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Identification and Expression of Floral Organ Homeotic Genes from Alpinia oblongifolia (Zingiberaceae)
Author(s) -
Xia YongMei,
Gao XueMei,
Li QingJun
Publication year - 2009
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/j.1744-7909.2008.00782.x
Subject(s) - homeotic gene , biology , gene , genetics , homologous chromosome , evolutionary biology , gene expression
Current understanding of the classical ABC model of floral development has provided a new set of characters to evaluate floral evolution. However, what is still lacking is a clear assessment of this genetic program across monocots. Here, to investigate the evolution of members of class A and B genes in monocots, we report the sequence characteristic and transcript expression of three new MADS‐box genes in Alpinia oblongifolia Hayata. Sequence and phylogenetic analysis reveals that these genes are FUL ‐like and AP3 ‐like. Therefore, they were termed AoFL1 , AoFL2 and AoAP3 . AoFL1 contains the FUL motif, but AoFL2 lacks this motif. Their expression revealed by in situ hybridization may reflect the ancestral function of FUL ‐like genes in the specification of inflorescence and floral meristems. The AoAP3 gene contains two conserved motifs, the PI ‐derived and paleo AP3 motifs. The AoAP3 transcripts located to the corolla and stamen, and hybridization signals were detected in the central whorl. These expression patterns suggest that the functions of homologous organ identity genes are diversified in A. oblongifolia . The implications of these findings on the conservation of homologous gene function are discussed.