外源硒对谷子生理特性、硒含量及其产量和品质的影响

doi:10.3864/j.issn.0578-1752.2017.01.005

Abstract

Abstract: 【Objective】At different growth stages of the foxtail millet, selenium was sprayed at different concentrations to study the change rule of millet yield components, quality, protective enzyme activity and grain selenium content to determine the optimum amount of selenium and spraying period for foxtail millet, so as to provide a theoretical basis for production of selenium-rich foxtail millet. 【Method】The varieties Changnong35, Jigu20 and Jingu50 were used as test materials, and 6 selenium concentrations were designed, 0 Na₂SeO₃ (T0), 16.96 g·hm^-2 Na₂SeO₃ (T1), 33.92 g·hm^-2 Na₂SeO₃ (T2), 67.84 g·hm^-2 Na₂SeO₃(T3), 135.68 g·hm^-2 Na₂SeO₃ (T4), 271.36 g·hm^-2 Na₂SeO₃ (T5). Study on influence of selenium levels on different stages of different millet varieties physiological and biochemical indexes, yield, quality and the content of selenium, spraying in seedling stage, heading stage and filling stage. 【Result】The different development stages of the different concentration of exogenous selenium foliar treatment millet, SPAD, POD, SOD, MDA, GSH and GSH-Px 6 physiological and biochemical indexes difference reached extremely significant level among varieties (P＜0.01). In addition to the MDA, other physiological indexes increase at first and then descend with the Se concentration increasing, reached the maximum when selenium concentrations T3. The activity of SOD, POD and GSH-Px, the content of GSH and SPAD values respectively after spraying treatment and compared with the control increased by 11.8%, 44%, 94%, 97.4% and 9% more than CK under heading spraying. Exogenous selenium can significantly improve the millet grain selenium content, and spraying at different time, different varieties increased with spraying selenium concentrations increased. Spraying time impact on grain selenium content in filling stage＞heading stage＞seedling stage, filling stage spraying influence on selenium content of different varieties Jingu50＞Changnong35＞Jigu20. Filling stage T3 treatment, Jingu50 grain selenium content reached 0.297 mg·hm^-2, which was increased by 8.6 times compared to the CK within the scope of the safety of the intake of selenium. Foliar spraying selenium can improve crude protein, lysine, and folic acid content of the foxtail millet, different spraying period different millet varieties T3 treatment of crude protein, lysine and folic acid content is the highest, compared with the control increased by 13.9%, 17.9% and 7.5%. Different concentration of selenium can improve millet production at T3 treatment achieve maximum, increase first and then decrease with selenium concentrations increased. Heading spraying T3 selenium concentration, production of Jingu50, Jigu20 and Changnong35 compared with the control respectively increased by 4.9%, 4.7% and 1.2%. 【Conclusion】The right amount of exogenous selenium on foxtail millet can play a significant role in promoting physiological characteristics, quality and production, Se-rich millet production prospects. At heading stage spraying sodium selenite at 67.84 g·hm^-2is an optimal concentration and best period of millet foliar spraying selenium.

Key words: foxtail millet, grain selenium content, yield, physiological indexes, quality indexes

MU TingTing, DU HuiLing, ZHANG FuYao, JING XiaoLan, GUO Qi, LI ZhiHua, LIU Zhang, TIAN Gang. Effects of Exogenous Selenium on the Physiological Activity, Grain Selenium Content, Yield and Quality of Foxtail Millet[J].Scientia Agricultura Sinica, 2017, 50(1): 51-63.

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