Abstract
Current thinking holds that carbon autonomy of branches in trees is unlikely, particularly during bud break, when the new developing shoots require significant influx of carbon resources from more distant sources. Results from recent studies indicate that the impact of bud break on overall tree reserves might be small. In two studies the independence of flushing shoots from stored carbon reserves and the photosynthesis in developing new leaves and shoots of Populus tremuloides were explored. New developing shoots quickly became a positive carbon source and only a few days into flush, the photosynthetic system of the newly developing shoots was efficient enough to achieve positive carbon gain even at low light levels. Only 14% of the stored shoot reserves, without any mobilization from more distant reserves, were used during bud break and early shoot expansion. Without any underlying stress, shoots of deciduous trees appear to be carbon autonomous during bud break when demand on stored carbon should be the highest. The development of an efficient photosynthetic system in new shoots is critical in the recovery of carbon reserves in aspen. It minimizes the cost of bud break to the overall stored carbon reserves by optimizing the assimilation of carbon in the newly developed leaves, while eliminating the cost for mobilizing carbon reserves from more distant sources. This carbon autonomy of shoots has important implications for the whole tree carbon balance particularly to the non-photosynthetic tissues which functions solely depending on carbon export from the newly developing leaves and shoots.
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References
Aschan G, Pfanz H (2003) Non-foliar photosynthesis–a strategy of additional carbon acquisition. Flora 198:81–97
Aschan G, Wittmann C, Pfanz H (2001) Age-dependent bark photosynthesis of aspen twigs. TREES 15:431–437
Azcón-Bieto J, Osmond CB (1983) Relationship between photosynthesis and respiration. Plant Physiol 71:574–581
Chapin FS, Schulze ED, Mooney HA (1990) The ecology and economics of storage in plants. Ann Rev Ecol Syst 21:423–447
Chow P, Landhäusser SM (2004) A simplified method for measuring sugar and starch content in woody-plant tissues. Tree Physiol 24:1129–1136
Dickmann DI (1971) Photosynthesis and respiration by developing leaves of cottonwood (Populus deltoides Bartr). Bot Gazette 132:253–259
Dickmann DI, Kozlowski TT (1970) Mobilization and incorporation of photoassimilated C14 by growing vegetative and reproductive tissue of adult Pinus resinosa AIT trees. Plant Physiol 45:284–288
Gordon JC, Larson PR (1970) Redistribution of C14 labeled reserve food in young red pines during shoot elongation. For Sci 16:14–20
Gratani L (1996) Leaf and shoot growth dynamics of Quercus ilex L. Acta Oecol Int J Ecol 17:17–27
Hasegawa S, Koba K, Tayasu I, Takeda H, Haga H (2003) Carbon autonomy of reproductive shoots of Siberian alder (Alnus hirsuta var. sibirica). J Plant Res 116:183–188
Hoch G (2005) Fruit-bearing branchlets are carbon autonomous in mature broad-leaved temperate forest trees. Plant Cell Environ 28:651–659
Hoch G, Keel SG (2006) C13 labelling reveals different contributions of photoassimilates from infructescences for fruiting in two temperate forest tree species. Plant Biol 8:606–614
Imaji A, Seiwa K (2010) Carbon allocation to defense, storage, and growth in seedlings of two temperate broad-leaved tree species. Oecologia 162:273–281
Kozlowski TT (1992) Carbohydrate sources and sinks in woody plants. Bot Rev 58:107–222
Kozlowski TT, Pallardy SG (2002) Acclimation and adaptive responses of woody plants to environmental stresses. Bot Rev 68:270–334
Landhäusser SM, Lieffers VJ (1998) Growth of Populus tremuloides in association with Calamagrostis canadensis. Can J For Res 28:396–401
Landhäusser SM, Lieffers VJ (2003) Seasonal changes in carbohydrate reserves in mature northern Populus tremuloides clones. TREES 17:471–476
Landhäusser SM, Desrochers A, Lieffers VJ (2001) A comparison of growth and physiology in white spruce (Picea glauca) and aspen (Populus tremuloides) at different soil temperatures. Can J For Res 31:1922–1929
Larson PR, Gordon JC (1969) Leaf development, photosynthesis, and C14 distribution in Populus deltoides seedlings. Am J Bot 56:1058–1066
Marchi S, Sebastiani L, Gucci R, Tognetti R (2005) Sink-source transition in peach leaves during shoot development. J Am Soc Hort Sci 130:928–935
Martens L, Landhäusser SM, Lieffers VJ (2007) First-year growth response of cold-stored, nursery-grown aspen planting stock. New For 33:281–295
Newell EA, Mulkey SS, Wright SJ (2002) Seasonal patterns of carbohydrate storage in four tropical tree species. Oecologia 131:333–342
Potvin C, Lechowicz MJ, Tardif S (1990) The statistical analysis of ecophysiological response curves obtained from experiments involving repeated measures. Ecology 71:1389–1400
Protz CG, Silins U, Lieffers VJ (2000) Reduction in branch sapwood hydraulic permeability as a mechanism for crown recession in lodgepole pine. Can J For Res 30:1088–1095
Reiter IM, Haberle KH, Nunn AJ, Heerdt C, Reitmayer H, Grote R, Matyssek R (2005) Competitive strategies in adult beech and spruce: space-related foliar carbon investment versus carbon gain. Oecologia 146:337–349
Schädel C, Blochl A, Richter A, Hoch G (2009) Short-term dynamics of nonstructural carbohydrates and hemicelluloses in young branches of temperate forest trees during bud break. Tree Physiol 29:901–911
Sellin A, Kupper P (2005a) Variation in leaf conductance of silver birch: effects of irradiance, vapour pressure deficit, leaf water status and position within a crown. For Ecol Manage 206:153–166
Sellin A, Kupper P (2005b) Effects of light availability versus hydraulic constraints on stomatal responses within a crown of silver birch. Oecologia 142:388–397
Sprugel DG (2002) When branch autonomy fails: Milton’s Law of resource availability and allocation. Tree Physiol 22:1119–1124
Sprugel DG, Hinckley TM (1988) The branch autonomy theory. In: Winner WE, Phelps LB (eds) Response of trees to air pollution: the role of branch studies. Proceedings of Workshop, November 5–6, 1987, Boulder, CO, pp 1–19
Sprugel DG, Hinckley TM, Schaap W (1991) The theory and practice of branch autonomy. Ann Rev Ecol Syst 22:309–334
Turgeon R (1989) The sink-source transition in leaves. Ann Rev Plant Physiol Plant Mol Biol 40:119–138
Volpe G, Bianco LB, Rieger M (2008) Carbon autonomy of peach shoots determined by C13-photoassimilate transport. Tree Physiol 28:1805–1812
Acknowledgments
I thank Alison Lennie and Ian Curran for their assistance with the physiological measurements and Pak Chow with the carbohydrate analyses. I thank Justine Karst for her comments on an earlier draft of this manuscript. This study has been supported by the Natural Sciences and Engineering Research Council of Canada (NSERC).
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Communicated by H. Rennenberg.
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Landhäusser, S.M. Aspen shoots are carbon autonomous during bud break. Trees 25, 531–536 (2011). https://doi.org/10.1007/s00468-010-0532-8
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DOI: https://doi.org/10.1007/s00468-010-0532-8