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Photosynthetic rate model in response to environmental parameters for Avicennia marina (Forssk.) Veih. in an Indian mangrove forest

100%

Kumar T. , Panigrahy S. , Manjunath K. R. , Singh C. P.

2012

tom 34

nr 4

Photosynthetic rate models at leaf levels, viz., upper and middle canopy leaves were constructed separately in response of photosynthesis of Indian Avicennia marina to environmental variables as a major indication. The final expressions for the rates of photosynthesis were achieved by incorporating a combination of parameters involved in two separate models (already existing); namely, biochemical photosynthetic model and stomatal conductance model as inputs to two-stage least squares fitting regression method. The distinctiveness of the responses of photosynthesis in the two types of leaves to diurnally changeable factors, including solar radiation, temperature, CO₂ concentrations, water content in the atmosphere, vapour pressure deficit and relative humidity, were investigated in the respective models. Analyses of the physiological data of the leaves measured in the months of January–February indicated satisfactory performance of the models in the simulation of the respective photosynthetic rates (r² values, 0.97 and 0.96 for upper and middle canopy leaves, respectively).

Preliminary GC-MS analysis of compounds present in the root exudates of three mangrove species

100%

Kumar T. , Ray S. , Brahmachary R. L. , Ghose M.

Acta Chromatographica

2009

tom Vol. 21, no. 1

117-125

Root exudates were obtained from three mangrove species, viz. Bruguiera gymnorrhiza, Excoecaria agallocha, and Heritiera fomes. Spot tests revealed the presence of, presumably, phenolic compounds in the exudates. Paper chromatography revealed two spots each for B. gymnorrhiza and H. fomes and a single spot for E. agallocha. GC-MS analysis suggested the presence of aminopyrine, palmitic acid, stearic acid, di- n -propyl ether, and 2,5-anhydrogluconic acid in B. gymnorrhiza exudates, aminopyrine and palmitic acid in E. agallocha exudates, and aminopyrine, palmitic acid, and 2,5-anhydrogluconic acid in H. fomes exudates.