Photosynthetic capacity and specific leaf mass in twenty woody species of Cerrado vegetation under field conditions

Prado, C. H. B. A.; Moraes, José Antonio Proença Vieira de

doi:10.1023/a:1022183423630

Cited by 129 publications

(45 citation statements)

References 12 publications

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“…Some studies carried out in Brasília showed a significant drop in soil water potential (Ψs) only during the months free from rainfall (usually between July and September) when Ψs values reached -1.5 MPa in layers above 0.85 m (Franco et al, 1996;Franco, 1998;Franco, 2002). The atmosphere CO 2 concentration and air temperature mean values were similar between seasons (table 2), and averages of PPFD values were same or higher than that necessary to saturate net photosynthesis of 20 woody stricto sensu cerrado species studied by Prado and Moraes (1997). Atmosphere vapor pressure deficit (VPD) was 80% higher in the dry season (1.8 kPa) compared to that in the wet season (1.0 kPa), potentially increasing the transpiration under winter drought.…”

Section: Resultsmentioning

confidence: 84%

Seasonal leaf gas exchange and water potential in a woody cerrado species community

Prado

Zhang

Rojas

et al. 2004

Braz. J. Plant Physiol.

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Predawn leaf water potential (psipd) and morning values of leaf gas exchange, as net photosynthesis (A), stomatal conductance (gs), transpiration (E), and morning leaf water potential (psimn) were determined seasonally in 22 woody cerrado species growing under natural conditions. Despite the lower mean values of psipd in the dry season (-0.35 ± 0.23 MPa) compared to the wet season (-0.08 ± 0.03 MPa), the lowest psipd in the dry season (-0.90 ± 0.00 MPa) still showed a good nocturnal leaf water status recovery for all species studied through out the year. Mean gs values dropped 78 % in the dry season, when the vapor pressure of the air was 80% greater than in the wet season. This reduction in gs led to an average reduction of 33% in both A and E, enabling the maintainance of water use efficiency (WUE) during the dry season. Network connectance analysis detected a change in the relationship between leaf gas exchange and psimn in the dry season, mainly between gs-E and E-WUE. A slight global connectance value increase (7.25 %) suggested there was no severe water stress during the dry season. Multivariate analysis showed no link between seasonal response and species deciduousness, suggesting similar behavior in remaining leaves for most of the studied species concerning leaf gas exchange and psimn under natural drought.

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Section: Resultsmentioning

confidence: 84%

Seasonal leaf gas exchange and water potential in a woody cerrado species community

Prado

Zhang

Rojas

et al. 2004

Braz. J. Plant Physiol.

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“…The A-PPFD curves were estimated using the following PPFD values: 0, 25, 50, 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 and 2000 mol photons m -2 s -1 for each gas exchange measurement with an IRGA. The A-PPFD curves were adjusted according to PRADO & MORAES (1997). We calculated several parameters from the curve adjustment: Apparent Quantum Efficiency (AQE), Light saturation Point (Psat), Light compensation Point (Pcom), Dark respiration (Rd), and the Maximum CO2 Assimilation (Amax).…”

Section: Methodsmentioning

confidence: 99%

Tolerance to water deficiency between two soybean cultivars: transgenic versus conventional

et al. 2011

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“…Data was tested for normality of the distribution of residues, variance homogeneity and submitted to ANOVA followed by regression analysis at 5% error probability. For A as a function of PPFD, we used equation proposed by Prado and Moraes (1997) while other variables had their models adjusted by significant equations, based on the highest coefficient of determination. The apparent quantum efficiency and light compensation point was submitted by Tukey test at 5% error probability.…”

Section: Methodsmentioning

confidence: 99%

Photosynthetic responses of <i>Eucalyptus seedlings</i> submitted to chemical and mechanical stimulus

Lima¹,

Malavasi²,

Battistus³

et al. 2019

Ciênc. Florest.

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Este trabalho objetivou investigar as respostas fotossintéticas em mudas de híbrido 1528 de Eucalyptus urophylla x Eucalyptus grandis submetidas à aplicação de ácido jasmônico (JA) e ﬂexões caulinares. O experimento foi conduzido em casa de sombra utilizando delineamento inteiramente ao acaso com cinco repetições de 20 mudas, com os seguintes tratamentos: T1: controle, T2: 8,0 μmol de JA e T3: 40 ﬂexões caulinares. A taxa de assimilação líquida de CO2 (A), condutância estomática (gs), concentração interna de CO 2 (Ci), taxa de transpiração da folha (E), efciência do uso de água (WUE), efciência intrínseca do usode água (iWUE) e efciência de carboxilação (Fc) foram mensuradas com o auxílio do IRGA. A dose de JA aplicada nas mudas foi insufciente para alterar as respostas fotossintéticas em relação ao tratamentocontrole. Estímulos mecânicos induzidos através de ﬂexões caulinares em mudas do híbrido 1528 de eucalipto promoveram incremento da capacidade fotossintética máxima e máxima assimilação de CO2. Porém, as mudas apresentaram redução na efciência do uso da água, ou seja, menor efciência fotossintética quando comparado com as mudas submetidas aos demais tratamentos. Mudas do híbrido 1528 de eucalipto submetidas aos estímulos mecânico e ácido jasmônico apresentaram maior respiração sob níveis baixos de ﬂuxo de fótons fotossinteticamente ativos.

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Photosynthetic capacity and specific leaf mass in twenty woody species of Cerrado vegetation under field conditions

Cited by 129 publications

References 12 publications

Seasonal leaf gas exchange and water potential in a woody cerrado species community

Seasonal leaf gas exchange and water potential in a woody cerrado species community

Tolerance to water deficiency between two soybean cultivars: transgenic versus conventional

Photosynthetic responses of <i>Eucalyptus seedlings</i> submitted to chemical and mechanical stimulus

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