红蓝光质对香椿芽苗菜营养品质的影响

以发光二极管（LED）精量调制光质（红光、蓝光和红蓝混合光），以白光（普通日光灯）为对照，研究红蓝光质对香椿芽苗菜营养品质（氨基酸、维生素C、硝酸盐、粗纤维、总黄酮、单宁）的影响。结果表明：与白光相比，蓝光和红蓝光处理显著提高了香椿芽苗菜氨基酸含量，而红光处理降低了香椿芽苗菜氨基酸含量；3种光质均有利于香椿芽苗菜维生素C 的形成和累积，其促进作用大小依次为蓝光＞红光＞红蓝混合光；各处理均抑制香椿芽苗菜硝酸盐的累积，其中红光的抑制作用最强；红光处理可提高香椿芽苗菜的粗纤维含量，而蓝光处理则降低香椿芽苗菜粗纤维含量；与对照相比，蓝光和红蓝混合光处理提高了香椿芽苗菜总黄酮的含量，同时降低了香椿芽苗菜单宁的含量。总之，蓝光和红蓝混合光处理可提高氨基酸、维生素C、总黄酮含量，同时可降低硝酸盐、粗纤维和单宁含量。因此，蓝光和红蓝混合光处理更有利于提高香椿芽苗菜品质。

Effects of Red and Blue Spectra on Nutritional Quality of Toona sinensis Seedlings

Red light(RL), blue light(BL), red+blue light(R/BL) generated by light-emitting diode were applied, and white light(WL) generated by fluorescent lamps was used as control. The authors studied the effects of different light qualities on nutritional quality (amino acids, Vc, nitrate, crude fiber, total flavonoid and tannin) of Toona sinensis sprouts. The results showed that the treatments of BL and R/BL increased significantly amino acid content of Toona sinensis seedlings compared with the white light treatment, while the RL had the opposite effect. The three spectral quality treatments had the superiority in promoting synthesis and accumulation of Vc in Toona sinensis seedlings, the increase in turn were BL>RL>R/BL. The three treatments of light quality inhibited the accumulation on nitrate of Toona sinensis seedlings, and the strongest inhibition was RL treatment. The crude fiber content of Toona sinensis seedlings was raised under RL, but reduced under BL. Compared with the control, BL and R/BL treatments increased the total flavonoid content of Toona sinensis seedlings, while also reduced the content of tannin. To summarize, BL and R/BL treatments could raise amino acids, Vc and total flavonoid of Toona sinensis seedlings, and could reduce the content of nitrate, crude fiber and tannin at the same time. Therefore, BL and R/BL light could promote nutritional quality of Toona sinensis seedlings.