OrangerV1, PascalFrancis, Corpus, bibRecord, 000774

Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets

Identifieur interne : 000774 ( PascalFrancis/Corpus ); précédent : 000773; suivant : 000775

Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets

Auteurs : Camilo L. Medina ; Rogéria P. Souza ; Eduardo C. Machado ; Rafael V. Ribeiro ; José A. B. Silva

Source :

Scientia horticulturae [ 0304-4238 ] ; 2002.

RBID : Pascal:03-0187827

Descripteurs français

Pascal (Inist)
- Photosynthèse, Culture protégée, Ombrage(environnement), Filet, Aluminisation, Surface réfléchissante, Conductance stomatique, Rayonnement photosynthétiquement actif, Photoinhibition, Citrus sinensis, Transpiration, Propène polymère, Chlorophylle a, Assimilation nette, Brésil, Serre.

English descriptors

KwdEn :
- Aluminizing, Brazil, Chlorophyll a, Citrus sinensis, Greenhouse, Net, Net assimilation rate, Photoinhibition, Photosynthesis, Photosynthetically active radiation, Propylene polymer, Protected cultivation, Reflecting surface, Shading, Stomatal conductance, Transpiration.

Abstract

High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental effects on plant growth. The aim of this study was to evaluate the use of reflective aluminized polypropylene shading nets on photosynthetic performance of citrus plants, by measuring CO₂ assimilation, transpiration rate, stomatal conductance and chlorophyll a fluorescence. Incident photosynthetically active radiation (PAR) levels and leaf temperatures were reduced when the reflective nets were used. Higher stomatal conductance and higher CO₂ assimilation rates were observed in shaded plants, so that integrated daily net CO₂ uptake was approximately 20% higher than in exposed plants. The better performance of shaded plants, however, was observed only during the middle of the day, being PAR-limited in early morning and late afternoon. The reflective net was also effective in preventing photoinhibition of photosynthesis in shaded plants, which sustained higher maximum (F_v/F_m) and effective (ΔF/F'_m) quantum yield with higher apparent electron transport rates (ETRs) than exposed plants. Observed photoinhibition in exposed plants was transient, probably reflecting photosynthetic regulatory responses to excess absorbed light energy. Therefore, the results clearly showed that photosynthetic performance of citrus cultivated in greenhouses can be improved by the use of reflective nets. Favorable effects comprised not only the maintenance of proper stomatal aperture for gas exchange but also a better functioning of the photosystem II (PSII) under non-photoinhibitory conditions.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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C01	`01`		`ENG`	@0 High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental effects on plant growth. The aim of this study was to evaluate the use of reflective aluminized polypropylene shading nets on photosynthetic performance of citrus plants, by measuring CO₂ assimilation, transpiration rate, stomatal conductance and chlorophyll a fluorescence. Incident photosynthetically active radiation (PAR) levels and leaf temperatures were reduced when the reflective nets were used. Higher stomatal conductance and higher CO₂ assimilation rates were observed in shaded plants, so that integrated daily net CO₂ uptake was approximately 20% higher than in exposed plants. The better performance of shaded plants, however, was observed only during the middle of the day, being PAR-limited in early morning and late afternoon. The reflective net was also effective in preventing photoinhibition of photosynthesis in shaded plants, which sustained higher maximum (F_v/F_m) and effective (ΔF/F'_m) quantum yield with higher apparent electron transport rates (ETRs) than exposed plants. Observed photoinhibition in exposed plants was transient, probably reflecting photosynthetic regulatory responses to excess absorbed light energy. Therefore, the results clearly showed that photosynthetic performance of citrus cultivated in greenhouses can be improved by the use of reflective nets. Favorable effects comprised not only the maintenance of proper stomatal aperture for gas exchange but also a better functioning of the photosystem II (PSII) under non-photoinhibitory conditions.
C02	`01`	`X`		`@0 002A32C06B`
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C03	`04`	`X`	`SPA`	`@0 Red @5 04`
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C03	`06`	`X`	`ENG`	`@0 Reflecting surface @5 06`
C03	`06`	`X`	`SPA`	`@0 Superficie reflexiva @5 06`
C03	`07`	`X`	`FRE`	`@0 Conductance stomatique @5 07`
C03	`07`	`X`	`ENG`	`@0 Stomatal conductance @5 07`
C03	`07`	`X`	`SPA`	`@0 Conductancia estomática @5 07`
C03	`08`	`X`	`FRE`	`@0 Rayonnement photosynthétiquement actif @5 08`
C03	`08`	`X`	`ENG`	`@0 Photosynthetically active radiation @5 08`
C03	`08`	`X`	`SPA`	`@0 Radiación fotosinteticamente activa @5 08`
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C03	`15`	`X`	`FRE`	`@0 Brésil @2 NG @5 20`
C03	`15`	`X`	`ENG`	`@0 Brazil @2 NG @5 20`
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C07	`01`	`X`	`FRE`	`@0 Rutaceae @2 NS`
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Format Inist (serveur)

