QHB,OsQHB,OsWOX5

2015-01-20 | Categories genes  | Tags crown  root  crown root  development  grain  grain length  panicle  tiller  salt  tolerance  salt tolerance  salt stress  stress  plant height  tiller number  grain width  panicle length  reactive oxygen species  shoot  callus 

• Information
  • Symbol: QHB,OsQHB,OsWOX5
  • MSU: LOC_Os01g63510
  • RAPdb: Os01g0854500
• Publication
  • 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, 2003, The Plant Journal.
  • Transcriptome comparison between pluripotent and non-pluripotent calli derived from mature rice seeds, 2020, Sci Rep.
  • OsQHB Improves Salt Tolerance by Scavenging Reactive Oxygen Species in Rice., 2022, Front Plant Sci.
  • Ectopic expression of WOX5 promotes cytokinin signaling and de novo shoot regeneration., 2022, Plant Cell Rep.
• Genbank accession number
  • AK102203
• Key message
  • 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
  • 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
  • Thus, our findings provide new insights into the role of rice WOX gene family in rice development and salt tolerance, and suggest that OsQHB is a valuable target for improving rice production in environments characterized by salt stress
  • Mutation in OsQHB led to a decrease in plant height, tiller number, panicle length, grain length and grain width, and an increase in salt tolerance
  • OsQHB Improves Salt Tolerance by Scavenging Reactive Oxygen Species in Rice.
  • Moreover, the osqhb mutants have higher ROS-scavenging enzymes activities and lower accumulation of ROS and malondialdehyde (MDA) under salt stress
  • Transcriptome and qPCR analysis showed that reactive oxygen species (ROS) scavenging-related genes were regulated by OsQHB
  • The function of WOX5 in enhancing cytokinin-dependent shoot regeneration is evolutionarily conserved, as conditional overexpression of OsWOX5 on SIM profoundly enhanced shoot regeneration in rice callus
• Connection
  • CRL1~ARL1, QHB~OsQHB~OsWOX5, Identification of CROWN ROOTLESS1-regulated genes in rice reveals specific and conserved elements of postembryonic root formation., We show that CRL1 positively regulates 277 genes, including key genes involved in meristem patterning (such as QUIESCENT-CENTER SPECIFIC HOMEOBOX; QHB), cell proliferation and hormone homeostasis

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