Abstract
The maize (Zea mays L.) CRINKLY4 (CR4) gene encodes a serine/threonine receptor-like kinase that controls an array of developmental processes in the plant and endosperm. The Arabidopsis thaliana (L.) Heynh. genome encodes an ortholog of CR4, ACR4, and four CRINKLY4-RELATED (CRR) proteins: AtCRR1, AtCRR2, AtCRR3 and AtCRK1. The available genome sequence of rice (Oryza sativa L.) encodes a CR4 ortholog, OsCR4, and four CRR proteins: OsCRR1, OsCRR2, OsCRR3 and OsCRR4, not necessarily orthologous to the Arabidopsis CRRs. A phylogenetic study showed that AtCRR1 and AtCRR2 form a clade closest to the CR4 group while all the other CRRs form a separate cluster. The five Arabidopsis genes are differentially expressed in various tissues. A construct formed by fusion of the ACR4 promoter and the GUS reporter, ACR4::GUS, is expressed primarily in developing tissues of the shoot. The ACR4 cytoplasmic domain functions in vitro as a serine/threonine kinase, while the AtCRR1 and AtCRR2 kinases are not active. The ability of ACR4 to phosphorylate AtCRR2 suggests that they might function in the same signal transduction pathway. T-DNA insertions were obtained in ACR4, AtCRR1, AtCRR2, AtCRR3 and AtCRK1. Mutations in acr4 show a phenotype restricted to the integuments and seed coat, suggesting that Arabidopsis might contain a redundant function that is lacking in maize. The lack of obvious mutant phenotypes in the crr mutants indicates they are not required for the hypothetical redundant function.
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Abbreviations
- CR4 :
-
CRINKLY4
- CRR :
-
CRINKLY4-RELATED
- GST :
-
Glutathione S-transferase
- GUS :
-
β-Glucuronidase
- RCC1 :
-
Regulator of chromosome condensation 1
- RLK :
-
Receptor-like kinase
- SAM :
-
Shoot apical meristem
- TNFR :
-
Tumor necrosis factor receptor
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Acknowledgements
The authors thank the Becraft lab for discussions and critical reading of the manuscript. We are grateful to Syngenta and Torrey Mesa Research Institute for providing T-DNA mutants and access to their rice genomic sequence, Frans Tax and the Functional Genomics of Plant Phosphorylation project for screening for a T-DNA mutant, the Salk Institute Genomic Analysis Laboratory and the Arabidopsis Biological Resource Center for providing T-DNA mutant seeds, and the Bessey Microscopy Facility at Iowa State University for technical assistance and sample preparation. This research was funded by grants DE-FG02-98ER20303 from the U.S. DOE Energy Biosciences and IBN:96-04426 from the U.S. National Science Foundation to P.W.B., and by grant No. R01-2000-000-00195-0 from the Basic Research Program of the Korea Science & Engineering Foundation to S-G.S.
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Cao, X., Li, K., Suh, SG. et al. Molecular analysis of the CRINKLY4 gene family in Arabidopsis thaliana. Planta 220, 645–657 (2005). https://doi.org/10.1007/s00425-004-1378-3
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DOI: https://doi.org/10.1007/s00425-004-1378-3