Recently, Zhang Peng, a researcher at the Center for Excellence in Molecular Plant Science, Chinese Academy of Sciences, published an online publication entitled The H+-pyrophosphatase IbVP1 regulates carbon flux to Horticulture Research influence the starch metabolism and yield of sweet potato. This study found for the first time that the expression of H+-pyrophosphorylase IbVP1 can significantly improve the quality and yield of sweet potato root starch.
sweet potato storage root is an important underground reservoir organ for photosynthesis and energy accumulation. Its starch metabolism level determines the starch content and yield, and it is also affected by the aboveground source organs ( Leaf) the influence of sugar output capacity. The previous research of the research group found that sweet potato hydrogen ion pyrophosphorylase (IbVP) plays an important role in promoting the absorption of mineral elements and the growth of fibrous roots (Fan et al., 2017). It enhances iron acquisition through rhizosphere acidification and strengthens sweet potato Plant carbohydrate metabolism level. The study further found that overexpression of the IbVP1 gene increased the photosynthetic capacity and sucrose content of sweetpotato leaves; feeding with 13C-labeled sucrose proved to promote phloem loading and long-distance sucrose transportation, and improve the carbon flow distribution ability; , The expression level and enzyme activity of starch synthase AGPase, GBSSI, SSI and other genes are up-regulated, starch synthesis capacity is improved, amylose and total starch content increase, resulting in obvious changes in the physical and chemical properties of starch. This research system reveals the important role of the VP1 gene in optimizing the”source-sink” relationship of sweet potato. Through the”yin-yang” dual regulation of Pi ions and hydrogen protons, the yield and quality of sweet potatoes are improved.
Dr. Fan Weijuan is the first author of the paper, and Zhang Peng and associate researcher Wang Hongxia are the co-corresponding authors of the paper. The research work is supported by the National Key Research and Development Program and the National Natural Science Foundation of China.
Sweet potato overexpression VP1 promotes root storage Yield and improve starch quality. VP1 promotes photochemical mobilization and starch synthesis (a-e), realizes the”yin-yang” dual regulation of Pi ions and hydrogen protons (f), and improves the”source-sink” relationship of sweet potato