title: Ultrastructure of Rhizobium-induced infection threads in clover root hairs.
abstract: Ultrastructural studies of Rhizobium-induced infection threads in clover root hairs show that the infection thread is initiated by an invagination process. Root hair wall growth is redirected at a localized point, resulting in the formation of an open pore. There is no direct penetration through the wall, and the bacteria remain extracellular within the root hair.
mesh_terms: D010944:Plants / Q000382:microbiology* / Q000648:ultrastructure; D012231:Rhizobium / Q000254:growth & development / Q000648:ultrastructure*; D012988:Soil Microbiology; D013559:Symbiosis