title: Analysis of ascorbate peroxidase genes expressed in resistant and susceptible wheat lines infected by the cereal cyst nematode, Heterodera avenae.
abstract: Changes in ascorbate peroxidase (APX) enzyme activity in response to nematode (Heterodera avenae) attack were studied in roots of three hexaploid wheat lines carrying Cre2, Cre5, or Cre7 nematode resistance genes and the susceptible Triticum aestivum cv. Anza. A spectrophotometric analysis was carried out with root extracts of infected plants 4, 7, 11, and 14 days after nematode inoculation using uninfected plant as control. APX induction in infected resistant genotypes was similar and higher than in the susceptible control. The introgression wheat/Aegilops ventricosa H-93-8 line, carrying the Cre2 gene, and its parental line H-10-15 as susceptible control were used to analyze whether this increase of activity was correlated with the induction of APX gene expression. Genes encoding cytosolic forms of APX were induced in roots of both lines in response to nematode infection. This induction took place both earlier and with greater intensity in the resistant line than in the susceptible one, and it was also higher in the root area at the site of nematode attachment.
authors.affiliation: Departamento de Biotecnología, ETS Ing. Agrónomos, UPM, Madrid 28040, Spain.
authors.forename: Ester
authors.initials: E
authors.lastname: Simonetti
authors.forename: Eva
authors.initials: E
authors.lastname: Alba
authors.forename: María Jesús
authors.initials: MJ
authors.lastname: Montes
authors.forename: Angeles
authors.initials: A
authors.lastname: Delibes
authors.forename: Isidoro
authors.initials: I
authors.lastname: López-Braña
mesh_terms: D000818:Animals; D060387:Ascorbate Peroxidases; D018506:Gene Expression Regulation, Plant; D006790:Host-Parasite Interactions; D007113:Immunity, Innate; D010544:Peroxidases / Q000235:genetics / Q000378:metabolism*; D010935:Plant Diseases / Q000235:genetics* / Q000469:parasitology; D018517:Plant Roots / Q000201:enzymology / Q000235:genetics / Q000469:parasitology; D017382:Reactive Oxygen Species / Q000378:metabolism; D014908:Triticum / Q000201:enzymology* / Q000235:genetics / Q000469:parasitology; D014431:Tylenchoidea / Q000502:physiology*
chemical_list: D017382:Reactive Oxygen Species; D010544:Peroxidases; D060387:Ascorbate Peroxidases