NO :	PASCAL 03-0187827 INIST
ET :	Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets
AU :	MEDINA (Camilo L.); SOUZA (Rogéria P.); MACHADO (Eduardo C.); RIBEIRO (Rafael V.); SILVA (José A. B.)
AF :	Departamento de Fisiologia Vegetal, Universidade Estadual de Campinas, CP 6109/13083-970 Campinas/Brésil (1 aut., 5 aut.); Centro de Ecofisiologia e Biofísica, Instituto Agronômico de Campinas, CP 28/13001-970 Campinas, SP/Brésil (2 aut., 3 aut.); Escola Superior de Agricultures Luiz de Queiroz, CP 9/13400-000 Piracicaba, SP/Brésil (4 aut.)
DT :	Publication en série; Niveau analytique
SO :	Scientia horticulturae; ISSN 0304-4238; Coden SHRTAH; Pays-Bas; Da. 2002; Vol. 96; No. 1-4; Pp. 115-125; Bibl. 1 p.1/2
LA :	Anglais
EA :	High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental effects on plant growth. The aim of this study was to evaluate the use of reflective aluminized polypropylene shading nets on photosynthetic performance of citrus plants, by measuring CO₂ assimilation, transpiration rate, stomatal conductance and chlorophyll a fluorescence. Incident photosynthetically active radiation (PAR) levels and leaf temperatures were reduced when the reflective nets were used. Higher stomatal conductance and higher CO₂ assimilation rates were observed in shaded plants, so that integrated daily net CO₂ uptake was approximately 20% higher than in exposed plants. The better performance of shaded plants, however, was observed only during the middle of the day, being PAR-limited in early morning and late afternoon. The reflective net was also effective in preventing photoinhibition of photosynthesis in shaded plants, which sustained higher maximum (F_v/F_m) and effective (ΔF/F'_m) quantum yield with higher apparent electron transport rates (ETRs) than exposed plants. Observed photoinhibition in exposed plants was transient, probably reflecting photosynthetic regulatory responses to excess absorbed light energy. Therefore, the results clearly showed that photosynthetic performance of citrus cultivated in greenhouses can be improved by the use of reflective nets. Favorable effects comprised not only the maintenance of proper stomatal aperture for gas exchange but also a better functioning of the photosystem II (PSII) under non-photoinhibitory conditions.
CC :	002A32C06B
FD :	Photosynthèse; Culture protégée; Ombrage(environnement); Filet; Aluminisation; Surface réfléchissante; Conductance stomatique; Rayonnement photosynthétiquement actif; Photoinhibition; Citrus sinensis; Transpiration; Propène polymère; Chlorophylle a; Assimilation nette; Brésil; Serre
FG :	Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Amérique du Sud; Amérique; Echange gazeux; Arboriculture; Agrume; Arbre fruitier
ED :	Photosynthesis; Protected cultivation; Shading; Net; Aluminizing; Reflecting surface; Stomatal conductance; Photosynthetically active radiation; Photoinhibition; Citrus sinensis; Transpiration; Propylene polymer; Chlorophyll a; Net assimilation rate; Brazil; Greenhouse
EG :	Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; South America; America; Gas exchange; Arboriculture; Citrus fruit; Fruit tree
SD :	Fotosíntesis; Cultivo protegido(invernadero); Sombrajo; Red; Aluminizacion; Superficie reflexiva; Conductancia estomática; Radiación fotosinteticamente activa; Fotoinhibición; Citrus sinensis; Transpiración; Propeno polímero; Clorofila a; Asimilación neta; Brasil; Invernadero
LO :	INIST-16233.354000106763520100
ID :	03-0187827

