<Emphasis Type="Italic">Arabidopsis thaliana</Emphasis> plants overexpressing <Emphasis Type="Italic">Ramosa1</Emphasis> maize gene show an increase in organ size due to cell expansion |
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Authors: | Michela Landoni Elena Cassani Roberto Pilu |
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Institution: | (1) Dipartimento di Produzione Vegetale, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy;(2) Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy |
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Abstract: | The structure of the plant inflorescence and flower is an important agronomic and ornamental trait studied for its potential
economic applications. In particular, the capacity to modify flower size has always been a breeder’s goal. Genetic and molecular
studies have shown that the Zea mays gene Ramosa1 (Ra1) is involved in inflorescence branching regulation. In fact the ra1 loss of function mutation causes extra branching of the inflorescence. In this work we suggest a possible utilization of
the Ramosa1 maize gene as a tool to modify inflorescence architecture and flower size in transgenic plants. In fact overexpression of
this gene in Arabidopsis plants promotes an increase in reproductive organ size. Pollen, seeds, cotyledons, leaves and roots are also larger than
those of the wild type. Analysis of organs from transformants showed that cell expansion was increased without apparently
affecting cell division. These results suggest that the RA1 protein is able to up-regulate cell expansion in all organs of
Arabidopsis plants. |
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Keywords: | Ramosa1 gene Zea mays Arabidopsis thaliana Cell expansion Flower size |
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