title: Response of seed tocopherols in oilseed rape to nitrogen fertilizer sources and application rates.
abstract: Tocopherols (Tocs) are vital scavengers of reactive oxygen species (ROS) and important seed oil quality indicators. Nitrogen (N) is one of the most important fertilizers in promoting biomass and grain yield in crop production. However, the effect of different sources and application rates of N on seed Toc contents in oilseed rape is poorly understood. In this study, pot trials were conducted to evaluate the effect of two sources of N fertilizer (urea and ammonium nitrate). Each source was applied to five oilseed rape genotypes (Zheshuang 72, Jiu-Er-1358, Zheshuang 758, Shiralee, and Pakola) at three different application rates (0.41 g/pot (N1), 0.81 g/pot (N2), and 1.20 g/pot (N3)). Results indicated that urea increased α-, γ-, and total Toc (T-Toc) more than did ammonium nitrate. N3 was proven as the most efficient application rate, which yielded high contents of γ-Toc and T-Toc. Highly significant correlations were observed between Toc isomers, T-Toc, and α-/γ-Toc ratio. These results clearly demonstrate that N sources and application rates significantly affect seed Toc contents in oilseed rape.
authors: Key Laboratory of Crop Gene Resources of Zhejiang Province, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
authors: Nazim
authors: N
authors: Hussain
authors: Hui
authors: H
authors: Li
authors: Yu-xiao
authors: YX
authors: Jiang
authors: Zahra
authors: Z
authors: Jabeen
authors: Imran Haider
authors: IH
authors: Shamsi
authors: Essa
authors: E
authors: Ali
authors: Li-xi
authors: LX
authors: Jiang
mesh_terms: D018533:Biomass; D029688:Brassica napus / Q000378:metabolism*; D005308:Fertilizers / Q000032:analysis*; D005838:Genotype; D009566:Nitrates / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D017382:Reactive Oxygen Species; D012639:Seeds / Q000378:metabolism*; D012987:Soil; D024505:Tocopherols / Q000737:chemistry*; D014508:Urea / Q000737:chemistry
chemical_list: D005308:Fertilizers; D009566:Nitrates; D017382:Reactive Oxygen Species; D012987:Soil; D014508:Urea; D009584:Nitrogen; D024505:Tocopherols; C006568:ammonium nitrate