Oecologia

, Volume 137, Issue 1, pp 1–9 | Cite as

Reproductive allocation of an annual, Xanthium canadense, at an elevated carbon dioxide concentration

  • Toshihiko Kinugasa
  • Kouki Hikosaka
  • Tadaki Hirose
Ecophysiology

Abstract

Stimulation of vegetative growth by an elevated CO2 concentration does not always lead to an increase in reproductive yield. This is because reproductive yield is determined by the fraction of biomass allocated to the reproductive part as well as biomass production. We grew Xanthium canadense at low N (LN) and high N levels (HN) under an ambient (360 μmol mol-1) and elevated (700 μmol mol-1) CO2 concentration ([CO2]) in open-top chambers. Reproductive yield was analysed as the product of: (1) the duration of the reproductive period, (2) the rate of dry mass acquisition in the reproductive period, and (3) the fraction of acquired biomass allocated to the reproductive part. Elevated [CO2] increased the total amount of biomass that was allocated to reproductive structures, but this increase was caused by increased capsule mass without a significant increase in seed production. The increase in total reproductive mass was due mainly to an increase in the rate of dry mass acquisition in the reproductive period with a delay in leaf senescence. This positive effect was partly offset by a reduction in biomass allocation to the reproductive part at elevated [CO2] and HN. The duration of the reproductive period was not affected by elevated [CO2] but increased by HN. Seed production was strongly constrained by the availability of N for seed growth. The seed [N] was very high in X. canadense and did not decrease significantly at elevated [CO2]. HN increased seed [N] without a significant increase in seed biomass production. Limited seed growth caused a reduction in biomass allocation to the reproductive part even though dry mass production was increased due to increased [CO2] and N availability.

Keywords

Growth analysis Nitrogen Reproductive yield Seed production 

Notes

Acknowledgements

We thank K. Sato, H. Nagashima, Y. Shitaka, B. Geng, T. Yamano and Y. Onoda for advise and help in the experiment and N. P. R. Anten and O. Muller for comments on an earlier draft. This work was supported in part by grants-in-aid from the Japan Ministry of Education, Science and Culture.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Toshihiko Kinugasa
    • 1
  • Kouki Hikosaka
    • 1
  • Tadaki Hirose
    • 1
  1. 1.Graduate School of Life SciencesTohoku UniversitySendaiJapan

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