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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
Fecha : |
21/02/2014 |
Actualizado : |
08/10/2019 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Autor : |
SYVERTSEN, J.P.; GOÑI, C.; OTERO, A. |
Afiliación : |
J. P. SYVERTSEN, University of Florida, United States; CARMEN TERESITA GOÑI ALTUNA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ALVARO RICARDO OTERO CAMA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
Título : |
Fruit load and canopy shading affect leaf characteristics and net gas exchange of 'Spring' navel orange trees. |
Fecha de publicación : |
2003 |
Fuente / Imprenta : |
Tree Physiology, September 2003, Volume 23, Issue 13, Pages 899-906. OPEN ACCESS. |
ISSN : |
0829-318X |
DOI : |
10.1093/treephys/23.13.899 |
Idioma : |
Inglés |
Notas : |
Article history: Received December 11, 2002 / Accepted March 8, 2003 / Published online August 1, 2003. |
Contenido : |
ABSTRACT.
Five-year-old 'Spring' navel (Citrus sinensis (L.) Osbeck) orange trees were completely defruited, 50% defruited or left fully laden to study effects of fruit load on concentrations of nitrogen (N) and carbohydrate, net assimilation of CO2 (Ac) and stomatal conductance (g s) of mature leaves on clear winter days just before fruit harvest. Leaves on defruited trees were larger, had higher starch concentrations and greater leaf dry mass per area (LDMa) than leaves on fruited trees. Both Ac and gs were more than 40% lower in sunlit leaves on defruited trees than in sunlit leaves on trees with fruit. Leaves immediately adjacent to fruit were smaller, had lower leaf nitrogen and carbohydrate concentrations, lower LDMa and lower Ac than leaves on non-fruiting branches of the same trees. Removing half the crop increased individual fruit mass, but reduced fruit color development. Half the trees were shaded with 50% shade cloth for 4 months before harvest to determine the effects of lower leaf temperature (T1) and leaf-to-air vapor pressure difference on leaf responses. On relatively warm days when sunlit T1 > 25°C, shade increased Ac and gs, but had no effect on the ratio of internal to ambient CO2 (C i/Ca) concentration in leaves, implying that high mesophyll temperatures in sunlit leaves were more important than gs in limiting Ac. Sunlit leaves were more photoinhibited than shaded leaves on cooler days when T1 < 25°C. Shade decreased total soluble sugar concentrations in leaves, but had no effect on leaf starch concentrations. Shading had no effects on canopy volume, yield or fruit size, but shaded fruit developed better external color than sun-exposed fruit. Overall, the presence of a normal fruit crop resulted in lower foliar carbohydrate concentrations and higher Ac compared with defruited trees, except on warm days when Ac was reduced by high leaf temperatures.
Copyright © 2003, Oxford University Press MenosABSTRACT.
Five-year-old 'Spring' navel (Citrus sinensis (L.) Osbeck) orange trees were completely defruited, 50% defruited or left fully laden to study effects of fruit load on concentrations of nitrogen (N) and carbohydrate, net assimilation of CO2 (Ac) and stomatal conductance (g s) of mature leaves on clear winter days just before fruit harvest. Leaves on defruited trees were larger, had higher starch concentrations and greater leaf dry mass per area (LDMa) than leaves on fruited trees. Both Ac and gs were more than 40% lower in sunlit leaves on defruited trees than in sunlit leaves on trees with fruit. Leaves immediately adjacent to fruit were smaller, had lower leaf nitrogen and carbohydrate concentrations, lower LDMa and lower Ac than leaves on non-fruiting branches of the same trees. Removing half the crop increased individual fruit mass, but reduced fruit color development. Half the trees were shaded with 50% shade cloth for 4 months before harvest to determine the effects of lower leaf temperature (T1) and leaf-to-air vapor pressure difference on leaf responses. On relatively warm days when sunlit T1 > 25°C, shade increased Ac and gs, but had no effect on the ratio of internal to ambient CO2 (C i/Ca) concentration in leaves, implying that high mesophyll temperatures in sunlit leaves were more important than gs in limiting Ac. Sunlit leaves were more photoinhibited than shaded leaves on cooler days when T1 < 25°C. Shade decreased total soluble sugar concentrations in... Presentar Todo |
Palabras claves : |
Carbohydrates; Chlorophyll fluorescence; Leaf CO2 assimilation; LVPD; Photoinhibition; Soluble sugars; Starch; Stomatal conductance. |
Asunto categoría : |
