OrangerV1, PascalFrancis, Corpus, bibRecord, 000763

Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress

Identifieur interne : 000763 ( PascalFrancis/Corpus ); précédent : 000762; suivant : 000764

Abscisic 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 ; A. M. M. A. Lagoa ; E. C. Machado ; C. L. Medina

Source :

Plant growth regulation [ 0167-6903 ] ; 2003.

RBID : Pascal:03-0281068

Descripteurs français

Pascal (Inist)
- Relation hôte agent, Déficit hydrique, Xylème, Conductance stomatique, Accumulation biologique, Abscissique acide, Régime hydrique, Citrus sinensis, Citrus limonia, Xylella fastidiosa, Indole-3-acétique acide.

English descriptors

KwdEn :
- Abscisic acid, Biological accumulation, Citrus sinensis, Host agent relation, Stomatal conductance, Water deficit, Water regime, Xylem.

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 (g_s) 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_s in diseased plants were, usually, lower than in the healthy ones. In healthy plants, g_s 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.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A11	`02`	`1`		`@1 LAGOA (A. M. M. A.)`
A11	`03`	`1`		`@1 MACHADO (E. C.)`
A11	`04`	`1`		`@1 MEDINA (C. L.)`
A14	`01`			`@1 Setor de Fisiologia Vegetal/CCTA/LMGV, Universidade Estadual do Norte Fluminense, Av. Alberto Lamego, 2000 @2 Cep: 28015-620 Campos dos Goytacazes, RJ @3 BRA @Z 1 aut.`
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C01	`01`		`ENG`	@0 '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_s) 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_s in diseased plants were, usually, lower than in the healthy ones. In healthy plants, g_s 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.
C02	`01`	`X`		`@0 002A34F02`
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C03	`01`	`X`	`ENG`	`@0 Host agent relation @5 01`
C03	`01`	`X`	`SPA`	`@0 Relación huesped agente @5 01`
C03	`02`	`X`	`FRE`	`@0 Déficit hydrique @5 02`
C03	`02`	`X`	`ENG`	`@0 Water deficit @5 02`
C03	`02`	`X`	`SPA`	`@0 Deficiencia agua @5 02`
C03	`03`	`X`	`FRE`	`@0 Xylème @5 03`
C03	`03`	`X`	`ENG`	`@0 Xylem @5 03`
C03	`03`	`X`	`SPA`	`@0 Xilema @5 03`
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C03	`04`	`X`	`ENG`	`@0 Stomatal conductance @5 04`
C03	`04`	`X`	`SPA`	`@0 Conductancia estomática @5 04`
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C03	`05`	`X`	`ENG`	`@0 Biological accumulation @5 05`
C03	`05`	`X`	`SPA`	`@0 Acumulación biológica @5 05`
C03	`06`	`X`	`FRE`	`@0 Abscissique acide @2 NK @2 FF @5 06`
C03	`06`	`X`	`ENG`	`@0 Abscisic acid @2 NK @2 FF @5 06`
C03	`06`	`X`	`SPA`	`@0 Abscísico ácido @2 NK @2 FF @5 06`
C03	`07`	`X`	`FRE`	`@0 Régime hydrique @5 07`
C03	`07`	`X`	`ENG`	`@0 Water regime @5 07`
C03	`07`	`X`	`SPA`	`@0 Régimen hídrico @5 07`
C03	`08`	`X`	`FRE`	`@0 Citrus sinensis @2 NS @5 10`
C03	`08`	`X`	`ENG`	`@0 Citrus sinensis @2 NS @5 10`
C03	`08`	`X`	`SPA`	`@0 Citrus sinensis @2 NS @5 10`
C03	`09`	`X`	`FRE`	`@0 Citrus limonia @2 NS @4 INC @5 72`
C03	`10`	`X`	`FRE`	`@0 Xylella fastidiosa @2 NS @4 INC @5 73`
C03	`11`	`X`	`FRE`	`@0 Indole-3-acétique acide @2 FF @4 INC @5 83 @6 Indole-«3»-acétique acide`
C07	`01`	`X`	`FRE`	`@0 Rutaceae @2 NS`
C07	`01`	`X`	`ENG`	`@0 Rutaceae @2 NS`
C07	`01`	`X`	`SPA`	`@0 Rutaceae @2 NS`
C07	`02`	`X`	`FRE`	`@0 Dicotyledones @2 NS`
C07	`02`	`X`	`ENG`	`@0 Dicotyledones @2 NS`
C07	`02`	`X`	`SPA`	`@0 Dicotyledones @2 NS`
C07	`03`	`X`	`FRE`	`@0 Angiospermae @2 NS`
C07	`03`	`X`	`ENG`	`@0 Angiospermae @2 NS`
C07	`03`	`X`	`SPA`	`@0 Angiospermae @2 NS`
C07	`04`	`X`	`FRE`	`@0 Spermatophyta @2 NS`
C07	`04`	`X`	`ENG`	`@0 Spermatophyta @2 NS`
C07	`04`	`X`	`SPA`	`@0 Spermatophyta @2 NS`
C07	`05`	`X`	`FRE`	`@0 Phytopathogène @5 46`
C07	`05`	`X`	`ENG`	`@0 Plant pathogen @5 46`
C07	`05`	`X`	`SPA`	`@0 Fitopatógeno @5 46`
C07	`06`	`X`	`FRE`	`@0 Bactérie @5 47`
C07	`06`	`X`	`ENG`	`@0 Bacteria @5 47`
C07	`06`	`X`	`SPA`	`@0 Bacteria @5 47`
C07	`07`	`X`	`FRE`	`@0 Agrume @5 48`
C07	`07`	`X`	`ENG`	`@0 Citrus fruit @5 48`
C07	`07`	`X`	`SPA`	`@0 Agrios @5 48`
C07	`08`	`X`	`FRE`	`@0 Indoleacétique acide @2 NK @5 50`
C07	`08`	`X`	`ENG`	`@0 Indoleacetic acid @2 NK @5 50`
C07	`08`	`X`	`SPA`	`@0 Indoloacetico ácido @2 NK @5 50`
C07	`09`	`X`	`FRE`	`@0 Substance croissance végétal @5 51`
C07	`09`	`X`	`ENG`	`@0 Plant growth substance @5 51`
C07	`09`	`X`	`SPA`	`@0 Substancia crecimiento vegetal @5 51`
N21				`@1 181`
N82				`@1 PSI`

