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AtMyb56 Regulates Anthocyanin Levels via the Modulation of AtGPT2 Expression in Response to Sucrose in Arabidopsis

Authors
Jeong, Chan YoungKim, Jun HyeokLee, Won JeJin, Joo YeonKim, JongyunHong, Suk-WhanLee, Hojoung
Issue Date
4월-2018
Publisher
KOREAN SOC MOLECULAR & CELLULAR BIOLOGY
Keywords
Anthocyanin; Arabidopsis thaliana; AtMyb56; Myb transcription factor; plastidial glucose-6-phosphate/phosphate translocator; sucrose
Citation
MOLECULES AND CELLS, v.41, no.4, pp.351 - 361
Indexed
SCIE
SCOPUS
KCI
Journal Title
MOLECULES AND CELLS
Volume
41
Number
4
Start Page
351
End Page
361
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/76250
DOI
10.14348/molcells.2018.2195
ISSN
1016-8478
Abstract
Sucrose is a crucial compound for the growth and development of plants, and the regulation of multiple genes depends on the amount of soluble sugars present. Sucrose acts as a signaling molecule that regulates a proton-sucrose symporter, with its sensor being the sucrose transporter. Flavonoid and anthocyanin biosynthesis are regulated by sucrose, and sucrose signaling can affect flavonoid and anthocyanin accumulation. In the present study, we found a Myb transcription factor affecting accumulation of anthocyanin. AtMyb56 showed an increase in its expression in response to sucrose treatment. Under normal conditions, anthocyanin accumulation was similar between Col-0 (wild type) and atmyb56 mutant seedlings; however, under sucrose treatment, the level of anthocyanin accumulation was lower in the atmyb56 mutant plants than in Col-0 plants. Preliminary microarray analysis led to the investigation of the expression of one candidate gene, AtGPT2, in the atmyb56 mutant. The phosphate translocator, which is a plastidial phosphate antiporter family, catalyzes the import of glucose-6-phosphate (G-6-P) into the chloroplast. AtGPT2 gene expression was altered in atmyb56 seedlings in a sucrose-dependent manner in response to circadian cycle. Furthermore, the lack of AtMyb56 resulted in altered accumulation of maltose in a sucrose-dependent manner. Therefore, the sucrose responsive AtMyb56 regulates AtGPT2 gene expression in a sucrose-dependent manner to modulate maltose and anthocyanin accumulations in response to the circadian cycle.
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