Class 1 KNOX Gene Expression Supports the Selaginella Rhizophore Concept

• Published in: Journal of plant biology = Singmul Hakhoe chi Vol. 53; no. 4; pp. 268 - 274
• Main Authors: Kawai, Junko, University of Tokyo, Tokyo, Japan, Tanabe, Yoichi, University of Tokyo, Tokyo, Japan, Soma, Sumitomo, Chiba University, Chiba, Japan, Ito, Motomi, University of Tokyo, Tokyo, Japan
• Format: Journal Article
• Language: English
• Published: New York Springer-Verlag 01.08.2010; Springer Nature B.V; 한국식물학회
• Subjects: Artificial chromosomes; Axial organ; Biomedical and Life Sciences; Cloning; EXPRESION GENICA; EXPRESSION DES GENES; Ferns; Firing pattern; Flowers & plants; GENE EXPRESSION; Hybridization; KNOX gene; Leaves; Life Sciences; Lycophyte; Microphyll; Original Research; Phylogenetics; Plant Breeding/Biotechnology; Plant Ecology; Plant Genetics and Genomics; Plant Sciences; Plant Systematics/Taxonomy/Biogeography; Rhizophore; RNA polymerase; Selaginella; Spikemoss; 생물학; Spikemoss; Lycophyte; Microphyll; Class 1 KNOX; Rhizophore
• ISSN: 1226-9239; 1867-0725
• DOI: 10.1007/s12374-010-9113-z

The spikemoss is marked by the unique root-producing pleurogeous rhizophore as well as the lycophytic microphyll. Imaichi and Kato (Bot Mag Tokyo 102:369-380, 1989; Am J Bot 78:1694-1703, 1991) revealed that the exogenous developmental process in the rhizophore is clearly distinguishable from the developmental process in the endogenous root, argued that the axial organ could be coordinate with other fundamental organs including the root and stem, and demonstrated the "rhizophore concept." In this paper, we report on the expression pattern of the spikemoss Selaginella class 1 KNOX gene, SuKNOX1, in the rhizophore. We show that the SuKNOX1 mRNA is specifically accumulated at the tip of the rhizophore as well as the shoot apical apex, but not in the root tip. This result supports the "rhizophore concept" at the molecular level.