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All of the following statements concerning actinomycetous filamentous soil bacterium Frankia are correct except that Frankia: Can induce root nodules in many plant species Cannot fix nitrogen in free living state Cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hapanoids. Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex. Do explain your answer.

All of the following statements concerning actinomycetous filamentous soil bacterium Frankia are correct except that Frankia:
  1. Can induce root nodules in many plant species
  2. Cannot fix nitrogen in free living state
  3. Cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hapanoids.
  4. Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex.
Do explain your answer.

Grade:12th pass

1 Answers

Arun
25750 Points
4 years ago
Frankia, aerobic Gram-positive actinomycetes can induce root nodules in about 8 families. These bacteria cannot fix nitrogen in free living state. They can infect the host root by intracellularly by infecting curled root hair or intercellularly by penetrating between two rhizoderm cells and then progress toward cortical cells. These bacteria in free-living state form diazovesicles containing nitrogenase which is protected from oxygen by a series of laminated lipid layers.
So all the statements are correct.

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