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Pascal:03-0187827

Le document en format XML

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<term>Net assimilation rate</term>
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<term>Propylene polymer</term>
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<front><div type="abstract" xml:lang="en">High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental effects on plant growth. The aim of this study was to evaluate the use of reflective aluminized polypropylene shading nets on photosynthetic performance of citrus plants, by measuring CO<sub>2</sub>
 assimilation, transpiration rate, stomatal conductance and chlorophyll a fluorescence. Incident photosynthetically active radiation (PAR) levels and leaf temperatures were reduced when the reflective nets were used. Higher stomatal conductance and higher CO<sub>2</sub>
 assimilation rates were observed in shaded plants, so that integrated daily net CO<sub>2</sub>
 uptake was approximately 20% higher than in exposed plants. The better performance of shaded plants, however, was observed only during the middle of the day, being PAR-limited in early morning and late afternoon. The reflective net was also effective in preventing photoinhibition of photosynthesis in shaded plants, which sustained higher maximum (F<sub>v</sub>
/F<sub>m</sub>
) and effective (ΔF/F'<sub>m</sub>
) quantum yield with higher apparent electron transport rates (ETRs) than exposed plants. Observed photoinhibition in exposed plants was transient, probably reflecting photosynthetic regulatory responses to excess absorbed light energy. Therefore, the results clearly showed that photosynthetic performance of citrus cultivated in greenhouses can be improved by the use of reflective nets. Favorable effects comprised not only the maintenance of proper stomatal aperture for gas exchange but also a better functioning of the photosystem II (PSII) under non-photoinhibitory conditions.</div>
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<fA03 i2="1"><s0>Sci. hortic.</s0>
</fA03>
<fA05><s2>96</s2>
</fA05>
<fA06><s2>1-4</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>MEDINA (Camilo L.)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>SOUZA (Rogéria P.)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>MACHADO (Eduardo C.)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>RIBEIRO (Rafael V.)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>SILVA (José A. B.)</s1>
</fA11>
<fA14 i1="01"><s1>Departamento de Fisiologia Vegetal, Universidade Estadual de Campinas, CP 6109</s1>
<s2>13083-970 Campinas</s2>
<s3>BRA</s3>
<sZ>1 aut.</sZ>
<sZ>5 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Centro de Ecofisiologia e Biofísica, Instituto Agronômico de Campinas, CP 28</s1>
<s2>13001-970 Campinas, SP</s2>
<s3>BRA</s3>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
</fA14>
<fA14 i1="03"><s1>Escola Superior de Agricultures Luiz de Queiroz, CP 9</s1>
<s2>13400-000 Piracicaba, SP</s2>
<s3>BRA</s3>
<sZ>4 aut.</sZ>
</fA14>
<fA20><s1>115-125</s1>
</fA20>
<fA21><s1>2002</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>16233</s2>
<s5>354000106763520100</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2003 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>1 p.1/2</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>03-0187827</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Scientia horticulturae</s0>
</fA64>
<fA66 i1="01"><s0>NLD</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental effects on plant growth. The aim of this study was to evaluate the use of reflective aluminized polypropylene shading nets on photosynthetic performance of citrus plants, by measuring CO<sub>2</sub>
 assimilation, transpiration rate, stomatal conductance and chlorophyll a fluorescence. Incident photosynthetically active radiation (PAR) levels and leaf temperatures were reduced when the reflective nets were used. Higher stomatal conductance and higher CO<sub>2</sub>
 assimilation rates were observed in shaded plants, so that integrated daily net CO<sub>2</sub>
 uptake was approximately 20% higher than in exposed plants. The better performance of shaded plants, however, was observed only during the middle of the day, being PAR-limited in early morning and late afternoon. The reflective net was also effective in preventing photoinhibition of photosynthesis in shaded plants, which sustained higher maximum (F<sub>v</sub>
/F<sub>m</sub>
) and effective (ΔF/F'<sub>m</sub>