F01 Cultivo |
Marc : |
LEADER 02885naa a2200277 a 4500 001 1012763 005 2019-10-08 008 2003 bl uuuu u00u1 u #d 022 $a0829-318X 024 7 $a10.1093/treephys/23.13.899$2DOI 100 1 $aSYVERTSEN, J.P. 245 $aFruit load and canopy shading affect leaf characteristics and net gas exchange of 'Spring' navel orange trees.$h[electronic resource] 260 $c2003 500 $aArticle history: Received December 11, 2002 / Accepted March 8, 2003 / Published online August 1, 2003. 520 $aABSTRACT. Five-year-old 'Spring' navel (Citrus sinensis (L.) Osbeck) orange trees were completely defruited, 50% defruited or left fully laden to study effects of fruit load on concentrations of nitrogen (N) and carbohydrate, net assimilation of CO2 (Ac) and stomatal conductance (g s) of mature leaves on clear winter days just before fruit harvest. Leaves on defruited trees were larger, had higher starch concentrations and greater leaf dry mass per area (LDMa) than leaves on fruited trees. Both Ac and gs were more than 40% lower in sunlit leaves on defruited trees than in sunlit leaves on trees with fruit. Leaves immediately adjacent to fruit were smaller, had lower leaf nitrogen and carbohydrate concentrations, lower LDMa and lower Ac than leaves on non-fruiting branches of the same trees. Removing half the crop increased individual fruit mass, but reduced fruit color development. Half the trees were shaded with 50% shade cloth for 4 months before harvest to determine the effects of lower leaf temperature (T1) and leaf-to-air vapor pressure difference on leaf responses. On relatively warm days when sunlit T1 > 25°C, shade increased Ac and gs, but had no effect on the ratio of internal to ambient CO2 (C i/Ca) concentration in leaves, implying that high mesophyll temperatures in sunlit leaves were more important than gs in limiting Ac. Sunlit leaves were more photoinhibited than shaded leaves on cooler days when T1 < 25°C. Shade decreased total soluble sugar concentrations in leaves, but had no effect on leaf starch concentrations. Shading had no effects on canopy volume, yield or fruit size, but shaded fruit developed better external color than sun-exposed fruit. Overall, the presence of a normal fruit crop resulted in lower foliar carbohydrate concentrations and higher Ac compared with defruited trees, except on warm days when Ac was reduced by high leaf temperatures. Copyright © 2003, Oxford University Press 653 $aCarbohydrates 653 $aChlorophyll fluorescence 653 $aLeaf CO2 assimilation 653 $aLVPD 653 $aPhotoinhibition 653 $aSoluble sugars 653 $aStarch 653 $aStomatal conductance 700 1 $aGOÑI, C. 700 1 $aOTERO, A. 773 $tTree Physiology, September 2003, Volume 23, Issue 13, Pages 899-906. OPEN ACCESS.
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INIA Las Brujas (LB) |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas; INIA Tacuarembó. |
Fecha actual : |
21/02/2014 |
Actualizado : |
13/10/2015 |
Tipo de producción científica : |
Actividades de Difusión |
Autor : |
PÉREZ, J.A.; AGUERRE, V.; CARDOZO, O.; CAPRA, G. |
Afiliación : |
JUAN ANTONIO PÉREZ, Técnico Contratado. CNFR (Comisión Nacional de Fomento Rural); MARIA VERONICA AGUERRE ANTIA, Técnico Contratado. CNFR (Comisión Nacional de Fomento Rural); OSVALDO CARDOZO SARAVIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; GUSTAVO ENRIQUE CAPRA CASSINONI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
Título : |
Propuestas de producción de carne vacuna intensiva para predios de área reducida |
Fecha de publicación : |
2003 |
Fuente / Imprenta : |
Canelones (Uruguay): INIA, 2003. |
Páginas : |
24 p. |
Serie : |
(INIA Serie Actividades de Difusión ; 338) |
Idioma : |
Español |
Thesagro : |
BOVINOS PARA CARNE; CARNE; CRIANZA INTENSIVA; GANADERIA; PRODUCCION ANIMAL; PRODUCCION DE CARNE; PRODUCCION FAMILIAR; SISTEMAS DE EXPLOTACION. |
Asunto categoría : |
L01 Ganadería |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/355/1/111219210807174051.pdf
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Marc : |
LEADER 00747naa a2200265 a 4500 001 1003256 005 2015-10-13 008 2003 bl uuuu u00u1 u #d 100 1 $aPÉREZ, J.A. 245 $aPropuestas de producción de carne vacuna intensiva para predios de área reducida 260 $c2003 300 $a24 p. 490 $a(INIA Serie Actividades de Difusión ; 338) 650 $aBOVINOS PARA CARNE 650 $aCARNE 650 $aCRIANZA INTENSIVA 650 $aGANADERIA 650 $aPRODUCCION ANIMAL 650 $aPRODUCCION DE CARNE 650 $aPRODUCCION FAMILIAR 650 $aSISTEMAS DE EXPLOTACION 700 1 $aAGUERRE, V. 700 1 $aCARDOZO, O. 700 1 $aCAPRA, G. 773 $tCanelones (Uruguay): INIA, 2003.
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