Microorganismos Solubilizadores Defosforo

The Plant Cell, Vol. 24: 3855, October 2012, www.plantcell.org ã 2012 American Society of Plant Biologists. All rights reserved.

IN BRIEF

Pumping Iron: Conserved Iron Deficiency Responses
inthe Plant Lineage
Iron is an essential nutrient that functions
as a catalyst for many cellular reactions,
in particular those involving redox and O2
chemistry (reviewed in Briat et al., 2007;
Jeongand Guerinot, 2009). For example,
iron-containing proteins play key roles in
the electron transport reactions of photosynthesis and respiration, and iron is also
an important element in thenutritional quality
of plant products. Many organisms are
chronically undernourished for iron, as
evidenced by the prevalence of anemia
worldwide and iron limitation in crops and
in ocean ecosystems.In large part, this
limitation is due to the relative insolubility of
the Fe(III) oxidation state, and most organisms have complicated iron uptake and
metabolism pathways that involve multiplesteps of chelation and redox chemistry.
Chlamydomonas reinhardtii is a useful
model system for understanding iron metabolism and the impact of poor iron nutrition
in plants. Urzica et al. (pages3921–3948)
present a large-scale study that examines
the effect of iron limitation on the transcriptome and proteome of C. reinhardtii.
The authors use RNA-Seq to analyze the
effect of low iron on thetranscriptome of C.
reinhardtii cells grown with CO2 (photoautotrophic) or acetate (photoheterotrophic)
as the carbon source. The study goes
beyond transcriptomics and presents proteomics data,bioinformatics analysis, and
additional experimentation, including measurement of metabolites and work with
Arabidopsis thaliana, to make new discoveries relevant to the maintenance of iron
homeostasisin the plant lineage.
The use of iron limitation in conjunction
with carbon source (either metabolism of
acetate or photosynthesis) provides new
and interesting information on how iron
affects...