@article{fdi:010052962,
  title = {{C}oncentration of beta-ecydisone (20{E}) in susceptible and resistant accessions of {P}faffia glomerata infected with {M}eloidogyne incognita and histological characterisation of resistance},
  author = {{G}omes, {A}. {C}. {M}. {M}. and {N}icole, {M}ichel and {M}attos, {J}. {K}. and {P}ereira, {S}. {I}. {V}. and {P}ereira, {P}. and {S}ilva, {D}. {B}. and {V}ieira, {R}. and {C}apdeville de, {G}. and {M}oita, {A}. {W}. and {C}arneiro, {R}. {M}. {D}. {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}faffia glomerata is a medicinal plant widely distributed in {B}razil, which is considered the world's greatest supplier of {P} glomerata roots. {A}mong active ingredients contained in this plant, the steroid beta-ecydisone (20{E}) is the most important compound extracted from roots. {T}his steroid presents therapeutic properties for the treatment of diabetes and haemorrhoids, besides having bioenergy, tonic and aphrodisiac effects. {T}he root-knot nematode {M}eloidogyne spp. is a major limiting factor in root production. {R}ecent studies showed resistance of accessions of {P}. glomerata to {M}eloidogyne incognita. {T}he aims of this work were: i) to correlate the concentration of 20{E} with resistance and susceptibility of {P}. glomerata accessions to {M}. incognita in inoculated and non-inoculated plants; ii) to study the effect of the parasitism of {M}. incognita on the concentration of the steroid 20{E} in the roots; and iii) to clarify resistance mechanisms by comparing the response of a highly resistant {UFV} with a highly susceptible accession ({F}arm) to nematode infection. {T}he concentration of 20{E} in the healthy susceptible {F}arm accession was significantly higher than in the healthy resistant {UFV} accession, showing that the resistance mechanism was not related to 20{E} concentrations. {P}lants of the {F}arm accession infected with {M}. incognita showed higher levels of 20{E} than the non-infected control. {A} positive and significant {P}earson correlation coefficient was observed between 20{E} concentrations and gall indexes. {R}esistance of {UFV} to the root-knot nematode {M}. incognita was associated with unidentified factors that limited nematode penetration or emigration of second-stage juveniles and with post-penetration responses, including the hypersensitive response. {G}iant cells were sometimes found in the resistant cultivar, but displayed a highly vacuolated and degraded cytoplasm with thinner cell walls than those induced in the susceptible accession. {M}icroscope observations under {UV} light showed a strong autofluorescence, suggesting that phenolic compounds may be involved in ginseng {UFV} resistance.},
  keywords = {autofluorescence ; {B}razilian ginseng ; hypersensitive reaction ; resistance ; phenolic compounds ; root-knot nematodes},
  booktitle = {},
  journal = {{N}ematology},
  volume = {12},
  numero = {{P}art 5},
  pages = {701--709},
  ISSN = {1388-5545},
  year = {2010},
  DOI = {10.1163/138855409x12597616267771},
  URL = {https://www.documentation.ird.fr/hor/fdi:010052962},
}