Transcription Factor CitERF16 Is Involved in Citrus Fruit Sucrose Accumulation by Activating CitSWEET11d

Sugars are the primary products of photosynthesis and play an important role in plant growth and development. They contribute to sweetness and flavor of fleshy fruits and are pivotal to fruit quality, and their translocation and allocation are mainly dependent on sugar transporters. Genome-wide char...

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Bibliographic Details
Published in:Frontiers in plant science 2021-12, Vol.12, p.809619-809619
Main Authors: Hu, Xiaobo, Li, Shaojia, Lin, Xiahui, Fang, Heting, Shi, Yanna, Grierson, Donald, Chen, Kunsong
Format: Article
Language:English
Subjects:
citrus fruit
ERF
Plant Science
sucrose
SWEET transporters
transcriptional regulation
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Summary:Sugars are the primary products of photosynthesis and play an important role in plant growth and development. They contribute to sweetness and flavor of fleshy fruits and are pivotal to fruit quality, and their translocation and allocation are mainly dependent on sugar transporters. Genome-wide characterization of Satsuma mandarin identified eighteen family members that encode transporters which facilitate diffusion of sugar across cell membranes. Analysis of the expression profiles in tissues of mandarin fruit at different developmental stages showed that transcripts were significantly correlated with sucrose accumulation. Further studies indicated that overexpression of in citrus callus and tomato fruit showed a higher sucrose level compared to wild-type, suggesting that CitSWEET11d could enhance sucrose accumulation. In addition, we identified an ERF transcription factor CitERF16 by yeast one-hybrid screening assay which could directly bind to the DRE -element on the promoter of . Overexpression of in citrus callus significantly induced expression and elevated sucrose content, suggesting that CitERF16 acts as a positive regulator to promote sucrose accumulation trans-activation of expression.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2021.809619