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Acta Agronomica Sinica ›› 2018, Vol. 44 ›› Issue (03): 423-430.doi: 10.3724/SP.J.1006.2018.00423

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Foliage Spray of Se on Absorption Characteristics of Se and Quality of Purple Sweet Potato

Song HOU(), Xia TIAN, Qing LIU*()   

  1. College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, Shandong, China
  • Received:2017-07-27 Accepted:2018-11-21 Online:2018-03-12 Published:2017-12-18
  • Contact: Qing LIU E-mail:hhousong@163.com;qy7271@163.com
  • Supported by:
    This study was supported by China Agriculture Research System (CARS-10-B10), the Key Project of the Shandong Research and Development Program (2016GNC110020), and Special Projects for Public Welfare Research (201303106).

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Abstract:

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.

Key words: purple sweet potato, selenium, absorption and accumulation, protein, amino acid, mineral elements, foliar spraying

Fig. 1

Yield of root tuber of purple sweet potato under different selenium treatments In each growing season, bars superscripted by the same letters are not significantly different at P < 0.05."

Table 1

Concentration of total selenium in organs of purple sweet potato under different selenium treatments (µg kg-1 DW)"

年度
Year		 处理
Treatment		 各器官含硒量 Se content in organs
块根 Root tuber 茎 Stem 叶 Leaf 叶柄 Petiole
2015 CK 39.9±8.2 c 54.2±7.4 c 156.3±12.4 c 63.7±9.7 c
Se1 209.7±25.3 b 289.1±28.7 b 503.9±47.6 b 277.0±32.1 b
Se2 301.6±33.2 a 680.1±45.3 a 1333.5±105.7 a 589.3±62.3 a
2016 CK 33.5±6.1 c 50.3±6.5 c 134.8±18.3 c 55.4±6.8 c
Se1 189.1±23.4 b 266.9±30.2 b 487.6±55.9 b 283.6±27.2 b
Se2 311.3±38.7 a 649.6±51.9 a 1299.0±111.2 a 567.8±58.4 a

Table 2

Concentration of organic selenium in root tuber and the ratios to total selenium under different selenium treatments"

年度
Year		 处理
Treatment		 总硒
Total selenium
(µg kg-1 DW)		 有机硒
Organic selenium
(µg kg-1 DW)		 有机硒占总硒的比例
Ratios of organic selenium to total selenium (%)
2015 CK 39.9±8.2 c 30.6±7.6 c 76.81 a
Se1 209.7±25.3 b 154.1±22.3 b 73.43 a
Se2 301.6±33.2 a 229.2±30.8 a 75.96 a
2016 CK 33.5±6.1 c 25.9±6.4 c 77.33 a
Se1 189.1±23.4 b 140.5±22.9 b 74.25 a
Se2 311.3±38.7 a 244.6±38.1 a 78.56 a

Table 3

Selenium accumulation and utilization rate under different selenium treatments"

年度
Year		 处理
Treatment		 块根硒含量
Concentration of
selenium in root tuber
(µg kg-1 DW)		 块根产量
Yield of root tuber
(t hm-2 FW)		 薯块含水率
Moisture content
in root tuber (%)		 块根硒累积量
Selenium accumulation in root tuber (mg hm-2)		 块根硒利用率
Utilization ratio of selenium in root tuber (%)
2015 CK 39.9±8.2 c 31.6±3.66 a 71.24 362.6 —
Se1 209.7±25.3 b 30.7±4.24 a 70.83 1877.9 5.05
Se2 301.6±33.2 a 29.6±3.58 a 70.36 2646.1 3.81
2016 CK 36.5±6.1 c 30.7±4.01 a 71.05 324.4 —
Se1 189.1±23.4 b 29.6±3.23 a 70.77 1636.1 4.37
Se2 311.3±38.7 a 28.9±3.79 a 71.39 2573.9 3.75

Fig. 2

Concentration of crude protein in organs of purple sweet potato under different selenium treatments In each growing season, bars superscripted by different letters are significantly different at P < 0.05."

Fig. 3

Concentration of eight essential amino acids of humanbody in root tuber of purple sweet potato under different selenium treatments Bars superscripted by different letters are significantly different at P < 0.05."

Fig. 4

Concentration of ten nonessential amino acids of humanbody in root tuber of purple sweet potato under different selenium treatments Bars superscripted by different letters are significantly different at P < 0.05."

Table 4

Concentration of mineral elements in root tuber under different selenium treatments (mg kg-1)"

处理 K Na Ca Mg Fe Mn Zn Cu
CK 7642.3 b 3762.4 b 2970.8 a 1202.1 b 163.47 b 19.09 a 35.03 a 8.56 b
Se1 8184.4 b 3603.7 b 2693.8 b 1147.4 b 180.71 b 17.33 a 36.45 a 9.39 b
Se2 9475.7 a 4014.8 a 2410.0 b 1455.1 a 255.44 a 11.56 b 37.04 a 12.06 a
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