Summary
Shoot systems developed over 3 successive years were investigated on 55 understorey Tsuga canadensis (L.) Carr. trees. Paired comparisons of preformed-leaf content of terminal buds and numbers of leaves produced on new shoots showed that neoformed leaves were produced in large numbers. Parent-shoot character was not useful in predicting numbers of preformed leaves, was better related to total leaves produced, but left the majority of the variation unexplained. This reflected the capacity of any terminal bud to produce a shoot with more or less neoformation, depending on conditions for growth. All shoots over 6 cm long produced sylleptic shoots that bore from two to many leaves and were arranged in a mesitonic pattern along the parent. Some of the longer sylleptic shoots produced lateral buds or second-order sylleptic shoots. Monopodial second-year extensions of sylleptic-shoot axes followed an acrotonic pattern, as did proleptic shoots from the few lateral buds borne on the parent shoots. Such lateral buds were more frequent on shorter parent shoots: they typically occurred near the proximal and distal ends. Duration of shoot extension was positively correlated with shoot length: terminal buds became evident as shoot extension neared cessation.
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References
Ashton PS (1978) Crown characteristics of tropical trees. In: Tomlinson PB, Zimmermann MH (eds) Tropical trees as living systems. Cambridge University Press, Cambridge, pp 591–615
Baxter SM, Cannell MGR (1978) Branch development on leaders of Picea sitchensis. Can J For Res 8: 121–128
Boojh R, Ramakrishnan PS (1982a) Growth strategies of trees related to successional status. I. Architecture and extension growth. For Ecol Manage 4: 359–374
Boojh R, Ramakrishnan PS (1982b) Growth strategies of trees related to successional status. II. Leaf dynamics. For Ecol Manage 4: 357–386
Cannell MGR, Thompson S, Lines R (1976) An analysis of inherent differences in shoot growth within some north-temperate conifers. In: Cannell MGR, Last FT (eds) Tree physiology and yield improvement. Academic Press, London, pp 173–205
Champagnat P (1954) Recherches sur les “rameaux anticipés” des végètaux ligneux. Rev Cytol Biol Veg 15: 1–51
Champagnat P (1965) Rameaux courts et rameaux longs: problémes physiologiques. In: Ruhland W (ed) Differentiation and development. I. Encyclopedia of plant physiology, vol 15. Springer, Berlin Heidelberg New York, pp 1165–1171
Champagnat P (1978) Formation of the trunk in woody plants. In: Tomlinson PB, Zimmermann MH (eds) Tropical trees as living systems. Cambridge University Press, Cambridge, pp 401–422
Clausen JJ, Kozlowski TT (1967) Seasonal growth characteristics of long and short shoots of tamarack. Can J Bot 45: 1643–1651
Critchfield WB (1960) Leaf dimorphism in Populus trichocarpa. Am J Bot 47: 699–711
Critchfield WB (1970) Shoot growth and heterophylly in Ginkgo biloba. Bot Gaz 131: 150–162
Critchfield WB (1971) Shoot growth and heterophylly in Acer, J Arnold Arbor Harv Univ 52: 240–246
Curtis JD, Lersten NR (1978) Heterophylly in Populus grandidentata (Salicaceae) with emphasis on resin glands and extrafloral nectaries. Am J Bot 65: 1003–1010
Edelin C (1981) Quelques aspects de l'architecture végètative des coniféres. Bull Soc Bot Fr Lettres Bot 128: 177–188
Gregory RA (1980) Annual cycle of shoot development in sugar maple. Can J For Res 10: 316–326
Hallé F, Oldeman RAA, Tomlinson PB (1978) Tropical trees and forests. An architectural analysis. Springer, Berlin Heidelberg New York
Hibbs DE (1981) Leader growth and the architecture of three North American hemlocks. Can J Bot 59: 476–480
Horn HS (1971) The adaptive geometry of trees. Princeton University Press, Princeton, NJ
Kennedy D, Brown IR (1984) Crown development and shoot growth in Betula pendula Roth, and its implications for forestry and arboriculture. Arboric J 8: 245–257
Kozlowski TT, Clausen JJ (1966) Shoot growth characteristics of heterophyllous wood plants. Can J Bot 44: 827–843
Kozlowski TT, Ward RC (1961) Shoot elongation characteristics of forest trees. For Sci 7: 357–368
