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采用温室砂培试验研究了不同氮素水平(5.0、7.5、10.01、5.01、7.5 mmol/L)对二年生库拉索芦荟生长和蒽醌、芦荟甙等次生代谢产物及硝酸盐含量的影响。结果表明,供氮水平由5.0 mmol/L增加到10.0 mmol/L,库拉索芦荟地上部产量和总生物量显著增加,继续提高氮水平芦荟地上部产量和总生物量没有显著增加;芦荟根干重及其根冠比则随着氮水平的增加而下降;叶片和根系的硝酸盐含量则随施氮浓度的提高呈增加趋势。供氮浓度从5.0mmol/L增加到10.0 mmol/L时,叶片的维生素C(Vc)含量显著增加,继续提高供氮水平,叶片Vc含量则明显下降;蒽醌含量则随施氮水平的上升而不断增大,但施氮10.0、15.0、17.5 mmol/L的处理间没有显著性差异。芦荟甙含量变化趋势和Vc含量相似,以施氮10.0 mmol/L为最高,其含量分别是其它处理的1.4、1.2、1.4、1.3倍。由此可见,芦荟在供氮10.0 mmol/L时能够获得较高的产量和蒽醌含量,较低的硝酸盐含量和高的Vc和芦荟甙含量,表明适宜的供氮水平是芦荟高产优质的保证。
The effects of different nitrogen levels (5.0, 7.5, 10.01, 5.01, 7.5 mmol / L) on the growth and the secondary metabolites such as anthraquinone and aloin and the nitrate content of Aloe vera were observed in a greenhouse sand culture experiment. The results showed that the nitrogen supply level increased from 5.0 mmol / L to 10.0 mmol / L, the aboveground and total biomass of Aloe vera increased significantly, The dry weight and root / shoot ratio decreased with the increase of nitrogen level. The nitrate content in leaves and roots increased with the increase of nitrogen application rate. When the concentration of nitrogen increased from 5.0 mmol / L to 10.0 mmol / L, the content of vitamin C (Vc) in leaves increased significantly and the level of nitrogen supply continued to increase while the content of Vc decreased significantly. The content of anthraquinones increased with the increase of nitrogen application However, there was no significant difference between treatments of 10.0, 15.0, 17.5 mmol / L nitrogen application. The trend of the content of aloin glycosides was similar to that of Vc. The content of N was 10.0 mmol / L and the content was 1.4,1.2,1.4,1.3 times of other treatments, respectively. Thus, Aloe can achieve higher yield and anthraquinone content, lower nitrate content and higher Vc and Aloin content when nitrogen supply is 10.0 mmol / L, indicating that suitable nitrogen supply level is high yield and quality of aloe Guarantee.