) quantum yield with higher apparent electron transport rates (ETRs) than exposed plants. Observed photoinhibition in exposed plants was transient, probably reflecting photosynthetic regulatory responses to excess absorbed light energy. Therefore, the results clearly showed that photosynthetic performance of citrus cultivated in greenhouses can be improved by the use of reflective nets. Favorable effects comprised not only the maintenance of proper stomatal aperture for gas exchange but also a better functioning of the photosystem II (PSII) under non-photoinhibitory conditions.</s0>
</fC01>
<fC02 i1="01" i2="X"><s0>002A32C06B</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Photosynthèse</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Photosynthesis</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Fotosíntesis</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Culture protégée</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Protected cultivation</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Cultivo protegido(invernadero)</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Ombrage(environnement)</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Shading</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Sombrajo</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Filet</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Net</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Red</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Aluminisation</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Aluminizing</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Aluminizacion</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Surface réfléchissante</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Reflecting surface</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Superficie reflexiva</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Conductance stomatique</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Stomatal conductance</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Conductancia estomática</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Rayonnement photosynthétiquement actif</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Photosynthetically active radiation</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Radiación fotosinteticamente activa</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Photoinhibition</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Photoinhibition</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Fotoinhibición</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Transpiration</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Transpiration</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Transpiración</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Propène polymère</s0>
<s2>NK</s2>
<s5>15</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Propylene polymer</s0>
<s2>NK</s2>
<s5>15</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Propeno polímero</s0>
<s2>NK</s2>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Chlorophylle a</s0>
<s5>16</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Chlorophyll a</s0>
<s5>16</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Clorofila a</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Assimilation nette</s0>
<s5>17</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Net assimilation rate</s0>
<s5>17</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Asimilación neta</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Brésil</s0>
<s2>NG</s2>
<s5>20</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Brazil</s0>
<s2>NG</s2>
<s5>20</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Brasil</s0>
<s2>NG</s2>
<s5>20</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Serre</s0>
<s5>21</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG"><s0>Greenhouse</s0>
<s5>21</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA"><s0>Invernadero</s0>
<s5>21</s5>
</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>Amérique du Sud</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="05" i2="X" l="ENG"><s0>South America</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="05" i2="X" l="SPA"><s0>America del sur</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="06" i2="X" l="FRE"><s0>Amérique</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="06" i2="X" l="ENG"><s0>America</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="06" i2="X" l="SPA"><s0>America</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="07" i2="X" l="FRE"><s0>Echange gazeux</s0>
<s5>33</s5>
</fC07>
<fC07 i1="07" i2="X" l="ENG"><s0>Gas exchange</s0>
<s5>33</s5>
</fC07>
