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  • 1
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    Online Resource
    Efeito da baixa temperatura noturna e do porta-enxerto na variação diurna das trocas gasosas e na atividade fotoquímica de laranjeira 'Valência'
    FapUNIFESP (SciELO) ; 2010
    In:  Revista Brasileira de Fruticultura Vol. 32, No. 2 ( 2010-06-18), p. 351-359
    Details
    In: Revista Brasileira de Fruticultura, FapUNIFESP (SciELO), Vol. 32, No. 2 ( 2010-06-18), p. 351-359
    Abstract: Decreases in photosynthesis during winter season are probably caused by low night temperature, even under non-limiting environmental conditions during the diurnal period. Citrus orchards are formed by grafted plants, being the 'Swingle' citrumelo rootstock recommended in areas with occurrence of low temperatures. However, the physiological mechanisms related to larger growth and crop yield in those plants are poorly understood. The aim of this study was to test the hypothesis that the effect of low night temperature in photosynthesis of sweet orange plants is dependent on the rootstock species, with 'Swingle' citrumelo (Citrus paradise x Poncirus trifoliata) inducing higher tolerance to overnight chilling when compared to 'Rangpur' lime (Citrus limonia) rootstock. Six-month old 'Valência' (Citrus sinensis) sweet orange plants grown in plastic bags (5 L) were exposed overnight (12 h) to temperatures of 20 and 8 ºC. The thermal treatment was carried out inside a growth chamber where only the upper plant shoots were exposed to temperature variation. Measurements of diurnal courses of leaf gas exchange and photochemical activity were taken under natural environmental conditions. Chilling night caused larger reduction on CO2 assimilation, stomatal conductance and transpiration in plants grafted on 'Rangpur' lime when compared to those onto 'Swingle' citrumelo rootstock. After the chilling treatment, maximum (Fv/Fm) and operational (Fq'/Fm') efficiencies of photosystem II decreased in plants grafted on 'Rangpur' lime, but remained practically undisturbed in plants grafted on 'Swingle' citrumelo rootstock. Therefore, the 'Swingle' citrumelo rootstock increased the photosynthetic efficiency of 'Valência' sweet orange plants exposed to overnight chilling when compared to the 'Rangpur' lime. The reduction of CO2 assimilation in chilled plants was due to low stomatal conductance and low apparent carboxylation efficiency, i.e., it is a consequence of both diffusive and metabolic limitations. Although Fv/Fm and Fq'/Fm' in plants grafted on 'Rangpur' lime have been more affected by chilling in relation to plants on 'Swingle' citrumelo rootstock, those effects were not related with decreases in CO2 assimilation. Chilling night also increased the alternative electron sinks, as shown by the increasing ratio between apparent electron transport rate and CO2 assimilation and reduced apparent carboxylation efficiency of plants grafted on 'Rangpur' lime with larger intensity than in plants onto 'Swingle' citrumelo rootstock. Those results confirm the hypothesis that low night temperature affects photosynthesis of 'Valência' sweet orange plants, being the chilling effects rootstock-dependent.
    Type of Medium: Online Resource
    ISSN: 1806-9967 , 0100-2945
    URL: Article
    DOI: 10.1590/S0100-29452010005000064
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2010
    detail.hit.zdb_id: 2105182-3
    SSG: 7,36
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  • 2
    Online Resource
    Online Resource
    Respostas biométricas e fisiológicas ao deficit hídrico em cana-de-açúcar em diferentes fases fenológicas
    FapUNIFESP (SciELO) ; 2009
    In:  Pesquisa Agropecuária Brasileira Vol. 44, No. 12 ( 2009-12), p. 1575-1582
    Details
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 44, No. 12 ( 2009-12), p. 1575-1582
    Abstract: The aim of this work was to evaluate the biometric and physiological responses of sugarcane (Saccharum spp.) to water deficit (WD), during different phenological phases. Genotypes IACSP 94-2094 and IACSP 96-2042 were subjected to WD conditions during the initial, maximum and sucrose accumulation phases. The experiment was carried out in a completely randomized design. Susceptibility to WD was established by reduction in stalk dry matter and soluble solids. Water deficit reduced leaf gas exchange in all phenological phases of both genotypes. Lower plant height, less stalk dry matter and soluble solids, and reduction in number and length of internodes were only observed during the initial growth phase of the IACSP 96-2042 clone. In the initial growth phase, tolerance to WD was observed for IACSP 94-2094, with evidence of physiological acclimation, and for IACSP 96-2042 in reduction phytomass production and its soluble solid content, caused by lower stomatal conductance and lower apparent carboxylation efficiency which limit photosynthesis. Regardless of the phenological phase, genotype IACSP 94-2094 was tolerant to WD, since its phytomass production was maintained even with impairment of leaf gas exchange.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    URL: Article
    DOI: 10.1590/S0100-204X2009001200003
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2009
    detail.hit.zdb_id: 2053197-7
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  • 3
    Online Resource
    Online Resource
    Baixa temperatura noturna e deficiência hídrica na fotossíntese de cana‑de‑açúcar
