Nitric oxide signaling by plant-associated bacteria

COHEN, M. F.; LAMATTINA, L.; YAMASAKI, H.

Nitric oxide: our emerging underststanding of a plant hormone

Wiley

Lugar: Germany; Año: 2009; p. 1 - 1

  The primary source of biogenic NO [in the biosphere(?)] is energy metabolism within nitrifying and denitrifying bacteria, which are common inhabitants of the rhizosphere. NO produced by these bacteria regulates their mobility and gene expression and can elicit responses in neighboring organisms, including plants. Many other bacteria employ bacterial nitric oxide synthase (bNOS) to generate NO. One clear function for bNOS is in oxidative defense signaling. An endophytic association of actinomycetes and other bNOS-containing bacteria, some of which may be vertically transmitted within seeds, has been demonstrated among diverse plant species. Actinomycetes possessing bNOS activity display increased capacity for rhizosphere colonization and two species have been shown to upregulate bNOS activity in response to plant-