IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
capítulos de libros
Título:
Nitric Oxide as a signal molecule in intra- and extra-cellular bacteria-plant interactions
Autor/es:
PALMA, A. A.; LORENZO LAMATTINA; CREUS, C.
Libro:
Nitrogen cycle in soil and environment
Editorial:
Wiley
Referencias:
Lugar: No Informado; Año: 2010; p. 397 - 420
Resumen:
All plants live in intimate association with many microorganisms. These microorganisms colonize
the surfaces, the intercellular spaces within tissues or even the inside of plant cells
(Brencic and Winans, 2005). Some of the most complex interactions that terrestrial plants
experience occur between the roots and their surrounding environment (Bais et al., 2006). It is
precisely in the soil where these interactions are subjected to a plethora of conditions that
determine the success or failure of root colonization, leading to effects on plant developmental
processes.
Soil has been divided into three main zones according proximity to the root: (1) rhizoplane
or the root surface, (2) rhizosphere or the soil under root influence, and (3) bulk soil (Manthey
et al., 1994). Bacteria that inhabit soils can affect plant growth and development. The interactions
they establish with roots vary from beneficial, deleterious, or neutral effects on plants
(Hirsch et al., 2003).
The distribution of microorganisms in the rhizosphere can be classified into four main categories
related to root proximity and intimacy: (1) bacteria living in the soil near roots, using
metabolites leaked from roots as carbon (C) and N sources, (2) bacteria colonizing the
rhizoplane, (3) bacteria residing in root tissue, inhabiting spaces between cortical cells, and
(4) bacteria living inside cells in specialized root structures or nodules (Gray and Smith, 2005).
The latter are generally represented by two groups: the legume-rhizobia and the woody plant-
Frankia associations (Hallman et al., 1997; Gray et al., 2005). A more simple and convenient
classification based on the preferred colonizing site is proposed by Gray and Smith (2005)
dividing plant growth-promoting rhizobacteria (PGPR) into extracellular PGPR (ePGPR), and
intracellular PGPR (iPGPR), the latter existing inside root cells generally in specialized nodular
structures.
classification based on the preferred colonizing site is proposed by Gray and Smith (2005)
dividing plant growth-promoting rhizobacteria (PGPR) into extracellular PGPR (ePGPR), and
intracellular PGPR (iPGPR), the latter existing inside root cells generally in specialized nodular
structures.
associations (Hallman et al., 1997; Gray et al., 2005). A more simple and convenient
classification based on the preferred colonizing site is proposed by Gray and Smith (2005)
dividing plant growth-promoting rhizobacteria (PGPR) into extracellular PGPR (ePGPR), and
intracellular PGPR (iPGPR), the latter existing inside root cells generally in specialized nodular
structures.