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Real-Time Detection of Reactive Oxygen Species Production in Immune Response in Rice with a Chemiluminescence Assay
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Rice ( Oryza) hemoglobins.

Raúl Arredondo-Peter1, Jose F Moran2, Gautam Sarath3

  • 1Laboratorio de Biofísica y Biología Molecular, Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, 62210, Mexico.

F1000Research
|February 10, 2015
PubMed
Summary
This summary is machine-generated.

Rice hemoglobins (Hbs), including non-symbiotic (nsHb) and truncated (tHb) types, have diverse molecular structures and oxygen affinities. Further research is needed to fully understand their functions and evolution in rice.

Keywords:
Evolutionfunctiongene expressionnon-symbioticstructuresymbiotictruncated

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Area of Science:

  • Plant molecular biology
  • Biochemistry
  • Evolutionary biology

Background:

  • Rice (Oryza) possesses non-symbiotic (nsHb) and truncated (tHb) hemoglobins.
  • These hemoglobins are found across different rice varieties (indica and japonica).

Purpose of the Study:

  • To review current findings on rice hemoglobins.
  • To elucidate their molecular, structural, and evolutionary aspects.
  • To identify knowledge gaps in understanding rice Hb functions.

Main Methods:

  • Molecular characterization of nsHb and tHb genes in rice.
  • Structural analysis through crystal structure elucidation and modeling.
  • Kinetic analysis of oxygen binding affinity.
  • Comparative analysis with other plant and non-plant hemoglobins.
  • Evolutionary lineage tracing of rice Hb genes.

Main Results:

  • Rice has five nsHb genes (hb1-hb5) and one tHb gene.
  • Hb transcripts and polypeptides are present in various rice organs and differentiating cells.
  • Rice Hb1 crystal structure is known; others are modeled.
  • High O2 affinity in Hb1, Hb2, and possibly Hb3, Hb4; lower affinity in Hb5 and tHb.
  • Rice nsHb and tHb genes evolved vertically under neutral selection.
  • Potential roles include O2 transport, sensing, NO-scavenging, and redox signaling.

Conclusions:

  • Rice hemoglobins exhibit diverse molecular properties and potential functions.
  • Significant gaps exist in understanding their precise roles, modeled properties, gene regulation, and evolutionary nuances.
  • Further experimental validation is crucial for a comprehensive understanding.