    FapUNIFESP (SciELO) ; 2013
    In:  Pesquisa Agropecuária Brasileira Vol. 48, No. 5 ( 2013-05), p. 487-495
    Details
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 48, No. 5 ( 2013-05), p. 487-495
    Abstract: The objective of this work was to evaluate the photosynthetic responses of sugarcane to the simultaneous and isolated effects of low night temperature (TN) and water deficit (DH). After 128 days of planting, plants of the cultivar IACSP94-2094 were subjected to the following treatments: control, without DH and with TN of 20°C (TN20); with DH and TN of 20°C (DH/TN20); without DH and with TN of 12°C (TN12); and with DH and TN of 12°C (DH/TN12). After the period of treatment, plants were irrigated and subjected to TN of 20°C for four more days, for recovery. There were decreases in CO2 assimilation in all treatments. Total recovery of CO2 assimilation was observed only in plants from the treatment TN12. The simultaneous occurrence of low night temperature and water deficit caused a accentuated and persistent effect on stomatal conductance, on the maximum capacity of ribulose‑1,5‑bisphosphate carboxylase, on the electron transport rate, on the efficiency factor, and on the operational efficiency of photosystem II, which resulted in diffusive, biochemical, and photochemical limitations of photosynthesis of sugarcane plants.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    URL: Article
    DOI: 10.1590/S0100-204X2013000500004
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2013
    detail.hit.zdb_id: 2053197-7
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  • 4
    Online Resource
    Online Resource
    Florescimento e frutificação em laranjeiras 'valência' com diferentes cargas de frutos e submetidas ou não à irrigação
    FapUNIFESP (SciELO) ; 2007
    In:  Bragantia Vol. 66, No. 2 ( 2007), p. 173-182
    Details
    In: Bragantia, FapUNIFESP (SciELO), Vol. 66, No. 2 ( 2007), p. 173-182
    Abstract: The objective of the present study was to evaluate how the crop fruit load status in orange tree 'Valência' throughout a year affects the carbohydrate content in leaves, the vegetative growth, the flowering, the fruit set, and the yield in the following season, in plants with and without irrigation. The experiment was conduced in two steps in field condition. In the first step (February, 2004) a half of both, irrigated and non irrigated plants, had all the fruits removed. The experimental design was a 2 x 2 factorial with six repetitions. The results were subjected to analyses of variance and means were compared by the Tukey test at 5%. The presence of fruits affected the vegetative growth and the flowering intensity. In second step, the same oranges trees that have been defruited presented higher yield. These plants showed a less intense flowering, indicating that flowering was partially inhibited by the fruits. Our results did not show any evidence that the carbohydrates content could have limited flowering intensity due to a competition with the fruits for carbohydrates. The low winter air temperatures were suitable to induce flowering in the irrigated orange trees. However flowering was more intense in case of water deficit in non irrigated plants during the induction crop phase. The number of bearing fruits and the initial growth of fruits are limited by the availability of carbohydrates.
    Type of Medium: Online Resource
    ISSN: 0006-8705
    URL: Article
    DOI: 10.1590/S0006-87052007000200001
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2007
    detail.hit.zdb_id: 2016147-5
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  • 5
    Online Resource
    Online Resource
    Trocas gasosas e balanço de carboidratos em plantas de cana-de-açúcar sob condições de estresses radiculares
    FapUNIFESP (SciELO) ; 2012
    In:  Bragantia Vol. 71, No. 3 ( 2012), p. 319-327
    Details
    In: Bragantia, FapUNIFESP (SciELO), Vol. 71, No. 3 ( 2012), p. 319-327
    Abstract: Although the photosynthetic responses of sugarcane plants to environmental stresses are well documented, the biomass accumulation and the dynamic of carbohydrate reserves under simultaneous exposure of roots to low temperature and drought are not known. This work aims to investigate the effect of water deficit and low substrate temperature stresses, occurring alone or in combination, on the sugarcane IACSP94-2094, a drought-tolerant genotype. As our hypothesis, we assume that this genotype is also tolerant to low substrate temperature, since low temperatures and water deficit occur simultaneously under field conditions. The water deficit alone or in combination with low substrate temperature caused reductions in leaf water potential and CO2 assimilation, which was not observed in plants subjected only to low substrate temperature. The leaf concentration of non-structural carbohydrates, sucrose and starch increased in plants under root chilling. In plants subjected to water deficit, we noticed decreases in leaf starch concentration. The root stresses caused an increase in the total soluble sugar concentration and reduction in starch concentration in sugarcane roots. As the plant biomass accumulation was not affected, even with the impairment of root growth under low substrate temperature, we conclude that the sugarcane genotype IACSP94-2094 presents evidence of tolerance to low root temperature. The maintenance of plant growth was likely associated with the breakdown of leaf and root reserves of starch.
