oxygenase activity. Now that you know that the C plants lack photorespiration, you probably can understand why productivity and yields are better in these plants. In addition these plants show tolerance to higher temperatures. Based on the above discussion can you compare plants showing the C and the C pathway?
Use the table format given in table . and fill in the information. T ABLE . Fill in the Columns and in this table to highlight the differences between C and C Plants Characteristics C Plants C Plants Choose from Cell type in which the Calvin Mesophyll/Bundle sheath/both cycle takes place Cell type in which the initial Mesophyll/Bundle sheath /both carboxylation reaction occurs How many cell types does the Two: Bundle sheath and leaf have that fix CO .
mesophyll One: Mesophyll Three: Bundle sheath, palisade, spongy mesophyll Which is the primary CO acceptor RuBP/PEP/PGA Number of carbons in the / / primary CO acceptor Which is the primary CO PGA/OAA/RuBP/PEP fixation product No. of carbons in the primary / / CO fixation product Does the plant have RuBisCO? Yes/No/Not always Does the plant have PEP Case? Yes/No/Not always Which cells in the plant have Mesophyll/Bundle sheath/none Rubisco?
CO fixation rate under high Low/ high/ medium light conditions Whether photorespiration is High/negligible/sometimes present at low light intensities Whether photorespiration is High/negligible/sometimes present at high light intensities Whether photorespiration would be High/negligible/sometimes present at low CO concentrations Whether photorespiration would be High/negligible/sometimes present at high CO concentrations Temperature optimum - C/ -25C/above C Examples Cut vertical sections of leaves of different plants and observe under the microscope for Kranz anatomy and list them in the appropriate columns.