%A Song HOU, Xia TIAN, Qing LIU %T Effects of Foliage Spray of Se on Absorption Characteristics of Se and Quality of Purple Sweet Potato %0 Journal Article %D 2018 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2018.00423 %P 423-430 %V 44 %N 03 %U {https://zwxb.chinacrops.org/CN/abstract/article_6441.shtml} %8 2018-03-12 %X

In order to clarify the absorption characteristics of selenium (Se), root yield, Se utilization, content of amino acids and mineral elements in purple sweet potato, a field experiment of foliage spraying with three treatments of 0, 30, and 60 g ha-1 pure Se application were carried out in 2015 and 2016 respectively. The root yield of purple sweet potato received no significantly effect from Se foliage spray, the Se content, organic Se content and the Se accumulation in root were improved, with a root Se content of 311.3 µg kg-1 (DW), 8.54 times as high as that of the control under 60 g ha-1 Se application. Se content and accumulation amount in root increased and the utilization rate of Se decreased significantly with the increase of Se application, while the content of organic Se in root received no significantly effect from Se foliage spray. With increasing Se application, the content of crude protein in root of purple sweet potato was significantly increased, which was 11.67% and 29.71% higher than that of CK under Se treatment of 30 g ha-1 and 60 g ha-1 respectively. Under 60 g ha-1 Se application treatment, seven essential amino acids for human body contained in roots increased significantly except Threonine, and the other six nonessential amino acids in roots also increased significantly such as Asparagine, Serine, Glutamic acid, but the content of Cysteine decreased. Se application treatments increased the contents of K, Na, Mg, Fe, Cu and decreased the contents of Ca, Mn in roots of purple sweet potato, but had no effect on content of Zn. The results of this study are of significance guiding production of Se-enriched purple sweet potato.