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

  • 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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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&gt; Lem. (Araucariaceae) perennial leaves. Biological Communications, (4), 20–26. Retrieved from https://biocomm.spbu.ru/article/view/3196
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