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Author Huang P., Yoshida H., Yano K., Kinoshita S., Kawai K., Koketsu E., Hattori M., Takehara S., Huang J., Hirano K., Ordonio R.L., Matsuoka M., Ueguchi-Tanaka M.
Title OsIDD2, a zinc finger and INDETERMINATE DOMAIN protein, regulates secondary cell wall formation.
Abstract:
Previously, we found 123 transcription factors (TFs) as candidate regulators of secondary cell wall (SCW) formation in rice by using phylogenetic and co-expression network analyses. Among them, we examined in this work the role of OsIDD2, a zinc finger and indeterminate domain (IDD) family TF. Its overexpressors showed dwarfism, fragile leaves, and decreased lignin content, which are typical phenotypes of plants defective in SCW formation, whereas its knockout plants showed slightly increased lignin content. The RNA-seq and quantitative reverse transcription polymerase chain reaction analyses confirmed that some lignin biosynthetic genes were downregulated in the OsIDD2-overexpressing plants, and revealed the same case for other genes involved in cellulose synthesis and sucrose metabolism. The transient expression assay using rice protoplasts revealed that OsIDD2 negatively regulates the transcription of genes involved in lignin biosynthesis, cinnamyl alcohol dehydrogenase 2 and 3 (CAD2 and 3), and sucrose metabolism, sucrose synthase 5 (SUS5), whereas an AlphaScreen assay, which can detect the interaction between TFs and their target DNA sequences, directly confirmed the interaction between OsIDD2 and the target sequences located in the promoter regions of CAD2 and CAD3. Based on these observations, we conclude that OsIDD2 is negatively involved in SCW formation and other biological events by downregulating its target genes.
Journal J Integr Plant Biol
Country Japan
Volume
Pages
Year 2017
PubMed ID 28574161
PubMed Central ID -
DOI 10.1111/jipb.12557
URL -
Relation
Gene BC6 BC7 CAD3 CESA7 GH2 RSUS5 _
INSD -
Strain Wild Core Collection -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
-
Stages in Each Organ
- Muant Lines (Gene)
-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase