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.

Nutrient solution composition and growing season affect yield and chemical composition of Cichorium spinosum plants

“…Moreover, they suggest the increase of tocopherol is dependent on nitrogen source and on genotype, which complicates the discussion of tocopherol composition and content. In addition, Hussain et al (2014) have confirmed that nitrogen source (ureic or ammonium nitrogen) and application rate may significantly affect alpha-, gamma-and total tocopherols content of rapeseeds oil. Furthermore, total tocopherols content was significantly higher in the 2nd growing period in comparison to the 1st growing period.…”

Enhanced accumulation of phytosterols and phenolic compounds in cyclodextrin-elicited cell suspension culture of Daucus carota

“…Both have the same isoprenoid precursor, GGDP, which is synthesized following the MEP pathway [44]. GGDP is also the precursor of others isoprenoid compounds, including tocopherols [45] and phytol (Fig. 1).…”

The alleviation of cadmium toxicity in oilseed rape (Brassica napus) by the application of salicylic acid

“…Zheshuang-72 represents low erucic acid seed quality and week winter hardness, while Zheshuang-758 having long life cycle and strong winter hardness properties. Beside these, Zheshuang-72 and Zheshuang-758 genotypes are the dominant cultivars in Zhejiang, China (Guan et al 2012;Hussain et al 2013Hussain et al , 2014.…”