Age-related changes of photosynthesis rate and assimilates export in Agathis brownii Lem. (Araucariaceae) perennial leaves

Authors

  • Alisa Arbicheva Saint Petersburg State University, 7–9, Universitetskaya nab., Saint Petersburg, 199034, Russian Federation
  • Anatoly Pautov Saint Petersburg State University, 7–9, Universitetskaya nab., Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0001-7603-4539
  • Olga Voitsekhovskaja V. L. Komarov Botanical Institute of the RAS, 2, ul. Professora Popova, St. Petersburg, 197376, Russian Federation https://orcid.org/0000-0003-0966-1270

Abstract

Perennial leaves of Agathis brownii remain alive on the stems for over 10 years. The article shows that the photosynthetic gas exchange rate of the leaves of A. brownii decreased with leaf age while the amount of photosynthetic pigments increased, which makes it possible to characterize the 7-years-old as “more shadow” comparing to the first-year-leaves. The number of sieve cells with preserved structure decreases with the age of the leaves which is accompanied with a drop in the phloem loading rate. The source function of several-years-old leaves thus diminishes but their positive carbon balance is probably maintained.

Keywords:

Agathis brownii, photosynthesis, photosynthetic pigments, phloem loading, vascular bundles, assimilation

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Vestnik of Saint Petersburg University. Series 3. Biology

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Published

2012-12-28

How to Cite

Arbicheva, A., Pautov, A., & Voitsekhovskaja, O. (2012). Age-related changes of photosynthesis rate and assimilates export in <em>Agathis brownii</em> Lem. (Araucariaceae) perennial leaves. Biological Communications, (4), 20–26. Retrieved from https://biocomm.spbu.ru/article/view/3196

Issue

No. 4 (2012)

Section

Full communications

License

Articles of Biological Communications are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.