Oecologia

, Volume 87, Issue 3, pp 377–387

Plasticity and acclimation to light in tropical Moraceae of different sucessional positions

  • S. Strauss-Debenedetti
  • F. A. Bazzaz
Original Papers

DOI: 10.1007/BF00634595

Cite this article as:
Strauss-Debenedetti, S. & Bazzaz, F.A. Oecologia (1991) 87: 377. doi:10.1007/BF00634595

Summary

We evaluated both the photosynthetic plasticity and acclimation to light of seedlings of five co-occurring tropical tree species in the Moraceae,Cecropia obtusifolia, Ficus insipida, Poulsenia armata, Brosimum alicastrum, andPseudolmedia oxyphyllaria. Distinct differences in the species' abilities to respond to increasing irradiance correlated with their known habitat breadths and successional status. The early successinalsCecropia andFicus exhibited the highest photosynthetic rates and conductance values in high light. There was a several-fold difference in assimilation across light regimes, consistent with a high physiological plasticity. When individuals grown at low light were transferred to higher irradiances, seedlings of bothCecropia andFicus produced leaves which photosynthesized at rates as high or higher than those of plants continuously grown in high light, indicating a high photosynthetic acclimation potential. In contrast, the late successionals were characterized by both a more restricted physiological plasticity and acclimation potential. Higher light levels resulted in only moderate increases in assimilation among the late successionals, and onlyBrosimum acclimated fully to increased irradiances. NeitherPoulsenia norPseudolmedia increased appreciably their photosynthetic rates when transferred to high light. This suggests that acclimation potential cannot always be inferred from plasticity responses, and calls for a reevaluation of arguments developed solely from plasticity studies. Finally, differences between the early and late successional species in the allocation of nitrogen into RuBP carboxylase and thylakoid nitrogen pools or non-photosynthetic compounds are suggested by the distinct relationships between maximum photosynthetic capacity and nitrogen content.

Key words

Photosynthetic acclimation/plasticity Sun/shade responses Tropical trees/seedlings 

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • S. Strauss-Debenedetti
    • 1
  • F. A. Bazzaz
    • 2
  1. 1.Yale School of Forestry & Environmental StudiesNew HavenUSA
  2. 2.Department of Organismic and Evolutionary BiologyHarvard UniversityCambridgeUSA

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