Photosynthetic response of citrus grown under reflective aluminized polypropylene shading nets
Identifieur interne : 000774 ( PascalFrancis/Corpus ); précédent : 000773; suivant : 000775Photosynthetic 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. SilvaSource :
- Scientia horticulturae [ 0304-4238 ] ; 2002.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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 (Fv/Fm) 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.
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Format Inist (serveur)
NO : | PASCAL 03-0187827 INIST |
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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 (Fv/Fm) 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:03-0187827Le document en format XML
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<term>Net assimilation rate</term>
<term>Photoinhibition</term>
<term>Photosynthesis</term>
<term>Photosynthetically active radiation</term>
<term>Propylene polymer</term>
<term>Protected cultivation</term>
<term>Reflecting surface</term>
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<term>Stomatal conductance</term>
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<term>Conductance stomatique</term>
<term>Rayonnement photosynthétiquement actif</term>
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<term>Citrus sinensis</term>
<term>Transpiration</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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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>
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</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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