2011
DOI: 10.1007/s00468-011-0606-2
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Photosynthetic limitations in coffee plants are chiefly governed by diffusive factors

Abstract: It has long been held that the regulation of photosynthesis in source leaves may be controlled by carbohydrates. The mechanisms that govern the diurnal fluctuation of photosynthesis and the potential role of feedback regulation by carbohydrates during photosynthesis in coffee (Coffea arabica) leaves were investigated in three independent and complementary experiments. An integrative approach using gas exchange measurements in addition to carbon isotope labelling and steady-state carbohydrate and amino acid ana… Show more

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Cited by 43 publications
(35 citation statements)
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“…These decreases are often lower for woody than for herbaceous species (Ainsworth and Rogers 2007). The apparent unresponsiveness of coffee's stomata to elevated [CO 2 ] may have important consequences for the maximization of CO 2 entry into leaves, particularly because the g s values in coffee are quite small typically ranging from 10 to 50 mmol H 2 O m −2 s −1 from midday onwards (DaMatta et al 2008;Batista et al 2012;Figs. 1 and 2) as a consequence of rising vapor pressure deficit.…”
Section: Discussionmentioning
confidence: 98%
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“…These decreases are often lower for woody than for herbaceous species (Ainsworth and Rogers 2007). The apparent unresponsiveness of coffee's stomata to elevated [CO 2 ] may have important consequences for the maximization of CO 2 entry into leaves, particularly because the g s values in coffee are quite small typically ranging from 10 to 50 mmol H 2 O m −2 s −1 from midday onwards (DaMatta et al 2008;Batista et al 2012;Figs. 1 and 2) as a consequence of rising vapor pressure deficit.…”
Section: Discussionmentioning
confidence: 98%
“…Overall, trees and shrubs such as coffee usually have higher photosynthetic rates at high [CO 2 ] than annual crops (Ainsworth and Long 2005;Ainsworth and Rogers 2007) because of their larger sink capacity (root-trunk system). Under ambient [CO 2 ], coffee plant displays a well-known pattern of g s fluctuations, i.e., g s peaks in the early morning and decreases progressively throughout the day, reaching a minimum in the late afternoon (DaMatta et al 2008;Batista et al 2012); this pattern was unaltered by elevated [CO 2 ]. Although the g s values, integrated over the course of the day, could be decreased by elevated [CO 2 ] under winter conditions in Obatã, our daily averaged g s values were clearly unaffected by the treatments when gas exchange is at its maximum during the growing season (Silva et al 2004).…”
Section: Discussionmentioning
confidence: 99%
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“…In fact, Junqueira (2012) has reported higher sensitivity of mesophyll conductance of orange leaves to changes in growth temperature. The important role of the diffusive limitation of photosynthesis (considering stomata and mesophyll) was recently reported in coffee plants, another tree species largely cultivated under subtropical conditions (Batista et al, 2012).…”
Section: Discussionmentioning
confidence: 99%
“…Changes in photosynthetic capacity, rather than only assimilation rates, are more likely to be observed in association with high concentrations of carbohydrates (Urban and Alphonsout 2007). One hypothetical mechanism for this is that high concentrations of carbohydrates lead to source-sink imbalances (Iglesias et al 2002), which repress the expression of gene coding for several photosynthetic enzymes (Boriboonkaset et al 2013), and it is a carbohydrate-dependent mechanism that girdling decreases photosynthesis (Drake et al 1997;Urban and Alphonsout 2007;Batista et al 2012). However, the mechanisms whereby net photosynthetic rate (A net ) is decreased following carbohydrate accumulation are not yet well understood (Urban et al 2004).…”
Section: Introductionmentioning
confidence: 99%