文章摘要
周应嫄,李想,凌成婷,祖艳群,何永美,杨雍康,李元.UV-B辐射对元阳红米籽粒酚类含量及其抗氧化能力的影响[J].农业环境科学学报,2022,41(1):10-18.
UV-B辐射对元阳红米籽粒酚类含量及其抗氧化能力的影响
Effects of UV-B radiation on phenolic content and antioxidant capacity of Yuanyang red rice seeds
投稿时间:2021-04-22  
DOI:10.11654/jaes.2021-0476
中文关键词: UV-B辐射  红米籽粒  酚类化合物  抗氧化能力
英文关键词: UV-B radiation  red rice seeds  phenolic compounds  antioxidant capacity
基金项目:国家自然科学基金项目(31760113,31460141,41565010);云南省农田无公害生产科技创新团队项目(2017HC015)
作者单位E-mail
周应嫄 云南农业大学资源与环境学院昆明 650201  
李想 云南农业大学资源与环境学院昆明 650201  
凌成婷 云南农业大学资源与环境学院昆明 650201  
祖艳群 云南农业大学资源与环境学院昆明 650201  
何永美 云南农业大学资源与环境学院昆明 650201  
杨雍康 云南农业大学资源与环境学院昆明 650201  
李元 云南农业大学资源与环境学院昆明 650201 liyuan@ynau.edu.cn 
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中文摘要:
      为阐明UV-B辐射增强对水稻籽粒中酚类化合物含量及其抗氧化能力的影响,通过大棚盆栽种植元阳梯田传统水稻品种——白脚老粳(OryzamIaponicamantiquam cum pedibusalbis)。在水稻各生长期进行不同强度UV-B辐射处理(自然光和2.5、5.0、7.5 kJ·m-2·d-1),研究UV-B辐射增强对水稻籽粒酚类化合物含量(包括总酚、总黄酮、总酚酸)的影响和酚类清除活性氧自由基[包括1,1-二苯基-2-三硝基苯肼(1,1 - diphenyl - 2 - picrylhydrazyl,DPPH)、2,2 ′ - 联氮- 双- 3-6 - 磺酸(2,2 ′ - azino-bis(3- ethylbenzothiazoline-6-sulfonic acid), ABTS)和羟自由基]的影响。结果表明:当UV-B辐射强度增加至7.5 kJ·m-2·d-1时,相较于自然光,千粒质量降低了34.9%,每株籽粒生物量下降了45.8%,同时对水稻籽粒酚类含量及其清除自由基的能力产生影响。水稻籽粒中酚类含量在自然光下无显著变化,当UV-B辐射达到2.5 kJ·m-2·d-1时酚类含量显著升高,但7.5 kJ·m-2·d-1时酚类含量会显著降低,同样地,酚类对自由基的清除率在自然光下无显著影响,在2.5 kJ·m-2·d-1时清除率显著上升,7.5 kJ·m-2·d-1清除率显著下降。研究表明,UV-B辐射增强对酚类合成作用表现为低强度促进高强度抑制,且酚类含量的高低直接影响自由基的清除率。
英文摘要:
      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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