<fC07 i1="07" i2="X" l="SPA"><s0>Intercambio gaseoso</s0>
<s5>33</s5>
</fC07>
<fC07 i1="08" i2="X" l="FRE"><s0>Arboriculture</s0>
<s5>34</s5>
</fC07>
<fC07 i1="08" i2="X" l="ENG"><s0>Arboriculture</s0>
<s5>34</s5>
</fC07>
<fC07 i1="08" i2="X" l="SPA"><s0>Arboricultura</s0>
<s5>34</s5>
</fC07>
<fC07 i1="09" i2="X" l="FRE"><s0>Agrume</s0>
<s5>39</s5>
</fC07>
<fC07 i1="09" i2="X" l="ENG"><s0>Citrus fruit</s0>
<s5>39</s5>
</fC07>
<fC07 i1="09" i2="X" l="SPA"><s0>Agrios</s0>
<s5>39</s5>
</fC07>
<fC07 i1="10" i2="X" l="FRE"><s0>Arbre fruitier</s0>
<s5>40</s5>
</fC07>
<fC07 i1="10" i2="X" l="ENG"><s0>Fruit tree</s0>
<s5>40</s5>
</fC07>
<fC07 i1="10" i2="X" l="SPA"><s0>Arbol frutal</s0>
<s5>40</s5>
</fC07>
<fN21><s1>111</s1>
</fN21>
<fN82><s1>PSI</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 03-0187827 INIST</NO>
<ET>Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets</ET>
<AU>MEDINA (Camilo L.); SOUZA (Rogéria P.); MACHADO (Eduardo C.); RIBEIRO (Rafael V.); SILVA (José A. B.)</AU>
<AF>Departamento de Fisiologia Vegetal, Universidade Estadual de Campinas, CP 6109/13083-970 Campinas/Brésil (1 aut., 5 aut.); Centro de Ecofisiologia e Biofísica, Instituto Agronômico de Campinas, CP 28/13001-970 Campinas, SP/Brésil (2 aut., 3 aut.); Escola Superior de Agricultures Luiz de Queiroz, CP 9/13400-000 Piracicaba, SP/Brésil (4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Scientia horticulturae; ISSN 0304-4238; Coden SHRTAH; Pays-Bas; Da. 2002; Vol. 96; No. 1-4; Pp. 115-125; Bibl. 1 p.1/2</SO>
<LA>Anglais</LA>
<EA>High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental effects on plant growth. The aim of this study was to evaluate the use of reflective aluminized polypropylene shading nets on photosynthetic performance of citrus plants, by measuring CO<sub>2</sub>
 assimilation, transpiration rate, stomatal conductance and chlorophyll a fluorescence. Incident photosynthetically active radiation (PAR) levels and leaf temperatures were reduced when the reflective nets were used. Higher stomatal conductance and higher CO<sub>2</sub>
 assimilation rates were observed in shaded plants, so that integrated daily net CO<sub>2</sub>
 uptake was approximately 20% higher than in exposed plants. The better performance of shaded plants, however, was observed only during the middle of the day, being PAR-limited in early morning and late afternoon. The reflective net was also effective in preventing photoinhibition of photosynthesis in shaded plants, which sustained higher maximum (F<sub>v</sub>
/F<sub>m</sub>
) and effective (ΔF/F'<sub>m</sub>
) quantum yield with higher apparent electron transport rates (ETRs) than exposed plants. Observed photoinhibition in exposed plants was transient, probably reflecting photosynthetic regulatory responses to excess absorbed light energy. Therefore, the results clearly showed that photosynthetic performance of citrus cultivated in greenhouses can be improved by the use of reflective nets. Favorable effects comprised not only the maintenance of proper stomatal aperture for gas exchange but also a better functioning of the photosystem II (PSII) under non-photoinhibitory conditions.</EA>
<CC>002A32C06B</CC>
<FD>Photosynthèse; Culture protégée; Ombrage(environnement); Filet; Aluminisation; Surface réfléchissante; Conductance stomatique; Rayonnement photosynthétiquement actif; Photoinhibition; Citrus sinensis; Transpiration; Propène polymère; Chlorophylle a; Assimilation nette; Brésil; Serre</FD>
<FG>Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; Amérique du Sud; Amérique; Echange gazeux; Arboriculture; Agrume; Arbre fruitier</FG>
<ED>Photosynthesis; Protected cultivation; Shading; Net; Aluminizing; Reflecting surface; Stomatal conductance; Photosynthetically active radiation; Photoinhibition; Citrus sinensis; Transpiration; Propylene polymer; Chlorophyll a; Net assimilation rate; Brazil; Greenhouse</ED>
<EG>Rutaceae; Dicotyledones; Angiospermae; Spermatophyta; South America; America; Gas exchange; Arboriculture; Citrus fruit; Fruit tree</EG>
<SD>Fotosíntesis; Cultivo protegido(invernadero); Sombrajo; Red; Aluminizacion; Superficie reflexiva; Conductancia estomática; Radiación fotosinteticamente activa; Fotoinhibición; Citrus sinensis; Transpiración; Propeno polímero; Clorofila a; Asimilación neta; Brasil; Invernadero</SD>
<LO>INIST-16233.354000106763520100</LO>
<ID>03-0187827</ID>
</server>
</inist>
</record>

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Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets

Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets

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