外源硒对苦荞生长发育及子粒硒含量的影响

为了研究外源硒对苦荞生长发育及子粒硒含量的影响,在开花期对大田苦荞喷施不同浓度亚硒酸钠（0、2.5、5.0、10.0和20.0mg/L）,分析在喷硒后5、10、15和35d地上部干生物量和鲜生物量、叶面积指数、叶绿素含量、产量及子粒硒含量的变化。结果表明：（1）在Se1（2.5mg/L）水平下外源硒能够显著提高苦荞地上部干和鲜生物量、叶面积指数、叶绿素含量;（2）在Se2（5.0mg/L）水平下能够显著提高苦荞产量,与对照相比,增幅为13.49%;（3）施硒可以显著提高苦荞子粒硒含量,子粒硒含量随喷施硒浓度的增加而增加,增幅为0.8%~4.2%。综上,适量外源硒能够促进苦荞生长发育,提高产量及子粒硒含量。

Effects of Exogenous Selenium on the Growth and Development of Tartary Buckwheat and Selenium Content in Grains

In order to study the effects of exogenous selenium on the growth and development of tartary buckwheat and selenium content in grains at the flowering stage, different concentrations of sodium selenite (0, 2.5, 5.0, 10.0, 20.0mg/L) were sprayed on the field of tartary buckwheat.The changes of dry biomass, leaf area index, chlorophyll content, yield and selenium content of the aboveground at 5, 10, 15 and 35d after spraying selenium were analyzed. The results showed: (1) Exogenous selenium can significantly increase the dry biomass, leaf area index and chlorophyll content of tartary buckwheat at Se1 (2.5mg/L) level; (2) At the level of Se2 (5.0mg/L), the yield of tartary buckwheat significantly increased by 13.49% compared with the control; (3) Selenium application increased the selenium content of tartary buckwheat grain, and the selenium content of tartary buckwheat grain increased with the increase of selenium concentration. In summary, an appropriate amount of exogenous selenium can promote the growth and development of tartary buckwheat, increase yield and selenium content of grain.