Photosynthetica 2008, 46(4):622-626 | DOI: 10.1007/s11099-008-0105-x

Screening of certain mangroves for photosynthetic carbon metabolic pathway

V. Venkatesalu1,*, A. Senthilkumar1, M. Chandrasekaran1, K. Kannathasan1
1 Department of Botany, Annamalai University, Annamalainagar, Tamil Nadu, India

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 (P N), 13C 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 13C, low P N, 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.

Additional key words: alanine aminotransferase; asparate aminotransferase; 13C discrimination; C3 carbon metabolic pathway; Kranz syndrome; NADPH-malate dehydrogenase; net photosynthetic rate; phosphoenolpyruvate carboxylase; pyruvate phosphate kinase; stomata opening

Received: January 24, 2008; Accepted: July 2, 2008; Published: December 1, 2008  Show citation

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Venkatesalu, V., Senthilkumar, A., Chandrasekaran, M., & Kannathasan, K. (2008). Screening of certain mangroves for photosynthetic carbon metabolic pathway. Photosynthetica, 46(4), 622-626. doi: 10.1007/s11099-008-0105-x
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