TITLE

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

AUTHOR(S)
Arbicheva, A. I.; Pautov, A. A.; Voitsekhovskaya, O. V.
PUB. DATE
December 2012
SOURCE
Vestnik Sankt-Peterburgskogo universiteta, Seriia 7: Geologia, G;2012, Issue 4, p136
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
94324710

 

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