Perner Henrike, Rohn Sascha, Driemel Gregor, Batt Natalie, Schwarz Dietmar, Kroh Lothar W, George Eckhard
Department of Plant Nutrition, Institute of Vegetable and Ornamental Crops e.V. Grossbeeren, Theodor Echtermeyer Weg 1, D-14979 Grossbeeren, Germany.
J Agric Food Chem. 2008 May 28;56(10):3538-45. doi: 10.1021/jf073337u. Epub 2008 May 6.
The aim of the present study was to test whether variations in the root environment affect the content of health-related organosulfur compounds, total phenolic compounds, and flavonol glycoside concentrations in onions. For this purpose, greenhouse-grown onions ( Allium cepa L.) were either inoculated with a commercial arbuscular mycorrhizal inoculum or a sterile inoculum and were provided with two NH(4)(+):NO(3)(-) ratios as a nitrogen source. Onion growth, arbuscular mycorrhizal colonization rate, sugars, and nutrient element concentrations were also quantified. The plant antioxidant activity and quercetin monoglucoside and organosulfur compound concentrations increased with dominant nitrate supply. Furthermore, mycorrhizal colonization increased the antioxidant activity and also concentrations of the major quercetin glucosides. The present study provides clear evidence that antioxidant activity, quercetin glycosides, and organosulfur compounds can be increased in sufficiently supplied onion plants by dominant nitrate supply or application of arbuscular mycorrhizal fungi. This was probably due to increased precursor production and induced defense mechanisms.
本研究的目的是测试根部环境的变化是否会影响洋葱中与健康相关的有机硫化合物、总酚类化合物和黄酮醇糖苷的含量。为此，在温室中种植洋葱（葱属植物洋葱），分别接种商业丛枝菌根接种物或无菌接种物，并提供两种NH(4)(+):NO(3)(-)比例作为氮源。还对洋葱的生长、丛枝菌根定殖率、糖分和营养元素浓度进行了量化。植物抗氧化活性以及槲皮素单糖苷和有机硫化合物的浓度随着主要硝酸盐供应而增加。此外，菌根定殖增加了抗氧化活性以及主要槲皮素糖苷的浓度。本研究提供了明确的证据，即通过主要硝酸盐供应或应用丛枝菌根真菌，可以提高供应充足的洋葱植株的抗氧化活性、槲皮素糖苷和有机硫化合物。这可能是由于前体产量增加和诱导防御机制所致。
