Heterologous expression of AtPAP2 in transgenic potato influences carbon metabolism and tuber development |
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| Authors: | Youjun Zhang Feng Sun Joerg Fettke Mark Aurel Schöttler Lawrence Ramsden Alisdair R Fernie Boon Leong Lim |
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| Institution: | 1. Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany;2. School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China;3. Institute of Biochemistry and Biology, University of Potsdam, Golm, Germany |
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| Abstract: | Changes in carbon flow and sink/source activities can affect floral, architectural, and reproductive traits of plants. In potato, overexpression (OE) of the purple acid phosphatase 2 of Arabidopsis (AtPAP2) resulted in earlier flowering, faster growth rate, increased tubers and tuber starch content, and higher photosynthesis rate. There was a significant change in sucrose, glucose and fructose levels in leaves, phloem and sink biomass of the OE lines, consistent with an increased expression of sucrose transporter 1 (StSUT1). Furthermore, the expression levels and enzyme activity of sucrose-phosphate synthase (SPS) were also significantly increased in the OE lines. These findings strongly suggest that higher carbon supply from the source and improved sink strength can improve potato tuber yield. |
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| Keywords: | Potato AtPAP2 Photosynthesis Tuber yield Sugar efflux |
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