Abstract
In earlier-maturing coffee clones, owing to the shorter time required for fruit filling and ripening, photo-assimilates should be transported to fruits in a period shorter than that found in intermediate- or late-maturing clones. We hypothesised that at a given source-to-sink ratio, a presumably greater sink strength in early-maturing clones relative to intermediate- and late-maturing individuals should be correlated to increased rate of net carbon assimilation (A) and greater photo-assimilate transport to the fruits. Overall, earlier-maturing clones displayed greater A rates than the intermediate-maturing clones, which, in turn, had higher A than their late counterparts. Changes in A were largely associated with changes in stomatal conductance. Only marginal alterations occurred in the internal-to-ambient CO2 concentration ratio, the carbon isotope composition ratio, soluble sugars and chlorophyll a fluorescence parameters. Some changes in starch pools were detected among treatments. To the best of our knowledge, this is the first report showing evidence that increased precociousness of fruit growth and maturation results in higher A and thus increased source strength, a fact associated to a large degree with higher stomatal aperture.
References
Antunes WC, Pompelli MF, Carretero DM, DaMatta FM (2008) Allometric models for non-destructive leaf area estimation in coffee (Coffea arabica and C. canephora). Ann Appl Biol 153:33–40
Ben Mimoun M, Longuenesse J–J, Genard M (1996) Pmax as related to leaf:fruit ratio and fruit assimilate demand in peach. J Hortic Sci 71:767–775
Chaves ARM, Ten-Caten A, Pinheiro HA, Ribeiro A, DaMatta FM (2008) Seasonal changes in photoprotective mechanisms of leaves from shaded and unshaded field-grown coffee (Coffea arabica L.) trees. Trees 22:351–361
DaMatta FM, Ronchi CP (2007) Aspectos fisiológicos do café conilon. In: Ferrão RG, Fonseca AFA, Bragança SM, Ferrão MAG, De Muner LH (eds) Café conilon. Incaper, Vitória, pp 95–119
DaMatta FM, Loos RA, Silva EA, Loureiro ME (2002a) Limitations to photosynthesis in Coffea canephora as a result of nitrogen and water availability. J Plant Physiol 159:975–981
DaMatta FM, Loos RA, Silva EA, Ducatti C, Loureiro ME (2002b) Effects of soil water deficit and nitrogen nutrition on water relations and photosynthesis of pot-grown Coffea canephora Pierre. Trees 16:555–558
DaMatta FM, Cunha RL, Antunes WC, Martins SVC, Araújo WL, Fernie AR, Moraes GABK (2008) In field-grown coffee trees source-sink manipulation alters photosynthetic rates, independently of carbon metabolism, via alterations in stomatal function. New Phytol 178:348–357
DaMatta FM, Ronchi CP, Maestri M, Barros RS (2010) Coffee: environment and crop physiology. In: DaMatta FM (ed) Ecophysiology of tropical tree crops. Nova Science, New York, pp 181–216
Demmig-Adams B, Adams WW III (1992) Photoprotection and other responses of plants to high light stress. Annu Rev Plant Physiol Plant Mol Biol 43:599–626
Duan W, Fan PG, Wang LJ, Li WD, Yan ST, Li SW (2008) Photosynthetic response to low sink demand after fruit removal in relation to photoinhibition and photoprotection in peach trees. Tree Physiol 28:123–132
Farquhar GD, Ehleringer JR, Hubik KT (1989) Carbon isotope discrimination and photosynthesis. Annu Rev Plant Physiol Plant Mol Biol 40:503–537
Ferrão RG, Fonseca AFA, Ferrão MAG, Bragança SM, Verdin Filho AC, Volpi PS (2007) Culivares de café conilon. In: Ferrão RG, Fonseca AFA, Bragança SM, Ferrão MAG, De Muner LH (eds) Café conilon. Incaper, Vitória, pp 203–225
Franck N, Vaast P, Génard M, Dauzat J (2006) Soluble sugars mediate sink feedback down-regulation of leaf photosynthesis in field-grown Coffea arabica. Tree Physiol 26:517–525
Gordon AJ, Hesketh JD, Peters DB (1982) Soybean leaf photosynthesis in relation to maturity classification and stage of growth. Photosynth Res 3:81–93
Iglesias JD, Lliso I, Tadeo FR, Talon M (2002) Regulation of photosynthesis through source: sink imbalances in citrus is mediated by carbohydrate content in leaves. Physiol Plant 116:563–572
McCormick AJ, Cramer MD, Watt DA (2006) Sink strength regulates photosynthesis in sugarcane. New Phytol 171:759–770
Oxborough K, Baker NR (1997) Resolving chlorophyll a fluorescence images of photosynthetic efficiency into photochemical and non-photochemical components––calculation of qP and F v′/F m′ without measuring F 0′. Photosynth Res 54:135–142
Paul MJ, Foyer CH (2001) Sink regulation of photosynthesis. J Exp Bot 52:1383–1400
Paul MJ, Pellny TK (2003) Carbon metabolite feedback regulation of leaf photosynthesis and development. J Exp Bot 54:539–547
Praxedes SC, DaMatta FM, Loureiro ME, Ferrão MAG, Cordeiro AT (2006) Effects of long-term soil drought on photosynthesis and carbohydrate metabolism in mature robusta coffee (Coffea canephora Pierre var. kouillou) leaves. Environ Exp Bot 56:263–273
Ronchi CP, DaMatta FM, Batista KD, Moraes GABK, Loureiro ME, Ducatti C (2006) Growth and photosynthetic down-regulation in Coffea arabica in response to restricting root volume. Funct Plant Biol 33:1013–1023
Shimono H, Okada M, Yamakawa Y, Nakamura H, Kobayashi K, Hasegawa T (2009) Genotypic variation in rice yield enhancement by elevated CO2 relates to growth before heading, and not to maturity group. J Exp Bot 60:523–532
Urban L, Léchaudel M, Lu P (2004) Effect of fruit load and girdling on leaf photosynthesis in Mangifera indica L. J Exp Bot 55:2075–2085
Zhang C, Tanabe K, Tamura F, Itai A, Wang S (2005) Partitioning of 13C-photosynthate from spur leaves during fruit growth of three Japanese pear (Pyrus pyrifolia) cultivars differing in maturation date. Ann Bot 95:685–693
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This research was supported by the Brazilian Consortium for Coffee Research and Development. Scholarships granted by CAPES and CNPq from the Brazilian Government are gratefully acknowledged.
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Communicated by A. Gessler.
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Morais, L.E., Cavatte, P.C., Detmann, K.C. et al. Source strength increases with the increasing precociousness of fruit maturation in field-grown clones of conilon coffee (Coffea canephora) trees. Trees 26, 1397–1402 (2012). https://doi.org/10.1007/s00468-012-0685-8
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DOI: https://doi.org/10.1007/s00468-012-0685-8