IBR   13079
INSTITUTO DE BIOLOGIA MOLECULAR Y CELULAR DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
MBF1s regulate ABA-dependent germination of Arabidopsis seeds
Autor/es:
DI MAURO MF; IGLESIAS MJ; ARCE DP; VALLE EM; BENECH ARNOLD R; TSUDA K; YAMAZAKI KI; CASALONGUÉ CA; GODOY AV
Revista:
Plant Signalling and behaviour
Editorial:
Landes Bioscience
Referencias:
Lugar: Austin; Año: 2012 vol. 7 p. 188 - 192
ISSN:
1559-2316
Resumen:
Transcriptional co-activators of the multiprotein bridging factor 1 (MBF1) controls gene expression by connectingtranscription factors and the basal transcription machinery. In Arabidopsis thaliana functions of MBF1 genes have beenrelated to stress tolerance and developmental alterations. Endogenous ABA plays a major role in the regulation ofArabidopsis seed dormancy and germination. Seed dormancy and ABA sensitivity are enhanced in ethylene insensitivemutants suggesting that ethylene signal transduction pathway is necessary to fully develop ABA-dependentgermination. In this report we showed that a triple knock-down mutant for Arabidopsis MBF1 genes (abc-) hasenhanced seed dormancy and displays hypersensitivity to exogenous ABA. In addition, higher ABA contents weredetected in abc- seeds after imbibition. These evidences suggest a negative role of MBF1s genes in ABA-dependentinhibition of germination. The participation of MBF1s in ethylene signal transduction pathway is also discussed.