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| Effects of UV-B radiation on phenolic content and antioxidant capacity of Yuanyang red rice seeds |
| Received:April 22, 2021 |
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| KeyWord:UV-B radiation;red rice seeds;phenolic compounds;antioxidant capacity |
| Author Name | Affiliation | E-mail | | ZHOU Yingyuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Xiang | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LING Chengting | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yanqun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | HE Yongmei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | YANG Yongkang | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | liyuan@ynau.edu.cn |
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| Abstract: |
| OryzamIaponicamantiquam cum pedibusalbis, a traditional rice variety in Yuanyang terraces, was potted in a greenhouse to clarify the effects of enhanced UV-B radiation on the content of phenolic compounds and antioxidant capacity of rice grains. Different intensities of UV-B radiation(natural light and 2.5, 5.0, 7.5 kJ·m-2·d-1)were used to study the effects of enhanced UV-B radiation on the phenol content(including total phenols, total flavonoids, and phenolic acids)of rice grains, as well as the scavenging activity of phenols, namely: 1, 1-diphenyl-2-picrylhydrazyl(DPPH), 2, 2 ′ - azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS), and hydroxyl radicals. The results showed that the 1000-grain weight decreased by 34.9% and the grain biomass per plant decreased by 45.8% under high intensity(7.5 kJ·m-2·d-1)UV-B radiation, when compared with plants under natural light. The high-intensity radiation also affected the phenol content and the free radical scavenging activity of rice grains. The phenol content of rice grains did not change significantly under natural light. When the UV-B radiation reached 2.5 kJ·m-2·d-1, the phenol content increased significantly, but then decreased significantly at 7.5 kJ·m-2·d-1. Similarly, the free radical scavenging rate of phenols had no significant effect under natural light. The scavenging rate increased significantly at 2.5 kJ·m-2·d-1 and decreased significantly at 7.5 kJ·m-2·d-1. Enhanced UV-B radiation can promote the synthesis of phenols at low intensities and inhibit synthesis at high intensities, and the phenol content directly affects the scavenging rate of free radicals. |
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