The H⁺-pyrophosphatase IbVP1 regulates carbon flux to influence the starch metabolism and yield of sweet potato.

ABSTRACT: Storage roots of sweet potato are important sink organs for photoassimilates and energy, and carbohydrate metabolism in storage roots affects yield and starch production. Our previous study showed that sweet potato H⁺-pyrophosphatase (IbVP1) plays a vital role in mitigating iron deficiency and positively controls fibrous root growth. However, its roles in regulating starch production in storage roots have not been investigated. In this study, we found that IbVP1 overexpression in sweet potato improved the photosynthesis ability of and sucrose content in source leaves and increased both the starch content in and total yield of sink tissues. Using ¹³C-labeled sucrose feeding, we determined that IbVP1 overexpression promotes phloem loading and sucrose long-distance trans

SUBMITTER: Fan W 

PROVIDER: S-EPMC7847997 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature