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Source-sink synergy is the key unlocking sweet potato starch yield potential
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Journal Article
Source-sink synergy is the key unlocking sweet potato starch yield potential
2024
Overview
Sweet potato starch is in high demand globally for food and industry. However, starch content is negatively correlated with fresh yield. It is urgent to uncover the genetic basis and molecular mechanisms underlying the starch yield of sweet potato. Here we systematically explore source-sink synergy-mediated sweet potato starch yield formation: the production, loading, and transport of photosynthates in leaves, as well as their unloading and allocation in storage roots, lead to starch content divergence between sweet potato varieties. Moreover, we find that six haplotypes of
IbPMA1
encoding a plasma membrane H
+
-ATPase are significantly linked with starch accumulation. Overexpression of
IbPMA1
in sweet potato results in significantly increased starch and sucrose contents, while its knockdown exhibits an opposing effect. Furthermore, a basic helix-loop-helix (bHLH) transcription factor IbbHLH49 directly targets
IbPMA1
and activates its transcription. Overexpression of
IbbHLH49
notably improves source-sink synergy-mediated fresh yield and starch accumulation in sweet potato. Both
IbbHLH49
and
IbPMA1
substantially influence sugar transport and starch biosynthesis in source and sink tissues. These findings expand our understanding of starch yield formation and provide strategies and candidate genes for high starch breeding in root and tuber crops.
Sweet potato starch has high global demand. Here the authors investigate the relationship between fresh yield and starch accumulation mediated by the source-sink process, and demonstrate that IbbHLH49 and IbPMA1 are vital for sugar transport and starch biosynthesis in sweet potato.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 38/23
/ 38/77
/ 45/77
/ 45/90
/ 45/91
/ 96/1
/ Gene Expression Regulation, Plant
/ Helix-loop-helix proteins (basic)
/ Humanities and Social Sciences
/ Ipomoea batatas - growth & development
/ Ipomoea batatas - metabolism
/ Plant Roots - growth & development
/ Plants, Genetically Modified
/ Potatoes
/ Proton-Translocating ATPases - genetics
/ Proton-Translocating ATPases - metabolism
/ Science
/ Starch
/ Sucrose
/ Sugar
