title: Induction of a homeodomain-leucine zipper gene by auxin is inhibited by cytokinin in Arabidopsis roots.
abstract: Homeobox genes are essential regulators of the development of plants as well as other organisms. We chose eight putative Arabidopsis homeobox genes not previously characterized and examined their expression in response to treatment with auxin/cytokinin. One of them, ATHB53, was further studied because it was auxin-inducible and its induction was inhibited by cytokinin. Its full-length cDNA was cloned and found to encode a protein of the HD-Zip superfamily. Whole-mount in situ hybridization and RT-PCR showed that it was expressed in the root meristem, and auxin treatment increased its expression, especially in a region from 0.3 to 0.6mm from the root tip. These results suggest that ATHB53 plays a regulatory role in auxin/cytokinin signaling during root development.
authors.affiliation: Department of Biological Science, Sookmyung Women's University, Seoul, Republic of Korea.
authors.forename: Ora
authors.initials: O
authors.lastname: Son
authors.forename: Hee-Yeon
authors.initials: HY
authors.lastname: Cho
authors.forename: Mi-Ran
authors.initials: MR
authors.lastname: Kim
authors.forename: Hyosoo
authors.initials: H
authors.lastname: Lee
authors.forename: Myeong-Sok
authors.initials: MS
authors.lastname: Lee
authors.forename: Eunsook
authors.initials: E
authors.lastname: Song
authors.forename: Jong Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Kyung Hee
authors.initials: KH
authors.lastname: Nam
authors.forename: Jong-Yoon
authors.initials: JY
authors.lastname: Chun
authors.forename: Ho-Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Soon-Kwan
authors.initials: SK
authors.lastname: Hong
authors.forename: Yong-Yoon
authors.initials: YY
authors.lastname: Chung
authors.forename: Cheol-Goo
authors.initials: CG
authors.lastname: Hur
authors.forename: Hyung-Taeg
authors.initials: HT
authors.lastname: Cho
authors.forename: Choong-Ill
authors.initials: CI
authors.lastname: Cheon
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000378:metabolism*; D001483:Base Sequence; D003583:Cytokinins / Q000494:pharmacology*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D018398:Homeodomain Proteins / Q000737:chemistry / Q000378:metabolism*; D007210:Indoleacetic Acids / Q000494:pharmacology*; D016350:Leucine Zippers / Q000502:physiology; D008969:Molecular Sequence Data; D018517:Plant Roots / Q000187:drug effects* / Q000378:metabolism*
chemical_list: D003583:Cytokinins; D018398:Homeodomain Proteins; D007210:Indoleacetic Acids