title: Identification of genes expressed in maize root cortical cells during lysigenous aerenchyma formation using laser microdissection and microarray analyses.
abstract: • To adapt to waterlogging in soil, some gramineous plants, such as maize (Zea mays), form lysigenous aerenchyma in the root cortex. Ethylene, which is accumulated during waterlogging, promotes aerenchyma formation. However, the molecular mechanism of aerenchyma formation is not understood. • The aim of this study was to identify aerenchyma formation-associated genes expressed in maize roots as a basis for understanding the molecular mechanism of aerenchyma formation. Maize plants were grown under waterlogged conditions, with or without pretreatment with an ethylene perception inhibitor 1-methylcyclopropene (1-MCP), or under aerobic conditions. Cortical cells were isolated by laser microdissection and their mRNA levels were examined with a microarray. • The microarray analysis revealed 575 genes in the cortical cells, whose expression was either up-regulated or down-regulated under waterlogged conditions and whose induction or repression was suppressed by pretreatment with 1-MCP. • The differentially expressed genes included genes related to the generation or scavenging of reactive oxygen species, Ca(2+) signaling, and cell wall loosening and degradation. The results of this study should lead to a better understanding of the mechanism of root lysigenous aerenchyma formation.
authors.affiliation: Graduate School of Agriculture and Life Sciences, University of Tokyo, Tokyo, Japan.
authors.forename: Imene
authors.initials: I
authors.lastname: Rajhi
authors.forename: Takaki
authors.initials: T
authors.lastname: Yamauchi
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Shunsaku
authors.initials: S
authors.lastname: Nishiuchi
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Shiono
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Watanabe
authors.forename: Ahmed
authors.initials: A
authors.lastname: Mliki
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nagamura
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Tsutsumi
authors.forename: Naoko K
authors.initials: NK
authors.lastname: Nishizawa
authors.forename: Mikio
authors.initials: M
authors.lastname: Nakazono
mesh_terms: D020013:Calcium Signaling / Q000235:genetics; D002473:Cell Wall / Q000235:genetics; D015536:Down-Regulation / Q000235:genetics; D016166:Free Radical Scavengers / Q000378:metabolism; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000235:genetics; D007834:Lasers; D042282:Microdissection; D005810:Multigene Family; D020411:Oligonucleotide Array Sequence Analysis; D009928:Organ Specificity / Q000235:genetics; D016612:Paraffin Embedding; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000033:anatomy & histology / Q000166:cytology* / Q000201:enzymology / Q000235:genetics*; D017382:Reactive Oxygen Species / Q000378:metabolism; D015203:Reproducibility of Results; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015854:Up-Regulation / Q000235:genetics; D003313:Zea mays / Q000033:anatomy & histology / Q000166:cytology / Q000201:enzymology / Q000235:genetics*
chemical_list: D016166:Free Radical Scavengers; D010940:Plant Proteins; D017382:Reactive Oxygen Species