Journal of Plant Research

, Volume 108, Issue 3, pp 277–281 | Cite as

Ecological differentiation ofEuphorbia lasiocaula andE. sinanensis (Euphorbiaceae) I plant height, phenology and allocation to stems and leaves

  • Takahide Kurosawa
Original Articles

Abstract

Resource allocation and the seasonal change of stem length inEuphorbia lasiocaula Boiss. andE. sinanensis (Hurusawa) T. Kurosawa et H. Ohashi were examined in 10 populations on hills in Miyagi Prefecture, northern Japan. Differences were found in the diameter of stem, stem/leaf ratio of dry weight, vegetative dry weight/leaf area, and the beginning, end and duration of stem growth.Euphorbia lasiocaula has a thicker stem, a larger stem/ leaf ratio, a larger vegetative dry weight/leaf area, a later beginning and end of stem growth and a longer period of stem growth thanE. sinanensis. These differences support the relationships among plant height, resource allocation and phenology predicted by the mathematical models of Givnish (1982) and Sakai (1991, 1994). The tall and thick stems ofE. lasiocaula are considered to be favorable for capturing sunlight in grassy places, causing it to allocate much of its resources to the stems. On the other hand,E. sinanensis is considered to be adapted to deciduous forest floors or forest margins because it completes growing before it is shaded by canopy trees or by tall herbs, which is enabled by the larger allocation of resources to the leaves.

Key words

Euphorbia lasiocaula Euphorbia sinanensis Habitat Plant height Stem growth Stem/leaf ratio 

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References

  1. Abrahamson, W. G. andGadgil, M. 1973. Growth form and reproductive effort in goldenrods (Solidago, Compositae). Am. Nat.107: 651–661.CrossRefGoogle Scholar
  2. Brouillet, L. andSimon, J.-P. 1979. Resource allocation and phenology of two species ofAster (Asteraceae) and their hybrid. Can. J. Bot.57: 1792–1799.Google Scholar
  3. Crawley, M.J. 1986. Life history and environment.In M. J. Crawley, ed., Plant Ecology, Blackwell Scientific Publications, Oxford. pp. 253–290.Google Scholar
  4. Givnish, T.J. 1982. On the adaptive significance of leaf height in forest herbs. Am. Nat.120: 353–381.CrossRefGoogle Scholar
  5. Givnish, T.J. 1986. Biomechanical constraints on crown geometry in forest herbs.In T.J. Givnish, ed., On the Economy of Plant Form and Function. Cambridge University Press, Cambridge. pp. 525–583.Google Scholar
  6. Grime, J.P. 1979. Plant Strategies and Vegetation Processes. John Wiley & Sons, Ltd., Chichester.Google Scholar
  7. Haraguchi, A. 1993. Phenotypic and phenological plasticity of an aquatic macrophyteMenyanthes trifoliata L. J. Plant Res.106: 31–35.CrossRefGoogle Scholar
  8. Iwasa, Y., Cohen, D. andLeon, J.A. 1985. Tree height and crown shape, as results of competitive games. J. theor. Biol.112: 279–297.Google Scholar
  9. Kurosawa, T. andOhashi, H. 1994. Morphological, phenological and taxonomical studies onEuphorbia lasiocaula andE. sinanensis (Euphorbiaceae). J. Jpn. Bot.69: 1–13.Google Scholar
  10. Maximowicz, C.J. 1883. Diagnoses plantarum novarum Asiaticarum. V. Bull. Acad. Sci. St. Pétersb.29: 51–227.Google Scholar
  11. Reid, A. 1964. Light intensity and herb growth in white oak forests. Ecology45: 396–398.Google Scholar
  12. Rice, W.R. 1989. Analyzing tables of statistical tests. Evolution43: 223–225.Google Scholar
  13. Sakai, S. 1991. A model analysis for the adaptive architecture of herbsceous plants. J. theor. Biol.148: 535–544.Google Scholar
  14. Sakai, S. 1994. Optimal leaf phenology and photosynthetic capacity of herbs dependent on the genet density of herbs in their habitat. J. theor. Biol.166: 237–244.CrossRefGoogle Scholar
  15. Stutzel, H., Charles-Edwards, D.A. andBeech, D.F. 1988. A model of the partitioning of new above-ground dry matter. Ann. Bot.61: 481–487.Google Scholar
  16. Sugawara, K. 1969. Ecological studies in the Botanical Garden of the Tôhoku University. I. Present state of the vegetation. Ecol. Rev.17: 209–216.Google Scholar
  17. Waller, D.M. 1986. The dynamics of growth and form.In M.J. Crawley, ed., Plant Ecology. Blackwell Scientific Publications, Oxford. pp. 291–320.Google Scholar
  18. Webster, G.L. 1967. The genera of Euphorbiaceae in the southeastern United States. J. Arnold Arbor.48: 303–430.Google Scholar

Copyright information

© The Botanical Society of Japan 1995

Authors and Affiliations

  • Takahide Kurosawa
    • 1
  1. 1.Biological Institute, Faculty of ScienceTohoku UniversitySendaiJapan

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