title: Rice BRITTLE CULM 3 (BC3) encodes a classical dynamin OsDRP2B essential for proper secondary cell wall synthesis.
abstract: "Brittle culm" mutants found in Gramineae crops are suitable materials to study the mechanism of secondary cell wall formation. Through positional cloning, we have identified a gene responsible for the brittle culm phenotype in rice, brittle culm 3 (bc3). BC3 encodes a member of the classical dynamin protein family, a family known to function widely in membrane dynamics. The bc3 mutation resulted in reductions of 28-36% in cellulose contents in culms, leaves, and roots, while other cell wall components remained unaffected. Reductions of cell wall thickness and birefringence were observed in both fiber (sclerenchyma) and parenchymal cells, together with blurring of the wall's layered structures. From promoter-GUS analyses, it was suggested that BC3 expression is directly correlated with active secondary cell wall synthesis. These results suggest that BC3 is tightly involved in the synthesis of cellulose and is essential for proper secondary cell wall construction.
authors.affiliation: Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Hirano
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Kotake
authors.forename: Kumiko
authors.initials: K
authors.lastname: Kamihara
authors.forename: Kahori
authors.initials: K
authors.lastname: Tsuna
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Aohara
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takatsuji
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Tsumuraya
authors.forename: Shinji
authors.initials: S
authors.lastname: Kawasaki
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002473:Cell Wall / Q000378:metabolism*; D002482:Cellulose / Q000378:metabolism; D003001:Cloning, Molecular; D017931:DNA Primers; D017343:Genes, Plant; D017930:Genes, Reporter; D005966:Glucuronidase / Q000235:genetics; D008969:Molecular Sequence Data; D012275:Oryza / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics*; D011401:Promoter Regions, Genetic; D017386:Sequence Homology, Amino Acid
chemical_list: D017931:DNA Primers; D010940:Plant Proteins; D002482:Cellulose; D005966:Glucuronidase