Memorias de investigación
Artículos en revistas:
MicroRNA399 is a phloem-mobile signal reporting phosphate status between plant organs
Año:2008
Áreas de investigación
  • Biología molecular
Datos
Descripción
The presence of microRNA species in plant phloem sap suggests potential signaling roles by long-distance regulation of gene expression. Proof for such a role for a phloem-mobile microRNA is lacking. Here we show that phosphate (Pi) starvation-induced microRNA399 (miR399) is present in the phloem sap of two diverse plant species, rapeseed and pumpkin, and levels are strongly and specifically increased in phloem sap during Pi deprivation. By performing micro-grafting experiments using Arabidopsis, we further show that chimeric plants constitutively over-expressing miR399 in the shoot accumulate mature miR399 species to very high levels in their wild-type roots, while corresponding primary transcripts are virtually absent in roots, demonstrating shoot-to-root transport. The chimeric plants exhibit (i) down-regulation of the miR399 target transcript (PHO2), which encodes a critical component for maintenance of Pi homeostasis, in the wild-type root, and (ii) Pi accumulation in the shoot, which is the phenotype of pho2 mutants, miR399 over-expressers or chimeric plants with a genetic knock-out of PHO2 in the root. Hence the transported miR399 molecules retain biological activity. This is a demonstration of systemic control of a biological process, i.e. maintenance of plant Pi homeostasis, by a phloem-mobile microRNA.
Internacional
Si
JCR del ISI
Si
Título de la revista
PLANT JOURNAL
ISSN
0960-7412
Factor de impacto JCR
6,751
Información de impacto
Volumen
53
DOI
Número de revista
0
Desde la página
731
Hasta la página
738
Mes
ENERO
Ranking
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Participantes
  • Participante: W. Scheible,
  • Participante: A., Buhtz,
  • Autor: Julia Kehr . UPM
  • Participante: B.D Pant,
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: Centro de Biotecnología y Genómica de Plantas, CBGP