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Carmela Cantone, M. Sica, L. Gaudio, S. Aceto (2009)
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Molecular evolution of the OrcPI locus in natural populations of Mediterranean orchids.Gene, 392 1-2
M Gorniak, O Paun, MW Chase (2010)
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Expression of a DEFICIENS-like gene correlates with the differentiation between sepal and petal in the orchid, Habenaria radiata (Orchidaceae)Plant Science, 172
Carmela Cantone, L. Gaudio, S. Aceto (2011)
The PI/GLO-like locus in orchids: duplication and purifying selection at synonymous sites within Orchidinae (Orchidaceae).Gene, 481 1
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Mariana Mondragón-Palomino, Luisa Hiese, A. Härter, M. Koch, G. Theißen (2009)
Positive selection and ancient duplications in the evolution of class B floral homeotic genes of orchids and grassesBMC Evolutionary Biology, 9
The class B MADS-box genes belong to two distinct functional groups: the AP3/DEF -like and the PI/GLO -like sub-families. In orchids, AP3/DEF -like genes are present in four copies, each with a different role in floral organ formation, which is described in the “orchid code” model. Interestingly, the orchid PI/GLO -like genes are present in two copies in Orchidinae, whereas they are described as single copy in the other orchid lineages. The two PI/GLO -like paralogs have site-specific different selective constraints; in addition, they show relaxation of purifying selection when compared to the single-copy lineages. In this study, we present a comparative analysis of the expression patterns of the two PI/GLO -like paralogs, OrcPI and OrcPI2 , in floral tissues of Orchis italica in different developmental stages using real-time PCR. The two genes show similar expression profiles in the tissue examined, with differences detectable between immature and mature inflorescence. In all cases, OrcPI2 is expressed at a higher level than OrcPI . Real-time PCR results reveal that the co-expression of the two duplicated loci could have a fully or partially redundant function. The possible evolutionary fate of OrcPI and OrcPI2 is discussed as well as their involvement in ovary development.
Development Genes and Evolution – Springer Journals
Published: Oct 1, 2011
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