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Open AccessArticle

HD-ZIP I Transcription Factor (PtHB13) Negatively Regulates Citrus Flowering through Binding to FLOWERING LOCUS C Promoter

1
Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan 430070, China
2
Chinese Academy of Agriculture Sciences, Zhengzhou Fruit Research Institute, Zhengzhou 450009, China
3
Institute of Pomology and Tea, Hubei Academy of Agricultural Sciences, Wuhan 430070, China
*
Authors to whom correspondence should be addressed.
Plants 2020, 9(1), 114; https://doi.org/10.3390/plants9010114
Received: 1 December 2019 / Revised: 26 December 2019 / Accepted: 14 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue Advances in Citrus Research)
For floral induction in adult citrus, low temperature is one of the most important environmental factors. FLOWERING LOCUS C (FLC) plays a very important role in low-temperature-induced Arabidopsis flowering by repressed FLC expression under exposure to prolonged low-temperature conditions. However, little is known about the FLC regulation mechanism in perennial woody plants such as citrus. In this study, the functions of citrus FLC homolog (PtFLC) were investigated by ectopic expression in Arabidopsis. Transcription factor of homeodomain leucine zipper I (HD-ZIP I) as an upstream regulator of PtFLC was identified by yeast one-hybrid screen to regulate its transcription. The HD-ZIP I transcription factor was highly homologous to Arabidopsis ATHB13 and thus was named PtHB13. Ectopically expressed PtHB13 inhibited flowering in transgenic Arabidopsis. Furthermore, the expression of PtFLC and PtHB13 showed a seasonal change during the floral induction period and was also affected by low temperature. Thus, we propose that PtHB13 binds to PtFLC promoter to regulate its activity during the citrus floral induction process. View Full-Text
Keywords: citrus; flowering; FLC; FT; low temperature citrus; flowering; FLC; FT; low temperature
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MDPI and ACS Style

Ma, Y.-J.; Li, P.-T.; Sun, L.-M.; Zhou, H.; Zeng, R.-F.; Ai, X.-Y.; Zhang, J.-Z.; Hu, C.-G. HD-ZIP I Transcription Factor (PtHB13) Negatively Regulates Citrus Flowering through Binding to FLOWERING LOCUS C Promoter. Plants 2020, 9, 114.

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