Organization of the chromosome region harboring a FLORICAULA/LEAFY gene in Liriodendron |
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| Authors: | Haiying Liang Abdelali Barakat Scott E. Schlarbaum John E. Carlson |
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| Affiliation: | (1) Present address: Department of Genetics and Biochemistry, Clemson University, 100 Jordan Hall, Clemson, SC 29634, USA;(2) School of Forest Resources and Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA;(3) Department of Forestry, Wildlife & Fisheries, Institute of Agriculture, The University of Tennessee, Knoxville, TN 37996-4563, USA;(4) The Department of Bioenergy Science and Technology (WCU), Chonnam National University, 333 Yongbongro, Buk-Gu, Gwangju, 500-757, South Korea |
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| Abstract: | FLORICAULA/LEAFY (FLO/LFY) plays an important role in the reproductive transition and controls flower spatial patterning by inducing the expression of the ABC floral organ identity genes. In this study, we sequenced two bacterial artificial chromosomes harboring a FLO/LFY and three other genes from yellow-poplar (Liriodendron tulipifera L.) and compared the gene order in this locus between several species. Besides the conserved terminal domains, key residues involved in interactions with DNA bases, backbone, and in dimerization were also conserved in the yellow-poplar FLO/LFY. Phylogenetic analysis of the FLO/LFY amino acid sequences placed yellow-poplar closer to eudicots than to monocotyledonous species. We found that gene content and order in this region of the yellow-poplar genome was more similar to corresponding regions in Vitis vinifera L., Carica papaya L., Populus trichocarpa Torr. & Gray, and Ricinus communis L., regardless of the evolutionary relationship. In addition, evidence for transposition, large insertions, and duplications were found, suggesting multiple and complex mechanisms of basal angiosperm genome evolution. |
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