H2O2 is required for optimal establishment of the Medicago sativa/Sinorhizobium meliloti symbiosis.

@article{Jamet2007H2O2IR,
  title={H2O2 is required for optimal establishment of the Medicago sativa/Sinorhizobium meliloti symbiosis.},
  author={Alexandre Jamet and Karine Mandon and Alain Puppo and Didier H{\'e}rouart},
  journal={Journal of bacteriology},
  year={2007},
  volume={189 23},
  pages={8741-5}
}
The symbiotic interaction between Medicago sativa and Sinorhizobium meliloti RmkatB(++) overexpressing the housekeeping catalase katB is delayed, and this delay is combined with an enlargement of infection threads. This result provides evidence that H(2)O(2) is required for optimal progression of infection threads through the root hairs and plant cell layers.