Format Inist (serveur)

NO :	PASCAL 03-0281068 INIST
ET :	Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress
AU :	GOMES (M. M. A.); LAGOA (A. M. M. A.); MACHADO (E. C.); MEDINA (C. L.)
AF :	Setor de Fisiologia Vegetal/CCTA/LMGV, Universidade Estadual do Norte Fluminense, Av. Alberto Lamego, 2000/Cep: 28015-620 Campos dos Goytacazes, RJ/Brésil (1 aut.); Centro de Ecofisiologia e Biofisica, Instituto Agronômico de Campinas/SP/Brésil (2 aut., 3 aut.); Departamento de Fisiologia Vegetal, Universidade Estadual de Campinas/SP/Brésil (4 aut.)
DT :	Publication en série; Niveau analytique
SO :	Plant growth regulation; ISSN 0167-6903; Coden PGRED3; Pays-Bas; Da. 2003; Vol. 39; No. 3; Pp. 263-270; Bibl. 33 ref.
LA :	Anglais
EA :	'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_s) 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_s in diseased plants were, usually, lower than in the healthy ones. In healthy plants, g_s 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.
CC :	002A34F02
FD :	Relation hôte agent; Déficit hydrique; Xylème; Conductance stomatique; Accumulation biologique; Abscissique acide; Régime hydrique; Citrus sinensis; Citrus limonia; Xylella fastidiosa; Indole-3-acétique acide
FG :	Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Phytopathogène; Bactérie; Agrume; Indoleacétique acide; Substance croissance végétal
ED :	Host agent relation; Water deficit; Xylem; Stomatal conductance; Biological accumulation; Abscisic acid; Water regime; Citrus sinensis
EG :	Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Plant pathogen; Bacteria; Citrus fruit; Indoleacetic acid; Plant growth substance
SD :	Relación huesped agente; Deficiencia agua; Xilema; Conductancia estomática; Acumulación biológica; Abscísico ácido; Régimen hídrico; Citrus sinensis
LO :	INIST-19375.354000110902640070
ID :	03-0281068

