Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15519
Title: Characterization of floral organ identity genes in Dendrobium crumenatum
Authors: XU YIFENG
Keywords: ABCDE model, flower development, functional divergence, gene duplication, orchid, floral organ identity
Issue Date: 15-Sep-2006
Source: XU YIFENG (2006-09-15). Characterization of floral organ identity genes in Dendrobium crumenatum. ScholarBank@NUS Repository.
Abstract: The ABCDE model was proposed as a general model to explain flower development in diverse plant groups. However, the extent to which this model is applicable to orchids is still unknown. To investigate the regulatory mechanisms underlying orchid flower development, we isolated AP2-, PI/GLO-, AP3/DEF-, AG- and SEP-like genes from Dendrobium crumenatum. These genes exhibited different expression patterns from their Arabidopsis orthologs. Functional studies showed that DcOPI and DcOAG1 could replace the functions of PI and AG in Arabidopsis, respectively. By using chimeric repressor silencing technology, DcOAP3A was found to be another putative function B gene. DcOAG2 is a putative function D gene, while DcOSEP1 could replace AP1 function. Our findings suggest that there is partial conservation in the function ABCDE genes between Arabidopsis and orchid. However, gene duplication may have led to the divergence in gene expression and regulation, resulting in the unique floral structure in orchids.
URI: http://scholarbank.nus.edu.sg/handle/10635/15519
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