Journal Article

Ancestral MADS Box Genes in Sugi, <i>Cryptomeria japonica</i> D. Don (Taxodiaceae), Homologous to the B Function Genes in Angiosperms

Mitsue Fukui, Norihiro Futamura, Yuzuru Mukai, Yunqiu Wang, Akinori Nagao and Kenji Shinohara

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 6, pages 566-575
Published in print June 2001 | ISSN: 0032-0781
Published online June 2001 | e-ISSN: 1471-9053 | DOI:
Ancestral MADS Box Genes in Sugi, Cryptomeria japonica D.
Don (Taxodiaceae), Homologous to the B Function Genes in

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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In flowering plants, flower organ identity is controlled by the ABC genes, including several MADS box genes. We present two MADS box genes of a conifer, Cryptomeria japonica D. Don. The genes, CjMADS1 and CjMADS2, were related to the angiosperm B function genes which determine the identities of petals and stamens. A phylogenetic analysis showed that these genes form a new clade outside the angiosperm B group, that is, PISTILLATA (PI) and APETALA3 (AP3) lineages. CjMADS1 had a PI-group specific motif and CjMADS2 had AP3-group specific motifs at the C terminal end, respectively. CjMADS1 was expressed in male strobili (or cones) throughout its development, while CjMADS2 was transiently expressed during male strobilus development. The specific expression in the male reproductive organ indicated that the B function is maintained in gymnosperms. Our cladistic analysis suggests that the gene duplication event which generated B function gene lineages predates the divergence of angiosperms and gymnosperms and that the gene duplication which produced the two genes of C. japonica occurred in an ancestral conifer species.

Keywords: Key words: B function — Conifer — Cryptomeria japonica — Gymnosperm — MADS box gene — Male strobilous development.; Abbreviation: RT, reverse transcription.

Journal Article.  6146 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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