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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
18/10/1995 |
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Data da última atualização: |
18/10/1995 |
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Autoria: |
KRIEDEMANN, P. E. |
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Afiliação: |
Division of Horticultural Research, CSIRO, Merbein, Vic. 3505. |
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Título: |
Some photosynthetic characteristics of citrus leaves. |
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Ano de publicação: |
1968 |
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Fonte/Imprenta: |
Aust. J. Biol. Sci., v.21, p.895-905, 1968. |
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Idioma: |
Inglês |
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Conteúdo: |
Photosynthesis and respiration were measured in the laboratory with an infrared gas analyser using attached leaves of well-estabished orange and lemon trees growing in pots. Under optimum conditions the photosvnthetic activity of mature leaves reached 10-12 mg CO2/hr/dm2. At the saturating light intensity of 2500 f.c. photosynthesis was linear with respect to CO2 concentration up to 300 p.p.m., with an intersction point on the abscissa between 20 and 30 p.p.m. CO2. The minimum intercellular CO2 concentration (T) was found tobe of the same order. The effect of temperature on net photosynthesis was mensured on well-watered oplants at a saturating light intensity and normal atmospheric CO2 concentration. However, in air with a relative humidity > 80% the sharp opimum was eliminated and net photosynthesis emained unchanged up to 30 grau C with little reduction at 35 grau C. Cyclic oscillations in photosynthesis and transpiration occurred when the leaf was exposed to a desiccating environment. this phenomenon is discussed in relation to stomatal control of gas exchange and the mesophyll resistance of the leaf. |
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Palavras-Chave: |
Citros; Citrus limonum; Citrus spp; Cultivares valencia. |
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Thesagro: |
Citrus Sinensis; Limão. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01620naa a2200193 a 4500
001 1647439
005 1995-10-18
008 1968 bl --- 0-- u #d
100 1 $aKRIEDEMANN, P. E.
245 $aSome photosynthetic characteristics of citrus leaves.
260 $c1968
520 $aPhotosynthesis and respiration were measured in the laboratory with an infrared gas analyser using attached leaves of well-estabished orange and lemon trees growing in pots. Under optimum conditions the photosvnthetic activity of mature leaves reached 10-12 mg CO2/hr/dm2. At the saturating light intensity of 2500 f.c. photosynthesis was linear with respect to CO2 concentration up to 300 p.p.m., with an intersction point on the abscissa between 20 and 30 p.p.m. CO2. The minimum intercellular CO2 concentration (T) was found tobe of the same order. The effect of temperature on net photosynthesis was mensured on well-watered oplants at a saturating light intensity and normal atmospheric CO2 concentration. However, in air with a relative humidity > 80% the sharp opimum was eliminated and net photosynthesis emained unchanged up to 30 grau C with little reduction at 35 grau C. Cyclic oscillations in photosynthesis and transpiration occurred when the leaf was exposed to a desiccating environment. this phenomenon is discussed in relation to stomatal control of gas exchange and the mesophyll resistance of the leaf.
650 $aCitrus Sinensis
650 $aLimão
653 $aCitros
653 $aCitrus limonum
653 $aCitrus spp
653 $aCultivares valencia
773 $tAust. J. Biol. Sci.$gv.21, p.895-905, 1968.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
