy plants transpired more and, therefore, the water content of the substrate decreased more quickly. When the irrigation of WSDP was withheld in the third cycle, it was not possible to detect increases in ABA contents, suggesting that other factors could be acting to diminish the stomatal conductance in these plants. The presence of Xylella fastidiosa did not induce an increase in indole-3-acetic acid content in the leaves. 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M. A." last="Gomes">M. M. A. Gomes</name></region><name sortKey="Lagoa, A M M A" sort="Lagoa, A M M A" uniqKey="Lagoa A" first="A. M. M. A." last="Lagoa">A. M. M. A. Lagoa</name><name sortKey="Machado, E C" sort="Machado, E C" uniqKey="Machado E" first="E. C." last="Machado">E. C. Machado</name><name sortKey="Medina, C L" sort="Medina, C L" uniqKey="Medina C" first="C. L." last="Medina">C. L. Medina</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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