CARBON GAIN IN <i>COFFEA ARABICA</i> DURING CLEAR AND CLOUDY DAYS IN THE WET SEASON

Ronquim, Júlio Cesar; Prado, C. H. B. A.; Novaes, Paula; Fahl, Joel Irineu; Ronquim, C. C.

doi:10.1017/s0014479705003121

Cited by 17 publications

(17 citation statements)

References 24 publications

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“…In contrast, relatively higher A values were found in 2008, paralleling the higher g s and C i /C a values. To a large extent, the differences in the ı e for 2007 and 2008 should explain the magnitude of the gas exchanges, in addition to illustrating the strong stomatal sensitivity to the ı e of coffee (Barros et al, 1997;Silva et al, 2004;Ronquim et al, 2006;Franck and Vaast, 2009). The similarity reported here for the values of the A, g s and C i /C a ratio among the different LFRs is not consistent with the data of Vaast et al (2005), Franck et al (2006 or DaMatta et al (2008).…”

Section: Lower Eastmentioning

confidence: 99%

Varying leaf-to-fruit ratios affect branch growth and dieback, with little to no effect on photosynthesis, carbohydrate or mineral pools, in different canopy positions of field-grown coffee trees

Chaves

Martins

Batista

et al. 2012

Environmental and Experimental Botany

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a b s t r a c tHeavy bearing is a typical phenomenon on unshaded coffee (Coffea arabica L.) trees and limits both the production and retention of leaves, leading to branch dieback, and, thus, results in a strong biennial bearing pattern. The major goals of this study were to investigate the physiological mechanisms that may be associated with the leaf-to-fruit ratio (LFR), branch dieback, biennial production and the relationships between carbohydrate and mineral fluctuations and branch dieback in coffee plants. The trees were grown in north-south-oriented hedgerows under conditions of full sunlight. Leaves and plagiotropic branches from the upper and lower strata of the east-and west-facing sides of the hedgerow were examined. A strong biennial pattern of coffee production was observed over three harvests. Overall, the east face of the hedgerow produced a more sellable crop than the west face, and this was associated with more light availability for the east-facing branches. The branch growth rate was higher with an increasing LFR during 2006-2007, regardless of the canopy position, and no compensatory increase in the photosynthetic rate was found in response to a decreasing LFR. Due to a relatively low fruit yield in 2007-2008, there was no branch dieback. The extent of branch dieback increased dramatically with decreasing LFR and was probably not closely related to changes in the concentrations of carbohydrates, amino acids and minerals. The extent of branch dieback was apparently unrelated to the differences in the photosynthetic rates per unit leaf area, carbon isotope composition, or oxidative stress, as was assessed by the electrolyte leakage from the leaf tissues. We discuss these responses in terms of the relative lack of branch autonomy in coffee trees.

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Section: Lower Eastmentioning

confidence: 99%

Varying leaf-to-fruit ratios affect branch growth and dieback, with little to no effect on photosynthesis, carbohydrate or mineral pools, in different canopy positions of field-grown coffee trees

Chaves

Martins

Batista

et al. 2012

Environmental and Experimental Botany

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“…Coffee plants are able to acclimate to high levels of irradiance by triggering photoprotection and antioxidant mechanisms and by reinforcing photosynthetic machinery components, as long as the plant has an adequate supply of nitrogen (Ramalho et al, 1998). However, it is often reported that high irradiance hampers photosynthesis in coffee leaves, with higher net photosynthesis observed on cloudy days (Ronquim et al, 2006). In fact, the average yield of 12 year old agroforestry systems, which also provide environmental mitigation, may be 43% greater than that of full-sun crops, compensating for the higher cost of establishing the agroforestry system (Souza et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Microclimate and development of 'Conilon' coffee intercropped with rubber trees

Partelli

Araújo

Vieira

et al. 2014

Pesq. agropec. bras.

