Department of Geology and Mechanical Engineering, Bioengineering and Hydraulics for the Territory, University of Tuscia, Viterbo, Italy.
J Agric Food Chem. 2011 Apr 27;59(8):4198-207. doi: 10.1021/jf1048904. Epub 2011 Mar 23.
The effect of three different nitrogen (N) supply forms differing in their ammonium-to-nitrate (NH(4):NO(3)) ratio (100% NH(4), 50% NH(4) + 50% NO(3), 100% NO(3)) under three different levels of daily photosynthetic active radiation (PAR) (low, 5.0; medium, 6.8; high, 9.0 mol m(-2) day(-1)) on a range of desirable health-promoting phytochemicals in Brassica rapa subsp. nipposinica var. chinoleifera and Brassica juncea was determined. The 100% NH(4) supply under medium PAR levels led to the highest concentration of glucosinolates based on a low nitrogen/sulfur ratio as well as high levels of carotenoids in the leaves of both Brassica species. However, the 100% NH(4) supply under low and medium PAR levels resulted in low concentrations of flavonoids based on high N concentration in the leaves. Thus, the data provided here have strong implications for crop management strategies aimed at optimizing both the concentration and composition of a range of phytochemicals.
研究了在三种不同的日光合有效辐射（PAR）水平（低，5.0；中，6.8；高，9.0 mol m(-2) day(-1)）下，三种不同氮（N）供应形式（铵态氮与硝态氮比例不同：100%NH(4)、50%NH(4)+50%NO(3)、100%NO(3)）对 Brassica rapa subsp. nipposinica var. chinoleifera 和 Brassica juncea 中一系列有益健康的植物化学物质的影响。结果表明，中 PAR 水平下 100%NH(4)供应导致基于低氮/硫比的硫代葡萄糖苷浓度最高，以及两种芸薹属植物叶片中类胡萝卜素水平较高。然而，低 PAR 水平和中 PAR 水平下 100%NH(4)供应导致叶片中高氮浓度下黄酮类化合物浓度较低。因此，这里提供的数据对旨在优化一系列植物化学物质浓度和组成的作物管理策略具有重要意义。
