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A method for transient expression in maize endosperm
Authors:Deborah Vicuna Requesens  Erin Egelkrout  Shivakumar Devaiah  Elizabeth E Hood
Institution:(1) Arkansas Biosciences Institute, Arkansas State University, P.O. Box 639, State University, AR 72467, USA;(2) Applied Biotechnology Institute, San Luis Obispo, CA, USA
Abstract:The ability to screen the functionality of gene constructs in a transient system of appropriate tissues informs the researcher of the potential success of stable transformation. For this purpose, we developed a transient system to test the functionality of endosperm-preferred promoters in maize. Two endosperm-preferred promoters from rice (a globulin and a glutelin promoter) were employed. Ears of Zea mays L. were harvested at 17 d after pollination, surface sterilized and the endosperm excised. Using Agrobacterium tumefaciens co-cultivation and sonication, transient expression of the target genes was detected after 4 and 5 d. We demonstrate expression of CBH I and CHB II (both exo-cellulases) up to 1.7% TSP, under the rice globulin and glutelin promoters.
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