Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 65, Issue 10, Pages 2066-2073Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b05253
Keywords
anthocyanins; pigment synthesis; postharvest; transcription factors; treatment; UV radiation; Vaccinium corymbosum
Funding
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education, Science, and Technology [NRF-2013R1A1A1057658]
- Aspiring Researcher Program through Seoul National University (SNU)
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This study was carried out to better understand the mechanism responsible for increasing the anthocyanins in blueberries after UV-B radiation at 6.0 kJ m(-2) for 20 min. UV-B induced upregulation of genes involved in anthocyanin biosynthesis in blueberry fruit compared to a nontreated control. Phenylalanine ammonia lyase, chalcone synthase, and flavanone 3'-hydroxylase, which are enzymes that function upstream of anthocyanin biosynthesis, were significantly expressed by UV-B. Expression levels of VcBBX, VcMYB21, and VcR2R3MYB transcription factors (TFs) were upregulated by UV-B in the same manner as the anthocyanin biosynthesis genes. The significant increase in the expression of TFs occurred immediately after UV-B treatment and was then maximized within 3 h. In accordance with these changes, individual anthocyanin contents in the fruits treated with UV-B significantly increased within 6 h and were 2-3-fold higher than the control. Our results indicated that UV-B radiation stimulates an increase in anthocyanin biosynthesis, which could be upregulated by the TFs studied.
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