High efficiency plastid transformation in potato and regulation of transgene expression in leaves and tubers by alternative 5′ and 3′ regulatory sequences

Transgenic Research - Tập 20 - Trang 137-151 - 2010
Vladimir T. Valkov1, Daniela Gargano1,2, Carmela Manna1, Gelsomina Formisano1, Philip J. Dix3, John C. Gray4, Nunzia Scotti1, Teodoro Cardi1
1CNR-IGV, Institute of Plant Genetics, Res. Div. Portici, Portici, Italy
2Center for Organelle Research, University of Stavanger, Stavanger, Norway
3Biology Department, National Univerisity of Ireland-Maynooth, Maynooth, Co. Kildare, Ireland
4Department of Plant Sciences, University of Cambridge, Cambridge, UK

Tóm tắt

Transformation of potato plastids is limited by low transformation frequencies and low transgene expression in tubers. In order to improve the transformation efficiency, we modified the regeneration procedure and prepared novel vectors containing potato flanking sequences for transgene integration by homologous recombination in the Large Single Copy region of the plastome. Vector delivery was performed by the biolistic approach. By using the improved regeneration procedure and the potato flanking sequences, we regenerated about one shoot every bombardment. This efficiency corresponds to 15–18-fold improvement compared to previous results with potato and is comparable to that usually achieved with tobacco. Further, we tested five promoters and terminators, and four 5′-UTRs, to increase the expression of the gfp transgene in tubers. In leaves, accumulation of GFP to about 4% of total soluble protein (TSP) was obtained with the strong promoter of the rrn operon, a synthetic rbcL-derived 5′-UTR and the bacterial rrnB terminator. GFP protein was detected in tubers of plants transformed with only four constructs out of eleven. Best results (up to approximately 0.02% TSP) were achieved with the rrn promoter and rbcL 5′-UTR construct, described above, and another containing the same terminator, but with the promoter and 5′-UTR from the plastid clpP gene. The results obtained suggest the potential use of clpP as source of novel regulatory sequences in constructs aiming to express transgenes in amyloplasts and other non-green plastids. Furthermore, they represent a significant advancement of the plastid transformation technology in potato, of relevance to its implementation in potato breeding and biotechnology.

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