Light response curve analysis of your data
Light response curve analysis of your data
Mechanistic A/Ci analysis of your data
Daylength and irradiance calculations
Water vapour pressure calculations
Leaf energy balance determination
Photosyn Assistant uses your data collected from the measurement of leaf or algal photosynthesis and determines a range of photosynthetic parameters, based on this data. It permits the direct calculation and modelling of light response curves, ACi response curves and 16 other applications, all relating to the measurement and analysis of photosynthesis. From the light and CO2 responses the program can estimate apparent quantum efficiency, saturation levels, compensation points and carboxylation efficiency. The program incorporates and updates our previously released ACi and AQ analysis software.
This software is now available for purchase and is provided with a manual, example data and a complete help file. It is useful for both research and teaching.
Photosyn Assistant is designed to help in the interpretation, comparison and modelling of photosynthesis. Data collected by IRGA or oxygen electrode analysis of gas exchange rates of leaves or algae can be transferred to the program to determine the response of CO2 concentrations and light levels on the photosynthetic activity. Equations that describe these relationships in empirical (fitted) or mechanistic (relate to underlying chemistry) terms provide parameters that are useful for comparisons between treatments and species. These statistics are values such as CO2 compensation points, apparent quantum efficiency and Vc max (the maximum rate of rubisco carboxylation).
The mechanistic analysis of A/Ci data permits the determination of Vcmax, Jmax and TPU from A/Ci data that may be obtained using IRGAs. It uses the models of Farquhar and von Cammeraer (1981) with subsequent modifications, to obtain an iterative estimate of these parameters of photosynthesis. It is considerably more direct to use than comparative statistical programming based methods.
The reponse of photosynthesis to light (AQ curves) is analysed using the standard method of Prioul and Chartier (1977). This permits estimation of respiration, apparent quantum efficiency, convexity, Amax and light compensation point. Comparisons of treatment effects on these parameters are easily determined.Modelling. The programs contained in Photosyn Assistant permit the modelling of data entered by the user. For instance you can investigate how increases in apparent quantum efficiency or convexity influence the light response curve produced.
Price and ordering information
E-mail richard@ddsci.com if you wish to make comments or suggestions about the program.
Home-page || Products || Service || Information || Ordering
Chlorophyll determinations