Agronomy Division, Department of Plant and Soil Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai, Thailand.
Office of the Deputy Vice Chancellor (Research& Innovation), Murdoch University, Perth, Australia.
J Sci Food Agric. 2018 Sep;98(12):4527-4532. doi: 10.1002/jsfa.8978. Epub 2018 Apr 19.
Anthocyanin is a major antioxidant compound in purple rice, with properties that can protect against oxidative damage in some human diseases. This study was undertaken to determine if nitrogen (N) fertilizer can enhance anthocyanin and antioxidant levels in four purple Thai rice genotypes.
The anthocyanin concentration and antioxidant capacity were increased in the shoots of N120 plants compared with plants without N. The leaves had higher anthocyanin concentration and antioxidant capacity than the stem+leaf sheath. Maximum shoot anthocyanin concentrations occurred at tillering and then declined by 87-94% at maturity. Antioxidant capacity was high at tillering and panicle initiation and declined by 26% in leaves and by 98% in the stem+leaf sheath at maturity. Unlike in the vegetative shoot, grain anthocyanin was not affected by the addition of N fertilizer. The response of grain antioxidant capacity to N fertilizer was affected by genotype, increasing in KPY by 45% but decreasing in K19959 by 30% in N120 plants.
Applying N fertilizer could be a promising way to improve the antioxidative properties in vegetative parts for use in rice-grass juice, cosmetics and other products, especially the young leaves, which contained high values of anthocyanin as well as antioxidant capacity. However, further field studies should be undertaken to optimize N utilization for anthocyanin and antioxidant capacity in purple rice genotypes. © 2018 Society of Chemical Industry.
花色苷是紫米中的一种主要抗氧化化合物，具有保护某些人类疾病氧化损伤的特性。本研究旨在确定氮肥是否可以提高四种泰国紫米品种的花色苷和抗氧化水平。
与不施氮的植株相比，施氮 120 植株的地上部花色苷浓度和抗氧化能力增加。叶片的花色苷浓度和抗氧化能力均高于茎+叶鞘。最大地上部花色苷浓度出现在分蘖期，然后在成熟时下降 87-94%。抗氧化能力在分蘖期和穗分化期较高，叶片和茎+叶鞘在成熟时分别下降 26%和 98%。与营养体地上部不同，施氮对籽粒花色苷没有影响。籽粒抗氧化能力对氮素肥料的反应受基因型的影响，在 KPY 中增加 45%，而在 K19959 中减少 30%。
施氮可能是提高稻草汁、化妆品和其他产品中营养体部分抗氧化特性的一种有前途的方法，特别是嫩叶，其花色苷和抗氧化能力均较高。然而，应进一步进行田间研究，以优化紫米品种中花色苷和抗氧化能力的氮素利用。 © 2018 英国化学学会。