    Type of Medium: Online Resource
    ISSN: 1678-4499 , 0006-8705
    URL: Article
    DOI: 10.1590/S0006-87052012000300001
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2012
    detail.hit.zdb_id: 2016147-5
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  • 6
    Online Resource
    Online Resource
    Moderate warm temperature improves shoot growth, affects carbohydrate status and stimulates photosynthesis of sweet orange plants
    FapUNIFESP (SciELO) ; 2012
    In:  Brazilian Journal of Plant Physiology Vol. 24, No. 1 ( 2012), p. 37-46
    Details
    In: Brazilian Journal of Plant Physiology, FapUNIFESP (SciELO), Vol. 24, No. 1 ( 2012), p. 37-46
    Type of Medium: Online Resource
    ISSN: 1677-0420
    URL: Article
    DOI: 10.1590/S1677-04202012000100006
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2012
    detail.hit.zdb_id: 2104587-2
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    Variação da temperatura do substrato e fotossíntese em mudas de laranjeira 'Valência'
    FapUNIFESP (SciELO) ; 2009
    In:  Pesquisa Agropecuária Brasileira Vol. 44, No. 9 ( 2009-09), p. 1118-1126
    Details
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 44, No. 9 ( 2009-09), p. 1118-1126
    Abstract: The aim of this work was to evaluate the influence of the substrate temperature on gas exchange, photochemical activity and water relations in 'Valencia' sweet orange grafted onto 'Rangpur' lime. Six-month-old nursery trees were used. The experiment was carried out in a growth chamber, where the root system was maintained at 10, 20 (control) or 30ºC, the air temperature varied between 25 and 20ºC from day to night, the photoperiod and photosynthetic photon flux density were set to 12 hours and 800 µmol m-2 s-1, respectively. The CO2 assimilation rates in response to the intercellular CO2, chlorophyll a fluorescence and leaf water potential at 6 h and 13 h were measured for each treatment. The higher root temperature increased the CO2 assimilation in relation to the control temperature, due to diffusive and metabolic factors: plants showed enhanced maximum carboxylation efficiency (Vc, max), ribulose-1,5-bisphosphate regeneration (Jmax), and both stomatal (gs) and mesophyll (gi) conductances. The lowest root temperature led to increased alternative electron sink and decreased CO2 assimilation, due to diffusive and metabolic limitations, indicated by decreases in gs, gi, Vc, max, and Jmax.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    URL: Article
    DOI: 10.1590/S0100-204X2009000900008
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2009
    detail.hit.zdb_id: 2053197-7
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  • 8
    Online Resource
    Online Resource
    Deficiência hídrica, trocas gasosas e crescimento de raízes em laranjeira ‘Valência’ sobre dois tipos de porta-enxertos
    FapUNIFESP (SciELO) ; 2008
    In:  Bragantia Vol. 67, No. 1 ( 2008), p. 75-82
    Details
    In: Bragantia, FapUNIFESP (SciELO), Vol. 67, No. 1 ( 2008), p. 75-82
    Abstract: The growth and distribution of the root system affect the response of the plants to water deficit. This work aim at the to evaluation of 'Valencia' orange budded on 'Rangpur 〈 FONT FACE=Symbol 〉 ¢ 〈 /FONT 〉 lime and Poncirus trifoliata ('Trifoliata') as to root growth, gas exchange (CO2 and H2O), leaf water potential and distribution of carbohydrates in several organs, in plants submitted to water deficit. Plants were transplanted to 32 rizotrons, which allowed root visualization of the roots. Sixteen plants in each rootstock were submitted to irrigation and the other 16 remained without irrigation. Water deficit was induced withholding the water supply. Stomatal conductance declined after the fourth day without irrigation, causing a reduction of the photosynthesis, the transpiration and the carboxilation efficiency. The total carbohydrate content (sucrose + reducing sugars + starch) in plants without water stress was greater in 'Trifoliata', and among the water deficit treatments it was always less. The dry phytomass of the plants without water deficit was greater in both rootstocks. Among the irrigated and non irrigated treatments, the length of the roots same of rootstocks was similar. However, the root lengths of plants on 'Rangpur' lime were significantly greater than that on 'Trifoliata'. Even under water deficit and great decrease of the photosynthetic production, the roots maintained growth, possibly at the expenses of mobilized substrates of other plant parts.
    Type of Medium: Online Resource
    ISSN: 0006-8705
    URL: Article
    DOI: 10.1590/S0006-87052008000100009
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2008
    detail.hit.zdb_id: 2016147-5
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  • 9
    Online Resource
    Online Resource
    Rootstocks induce contrasting photosynthetic responses of orange plants to low night temperature without affecting the antioxidant metabolism
    FapUNIFESP (SciELO) ; 2013
    In:  Theoretical and Experimental Plant Physiology Vol. 25, No. 1 ( 2013), p. 26-35
    Details
    In: Theoretical and Experimental Plant Physiology, FapUNIFESP (SciELO), Vol. 25, No. 1 ( 2013), p. 26-35
    Type of Medium: Online Resource
    ISSN: 2197-0025
    URL: Article
    DOI: 10.1590/S2197-00252013000100004
    Language: English
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2013
    detail.hit.zdb_id: 2776145-9
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