Transcriptional regulation of chlorogenic acid biosynthesis in carrot root slices exposed to UV-B light

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• 作者：Glenn E. Bartley ; ^{glenn.bartley@ars.usda.gov" class="auth_mail" title="E-mail the corresponding author} ; Roberto J. Avena-Bustillos ; Wen-Xian Du ; Marlene Hidalgo ; Brian Cain ; Andrew P. Breksa III
• 关键词：Chlorogenic acid ; Phenylpropanoid pathway ; UV-B light ; HY5 ; Real-time PCR ; Gene expression
• 刊名：Plant Gene
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：7
• 期：Complete
• 页码：1-10
• 全文大小：1420 K

文摘

Orange carrots are well known for their nutritional value as producers of β-carotene, a vitamin A precursor. Lesser known, is their ability to accumulate antioxidants such as chlorogenic acid. Chlorogenic acid is produced through the same biosynthetic pathway that produces lignins, anthocyanins, flavonols and isoflavonoids, the phenylpropanoid pathway. This pathway can be induced by UV-B light and wounding to produce large amounts of chlorogenic acid. We identified a number of the carrot structural genes in this pathway and their proposed regulators in carrot root slices and analyzed their expression in response to UV-B light exposure using real-time PCR. Our results indicate that not only does the expression of the structural genes correlate with their proposed regulators, including DcHY5 and others, but also correlate with chlorogenic acid production. Our results indicate that the HY5 — UVR8 signaling network may exist and function in carrot roots.