Abstract
The lima bean (Phaseolus lunatus L.) and the pole bean (Phaseolus vulgaris L.) are nodulated by rhizobia of two different cross-inoculation groups. Rhizobium sp. 127E15, a cowpea-type Rhizobium, can induce effective nodules on the lima bean and partially effective nodules on the pole bean. Rhizobium phaseoli 127K14 can induce effective nodules on the pole bean but does not reciprocally nodulate the lima bean. Root hairs of the lima bean when inoculated with Rhizobium sp. 127E15 showed tip curling and swelling and infection thread formation as observed by light microscopy and scanning electron microscopy. When lima bean root hairs were inoculated with R. phaseoli 127K14, no host-specific responses were observed. Pole bean root hairs that had been inoculated with R. phaseoli 127K14 or Rhizobium sp. 127E15 also showed tip curling and swelling and infection thread formation. Colonization of lima bean root hairs by Rhizobium sp. 127E15 and pole bean root hairs by R. phaseoli 127K14 or Rhizobium sp. 127E15 appeared to involve the elaboration of microfibrils. This study showed that when Rhizobium sp. 127E15 nodulates a host of a different cross-inoculation group, it elicits the same specific host responses as it does from a host of the same cross-inoculation group.
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