<i>CaHY5</i> Mediates UV-B Induced Anthocyanin Biosynthesis in Purple Pepper

<i>CaHY5</i> Mediates UV-B Induced Anthocyanin Biosynthesis in Purple Pepper

Anthocyanins are important flavonoid compounds in plants that are associated with the color formation and antioxidant activity of flowers, fruits, and other organs. Ultraviolet B radiation (UV-B) is one of the key environmental factors that influence anthocyanin accumulation in plants and <i>H...

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Main Authors: Xiang Zhang, Yunrong Mo, Huidan Zhou, Mengjuan Li, Hong Cheng, Pingping Li, Ruihao Zhang, Yaoyao Huang, Yanyan Wang, Junqiang Xu, Jingjing Liao, Qiaoli Xie, Kai Zhao, Minghua Deng, Junheng Lv
Format: Article
Language:English
Published: MDPI AG 2024-12-01
Series:Agronomy
Subjects:
<i>Capsicum annuum</i> L.
<i>CaHY5</i> gene
abiotic stress
anthocyanin biosynthesis
Online Access:https://www.mdpi.com/2073-4395/15/1/28
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Summary:Anthocyanins are important flavonoid compounds in plants that are associated with the color formation and antioxidant activity of flowers, fruits, and other organs. Ultraviolet B radiation (UV-B) is one of the key environmental factors that influence anthocyanin accumulation in plants and <i>HY5</i> is involved in plant photomorphogenesis. However, the molecular mechanism of the signal network of UV-B regulating anthocyanin biosynthesis in capsicum via <i>HY5</i> remains unclear. In this study, we identified the transcription factor <i>CaHY5</i>, which mediates UV-B signaling, and demonstrated its regulatory role in anthocyanin biosynthesis in purple pepper (<i>Capsicum annuum</i> L.). The results showed that there were photoresponsive and hormone-responsive elements on the <i>CaHY5</i> promoter that responded to UV-B, indoleacetic acid, salicylic acid, 6-benzyladenine, abscisic acid, and melatonin treatments. UV-B treatment induced the expression of <i>CaHY5</i> and anthocyanin structural genes. <i>CaHY5</i> gene-silenced positive plants showed different degrees of the yellowing phenomenon, which affected the expression of the anthocyanin biosynthesis structural gene. The expression levels of anthocyanin biosynthesis-related genes in <i>CaHY5</i>-silenced positive plants increased considerably. This study provides insights into the role of <i>CaHY5</i> in UV-B-induced anthocyanin biosynthesis in purple pepper.
ISSN:2073-4395

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