Screening of certain mangroves for photosynthetic carbon metabolic pathway

Autor: A. Senthilkumar, Venugopalan Venkatesalu, M. Chandrasekaran, Krishnan Kannathasan
Rok vydání: 2008
Předmět:
Zdroj: Photosynthetica. 46:622-626
ISSN: 1573-9058
0300-3604
DOI: 10.1007/s11099-008-0105-x
Popis: The mangroves Rhizophora lamarkii, Ceriops roxburghiana, Bruguiera gymnorrhiza, Aegiceras corniculatum, and Lumnitzera racemosa were screened for their carbon metabolic pathways by measuring net photosynthetic rate (PN), 13 C discrimination rate, leaf anatomy, titratable acidity, and activities of phosphoenolpyruvate carboxylase, NADH-malate dehydrogenase, alanine aminotransferase, aspartate aminotransferase, and pyruvate phosphate dikinase. The tested mangroves had a well developed succulence, opening of stomata during day time and closure in the night hours, and absence of diurnal fluctuation of organic acids in their leaves which excludes the possibility of these species being CAM plants. Moreover, the leaf anatomy had not exhibited Kranz syndrome. The high values of discrimination against 13 C, low PN, high CO2 compensation concentration, and the activities of aminotransferases in the direction of alanine formation suggest that the species may follow C3 mode of carbon metabolic pathway.
Databáze: OpenAIRE
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