Special forms of photosynthesis C4 and CAM

In this one-day course we examine the special mechanisms of photosynthesis in C4 and CAM (crassulacean acid metabolism) plants. These plants are well adapted to warm, dry habitats with high light intensities and initially fix carbon in the form of C4 carboxylic acids, and not in the form of 3PGA.

We will examine the marked diurnal variation of acidity of CAM-plants by measuring the pH of extracts harvested after either a dark or a light period. The actual contents of malic acid in the extracts will be measured with an enzymatic assay using quantitative photometry.

The special anatomy of C4 plants and the resulting spatial separation of C4 fixation and Calvin cycle will be examined microscopically.

This course is suited for students of grades 11 to 13 and can be combined with the course: "Light reaction of photosynthesis - experiments on photosynthetic pigments and electron transport". 

Duration: 1 day
Number of participants: max. 24