MacDonald JE, Powell GR (1985) First growing period development of Acer saccharum stump sprouts arising after different dates of cut. Can J Bot 819–828
Marks PL (1975) On the relation between extension growth and successional status of deciduous trees of the north-eastern United States. Bull Torrey Bot Club 102: 172–177
Mergen F (1958) Distribution of reaction wood in eastern hemlock as a function of its terminal growth. For Sci 4: 98–109
Mitchell AF (1965) The growth in early life of the leading shoot of some conifers. Forestry 38: 121–136
Owens JN, Molder M (1973) Bud development in western hemlock. I. Annual growth cycle of vegetative buds. Can J Bot 51: 2223–2231
Owens JN, Molder M (1979) Bud development in Larix occidentalis. I. Growth and development of vegetative long shoot and vegetative short shoot buds. Can J Bot 57: 687–700
Pollard DFW (1974) Bud morphogenesis of white spruce Picea glauca seedlings in a uniform environment. Can J Bot 52: 1569–1571
Pollard DFW, Logan KT (1976) Inherent variation in “free” growth in relation to numbers of needles produced by provenances of Picea mariana. In: Cannell MGR, Last FT (eds) Tree physiology and yield improvement. Academic Press, London, pp 245–251
Pollard DFW, Selby RD (1976) A simple micromanipulator for conifer bud analysis. Can J For Res 6: 244–245
Powell GR (1977) Patterns of development in Abies balsamea crowns and effects of megastrobilus production on shoots and buds. Can J For Res 7: 498–509
Powell GR (1987) Syllepsis in Larix laricina: analysis of tree leaders with an without sylleptic long shoots. Can J For Res 17: 490–498
Powell GR (1988a) Syllepsis: possible ramifications for selection of tamarack trees (abstract). In: Morgenstern EK, Boyle TJB (eds) Proceedings of the 21st meeting of the Canadian Tree Improvement Association, 17–21 August 1987, Truro NS, part 2. Canadian Forestry Service, Ottawa, p 196
Powell GR (1988b) Shoot elongation, leaf demography and bud formation in relation to branch position in Larix laricina saplings. Trees 2: 150–164
Powell GR, Vescio SA (1986) Syllepsis in larix laricina: occurrence and distribution of sylleptic long shoots and their relationships with age and vigour in young plantation-grown trees. Can J for Res 16: 597–607
Powell GR, Tosh KJ, MacDonald JE (1982) Indeterminate shoot extension and heterophylly in Acer saccharum. Can J For Res 12: 166–170
Remphrey WR, Powell GR (1984a) Crown architecture of Larix laricina saplings: quantitative analysis and modelling of (nonsylleptic) order 1 branching in relation to development of the main stem. Can J Bot 1904–1915
Remphrey WR, Powell GR (1984b) Crown architecture of Larix laricina saplings: shoot preformation and neoformation and their relationships to shoot vigour. Can J Bot 62: 2181–2192
Remphrey WR, Powell GR (1985) Crown architecture of Larix laricina saplings: sylleptic branching on the main stem. Can J Bot 63: 1296–1302
Remphrey WR, Powell GR (1987) Crown architecture of Larix laricina saplings: an analysis of higher-order branching. Can J Bot 65: 268–279
Remphrey WR, Powell GR (1988) Crown architecture of Larix laricina saplings: production and disposition of foliage and their simulation. Can J Bot 66: 2234–2246
SAS Institute Inc (1985a) SAS User's guide: basics, versin 5 edition. SAS Institute Inc., Cary, NC
SAS Institute Inc (1985b) SAS User's guide: statistics, version 5 edition. SAS Institute Inc., Cary, NC
Späth HL (1912) Der Johannistrieb. Parey, Berlin
Tomlinson PB, Gill AM (1973) Growth habits of tropical trees: some guiding principles. In: Meggers BJ, Ayensu ES, Duckworth WD (eds) Tropical forest ecosystems in Africa and South America: a comparative review. Smithsonian Institution Press, Washington, D.C., pp 129–143
Walters J, Soos J (1963) Shoot growth patterns of some British Columbia conifers. For Sci 9: 73–85
Wilson BF (1968) Red maple stump sprouts: development the first year. Harv For Pap No 18
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Powell, G.R. Preformed and neoformed extension of shoots and sylleptic branching in relation to shoot length in Tsuga canadensis . Trees 5, 107–116 (1991). https://doi.org/10.1007/BF00227493
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DOI: https://doi.org/10.1007/BF00227493