Multiple MYB Activators and Repressors Collaboratively Regulate the Juvenile Red Fading in Leaves of Sweetpotato

Frontiers in Plant Science
Jiliang DengZhixin Zhu

Abstract

Juvenile red fading describes the phenomenon in plants whereby red young leaves gradually turn green as they mature. While this phenomenon is commonly observed, the underlying molecular mechanism is still obscure as the classic model plants do not exhibit this process. Here, the molecular mechanism for the loss of anthocyanins during juvenile red fading were explored in the sweetpotato (Ipomoea batatas L.) cultivar "Chuanshan Zi". The MYB-bHLH-WDR (MBW) regulatory complexes for anthocyanins were examined with five stages of leaf development from C1 to C5. Alternating accumulation of anthocyanins and chlorophylls caused the leaf color change. Five anthocyanin components were identified by ultra performance liquid chromatography/tandem mass spectrometry (UPLC-MS/MS), and their contents were highest at stage C2. Transcriptomic analysis showed massive gene expression alteration during leaf development. The anthocyanin structural genes expressed in sweetpotato leaves were screened and found to be highly comparable with those identified in morning glories. The screened anthocyanin regulatory genes included one bHLH (IbbHLH2), one WDR (IbWDR1), three MYB activators (IbMYB1, IbMYB2, and IbMYB3), and five MYB repressors (IbMYB27, IbMYBx...Continue Reading

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Citations

Apr 18, 2021·The New Phytologist·Amy M LaFountain, Yao-Wu Yuan

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Datasets Mentioned

BETA
MT231489
MT231504
MT557573
MT557584

Methods Mentioned

BETA
transgenic
electrophoresis
Illumina sequencing
PCR
RNA-Seq
PCRs
Assay

Software Mentioned

TopHat2
MEGA X

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