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-The objective of this work was to evaluate the influence of intercropping 'Conilon' coffee (Coffea canephora) with rubber trees on coffee tree microclimate, nutrition, growth, and yield. Rubber trees were planted in two double rows 33 m apart, with 4x2.3 m spacing between plants. Treatments consisted of the distances from the coffee plants to the rubber trees: 3, 6, 9, 12, and 15 m. Measurements of atmospheric variables (temperature, irradiance, and relative humidity), leaf nutrient concentration, internode length of plagiotropic and orthotropic branches, individual leaf area, chlorophyll content, and yield were performed. Intercropping promotes changes in the microclimatic conditions of coffee plants close to rubber trees, with reduction of temperature and irradiance level and increase in air relative humidity. The proximity of the coffee tree to the rubber trees promotes the elongation of the plagiotropic and orthotropic branches and increases the individual leaf area; however, it does not affect leaf concentrations of N, K, Mg, Fe, Zn, and B in 'Conilon' coffee and does not have a negative impact on yield.Index terms: Coffea canephora, Hevea brasiliensis, irradiance, monoculture, shading. Microclima e desenvolvimento do café 'Conilon' consorciado com seringueiraResumo -O objetivo deste trabalho foi avaliar a influência do consórcio do cafeeiro 'Conilon' (Coffea canephora) com seringueira no microclima, na nutrição, no crescimento e na produtividade do cafeeiro. As seringueiras foram plantadas em duas fileiras duplas, distantes 33 m, no espaçamento de 4x2,3 m entre as plantas. Os tratamentos consistiram das distâncias dos cafeeiros em relação às seringueiras: 3, 6, 9, 12 e 15 m. Foram realizadas medidas das variáveis atmosféricas (temperatura, irradiância e humidade relativa), da concentração foliar dos nutrientes, do comprimento dos entrenós de ramos plagiotrópicos e ortotrópicos, da área foliar individual, da concentração de clorofila e da produtividade. O consórcio promove mudanças nas condições microclimáticas dos cafeeiros próximos da seringueira, tendo ocorrido diminuição da temperatura e da irradiância e aumento da umidade relativa do ar. A proximidade do cafeiro em relação às seringueiras promove alongamento dos ramos plagiotrópicos e ortotrópicos e aumenta a área foliar individual; porém, não afeta as concentrações foliares de N, K, Mg, Fe, Zn e B em café 'Conilon' e não tem impacto negativo na produtividade.

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“…Barros et al (1999) reported that the maximum rate of net photosynthesis in coffee was 4.5 mg CO 2 dm -2 h -1 and photosynthesis rate was decreased at the midday. This is associated to stomatal closure induced by direct action of sunlight, but not by leaf water relations (Franck et al, 2006;Ronquim et al, 2006); and also circumstantially with photoinhibition of photosynthesis and feedback inhibition coupled to an accumulation of soluble sugars in coffee leaves (Franck et al, 2006;Ronquim et al, 2006). Kanechi et al (1995) also observed that stomatal conductance decreases logarithmically with increasing leaf temperature and vapor pressure deficit.…”

Section: Effects Of Shade On Stomatal Conductance Of Coffeementioning

confidence: 99%

Impact of shade on morpho-physiological characteristics of coffee plants, their pests and diseases: A review

Ayalew¹

2018

Afr. J. Agric. Res.

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Traditionally, coffee plant has been considered as a shade demanding species and intolerant of direct sunlight, although it performs well without shade. Still controversy result and recommendation have been reported among investigators in the optimal shading level for coffee growth. This controversy will probably continue endlessly until the effects of shade up on the performance of morphology and physiology of the plant is known better. This review discusses the advantages of shade for coffee production, the responses of coffee plants to shade in morphology, physiology, and effects on coffee pest and diseases and finally, the effect of shade on coffee pest and diseases are discussed.

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CARBON GAIN IN COFFEA ARABICA DURING CLEAR AND CLOUDY DAYS IN THE WET SEASON

Cited by 17 publications

References 24 publications

Varying leaf-to-fruit ratios affect branch growth and dieback, with little to no effect on photosynthesis, carbohydrate or mineral pools, in different canopy positions of field-grown coffee trees

Varying leaf-to-fruit ratios affect branch growth and dieback, with little to no effect on photosynthesis, carbohydrate or mineral pools, in different canopy positions of field-grown coffee trees

Microclimate and development of 'Conilon' coffee intercropped with rubber trees

Impact of shade on morpho-physiological characteristics of coffee plants, their pests and diseases: A review

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