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MicroRNA-mediated Regulation Of Flower Development In Grasses.

Aleksandra Smoczyńska, Z. Szweykowska-Kulinska
Published 2016 · Biology, Medicine

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Flower structure in grasses is very unique. There are no petals or sepals like in eudicots but instead flowers develop bract-like structures - palea and lemma. Reproductive organs are enclosed by round lodicule that not only protects reproductive organs but also plays an important role during flower opening. The first genetic model for floral organ development was proposed 25 years ago and it was based on the research on model eudicots. Since then, studies have been carried out to answer the question whether this model could be applicable in the case of monocots. Genes from all classes found in eudicots have been also identified in genomes of such monocots like rice, maize or barley. What's more, it seems that miRNA-mediated regulation of floral organ genes that was observed in the case of Arabidopsis thaliana also takes place in monocots. MiRNA172, miRNA159, miRNA171 and miRNA396 regulate expression of floral organ identity genes in barley, rice and maize, affecting various features of the flower structure, ranging from formation of lemma and palea to the development of reproductive organs. A model of floral development in grasses and its genetic regulation is not yet fully characterized. Further studies on both, the model eudicots and grasses, are needed to unravel this topic. This review provides general overview of genetic model of flower organ identity specification in monocots and it's miRNA-mediated regulation.
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