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Pascal:03-0281068

Le document en format XML

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<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>
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<fA64 i1="01" i2="1"><s0>Plant growth regulation</s0>
</fA64>
<fA66 i1="01"><s0>NLD</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>'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.</s0>
</fC01>
<fC02 i1="01" i2="X"><s0>002A34F02</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Relation hôte agent</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Host agent relation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Relación huesped agente</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Déficit hydrique</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Water deficit</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Deficiencia agua</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Xylème</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Xylem</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Xilema</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Conductance stomatique</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Stomatal conductance</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Conductancia estomática</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Accumulation biologique</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Biological accumulation</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Acumulación biológica</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Abscissique acide</s0>
<s2>NK</s2>
<s2>FF</s2>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Abscisic acid</s0>
<s2>NK</s2>
<s2>FF</s2>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Abscísico ácido</s0>
<s2>NK</s2>
<s2>FF</s2>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Régime hydrique</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Water regime</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Régimen hídrico</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Citrus limonia</s0>
<s2>NS</s2>
<s4>INC</s4>
<s5>72</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Xylella fastidiosa</s0>
<s2>NS</s2>
<s4>INC</s4>
<s5>73</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Indole-3-acétique acide</s0>
<s2>FF</s2>
<s4>INC</s4>
<s5>83</s5>
<s6>Indole-«3»-acétique acide</s6>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE"><s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG"><s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA"><s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="FRE"><s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="ENG"><s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="SPA"><s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="05" i2="X" l="FRE"><s0>Phytopathogène</s0>
<s5>46</s5>
</fC07>
<fC07 i1="05" i2="X" l="ENG"><s0>Plant pathogen</s0>
<s5>46</s5>
</fC07>
<fC07 i1="05" i2="X" l="SPA"><s0>Fitopatógeno</s0>
<s5>46</s5>
</fC07>
<fC07 i1="06" i2="X" l="FRE"><s0>Bactérie</s0>
<s5>47</s5>
</fC07>
<fC07 i1="06" i2="X" l="ENG"><s0>Bacteria</s0>
<s5>47</s5>
</fC07>
<fC07 i1="06" i2="X" l="SPA"><s0>Bacteria</s0>
<s5>47</s5>
</fC07>
<fC07 i1="07" i2="X" l="FRE"><s0>Agrume</s0>
<s5>48</s5>
</fC07>
<fC07 i1="07" i2="X" l="ENG"><s0>Citrus fruit</s0>
<s5>48</s5>
</fC07>
<fC07 i1="07" i2="X" l="SPA"><s0>Agrios</s0>
<s5>48</s5>
</fC07>
<fC07 i1="08" i2="X" l="FRE"><s0>Indoleacétique acide</s0>
<s2>NK</s2>
<s5>50</s5>
</fC07>
<fC07 i1="08" i2="X" l="ENG"><s0>Indoleacetic acid</s0>
<s2>NK</s2>
<s5>50</s5>
</fC07>
<fC07 i1="08" i2="X" l="SPA"><s0>Indoloacetico ácido</s0>
<s2>NK</s2>
<s5>50</s5>
</fC07>
<fC07 i1="09" i2="X" l="FRE"><s0>Substance croissance végétal</s0>
<s5>51</s5>
</fC07>
<fC07 i1="09" i2="X" l="ENG"><s0>Plant growth substance</s0>
<s5>51</s5>
</fC07>
<fC07 i1="09" i2="X" l="SPA"><s0>Substancia crecimiento vegetal</s0>
<s5>51</s5>
</fC07>
<fN21><s1>181</s1>
</fN21>
<fN82><s1>PSI</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 03-0281068 INIST</NO>
<ET>Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress</ET>
<AU>GOMES (M. M. A.); LAGOA (A. M. M. A.); MACHADO (E. C.); MEDINA (C. L.)</AU>
<AF>Setor de Fisiologia Vegetal/CCTA/LMGV, Universidade Estadual do Norte Fluminense, Av. Alberto Lamego, 2000/Cep: 28015-620 Campos dos Goytacazes, RJ/Brésil (1 aut.); Centro de Ecofisiologia e Biofisica, Instituto Agronômico de Campinas/SP/Brésil (2 aut., 3 aut.); Departamento de Fisiologia Vegetal, Universidade Estadual de Campinas/SP/Brésil (4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Plant growth regulation; ISSN 0167-6903; Coden PGRED3; Pays-Bas; Da. 2003; Vol. 39; No. 3; Pp. 263-270; Bibl. 33 ref.</SO>
<LA>Anglais</LA>
<EA>'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.</EA>
<CC>002A34F02</CC>
<FD>Relation hôte agent; Déficit hydrique; Xylème; Conductance stomatique; Accumulation biologique; Abscissique acide; Régime hydrique; Citrus sinensis; Citrus limonia; Xylella fastidiosa; Indole-3-acétique acide</FD>
<FG>Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Phytopathogène; Bactérie; Agrume; Indoleacétique acide; Substance croissance végétal</FG>
<ED>Host agent relation; Water deficit; Xylem; Stomatal conductance; Biological accumulation; Abscisic acid; Water regime; Citrus sinensis</ED>
<EG>Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Plant pathogen; Bacteria; Citrus fruit; Indoleacetic acid; Plant growth substance</EG>
<SD>Relación huesped agente; Deficiencia agua; Xilema; Conductancia estomática; Acumulación biológica; Abscísico ácido; Régimen hídrico; Citrus sinensis</SD>
<LO>INIST-19375.354000110902640070</LO>
<ID>03-0281068</ID>
</server>
</inist>
</record>

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Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress

Abscisic acid and indole-3-acetic acid contents in orange trees infected by Xylella fastidiosa and submitted to cycles of water stress

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