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6 matches found in 2 documents. Search time: 0.001 seconds.
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Score: 6.00
Title: Isolation and characterization of a rice WUSCHEL-type homeobox gene that is specifically expressed in the central cells of a quiescent center in the root apical meristem .
Author: Kamiya N Nagasaki H Morikami A Sato Y Matsuoka M
Journal: Plant J Citation: V : 35 ( 4 ) P : 429-41 Year: 2003 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub12904206 Accession (PMID): 12904206
Abstract: The Arabidopsis WUSCHEL ( WUS ) protein , which plays an important role in the specification of the stem cells in the shoot apical meristem ( SAM ) , contains an atypical homeodomain ( HD ) with extra residues in its loop and turn regions . We speculated that a WUS-type atypical HD protein might also be involved in the specification and maintenance of the root apical meristem ( RAM ) stem cells of rice . To investigate this possibility , we isolated and characterized a rice WUS-type homeobox gene designated quiescent-center-specific homeobox ( QHB ) gene . Using transformants carrying the QHB promoter-GUS and in situ hybridization , we found that QHB was specifically expressed in the central cells of a quiescent center ( QC ) of the root . During embryogenesis and crown root formation , QHB expression was observed prior to the morphological differentiation of the root . However , we detected different QHB expression patterns in the process of the RAM development , specifically between radicle and crown root formation , suggesting that the cell-fate determination of the QC may be controlled by different mechanisms . We also produced transformants that overexpress QHB or Arabidopsis WUS . These transformants did not form crown roots , but developed multiple shoots from ectopic SAMs with malformed leaves . On the basis of these observations , we propose that the WUS-type homeobox gene is involved in the specification and maintenance of the stem cells ( QC cells ) in the RAM , by a mechanism similar to that for WUS in the SAM .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: OsIAA23-mediated auxin signaling defines postembryonic maintenance of QC in rice .
Author: Jun N Gaohang W Zhenxing Z Huanhuan Z Yunrong W Ping W
Journal: Plant J Citation: V : 68 P : 433-42 Year: 2011 Type: In-Process
Literature: oryza Field: abstract Doc ID: pub21736653 Accession (PMID): 21736653
Abstract: Although the quiescent center ( QC ) is crucial to root development , the molecular mechanisms that regulate its postembryonic maintenance remain obscure . In this study , a semi-dominant mutant that exhibits pleiotropic defects in root it issues , which includes the root cap , lateral and crown roots , was isolated . The mutant is characterized by a loss of QC identity during postembryonic development , and the displayed defects result from a stabilizing mutation in domain II of OsIAA23 ( Os06g39590 ) . Expression of OsIAA23 is specific to the QC of the root tip during the development of primary , lateral and crown roots . Consistent with OsIAA23 expression in the QC , the auxin signaling marked by DR5p : : GUS ( ss-glucuronidase ) was absent in the QC region of Osiaa23 . Transgenic rice plants harboring Osiaa23 under the control of the QHB promoter mimic partially the defects of Osiaa23 . These results indicate that the maintenance of the QC is dependent on OsIAA23-mediated auxin signaling in the QC . These findings provide insight into Aux/IAA-based auxin signaling during postembryonic maintenance of the QC in plants .
Supplemental links/files: reference in endnote online text related articles pubmed citation

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