Chapter 22

Describe the similarities and differences between the lichen and coral symbioses. (Sections 22.1, 22.14)

In the "Chlorochromatium" symbiosis, how does each partner benefit? (Section 22.2)

Describe the steps in the development of root nodules on a leguminous plant. What is the nature of the recognition between plant and bacterium and how do Nod factors help control this? How does this compare with recognition in the Agrobacteriumplant system? (Sections \(22.3\) and 22.4)

Compare and contrast the production of a plant tumor by Agrobacterium tumefaciens and a root nodule by a Rhizobium species. In what ways are these structures similar? In what ways are they different? Of what importance are plasmids to the development of both structures? (Sections \(22.3\) and 22.4)

How do mycorrhizae improve the growth of trees? In what way(s) are the root nodule and mycorrhizal symbioses similar? (Section 22.5)