光质对菠菜草酸、单宁及硝酸盐积累效应的影响

Effects of light qualities on accumulation of oxalate,tannin and nitrate in spinach

用彩色荧光灯得到红光、蓝光和黄光,以白光为对照,研究不同光质对菠菜产量,草酸、单宁及硝酸盐积累的影响。结果表明,处理间的菠菜叶柄和叶片硝酸盐和草酸含量的变化不同,但地上部生长量的变化趋势相同。叶片占植株地上部鲜质量的比例高于叶柄。不同处理叶片和叶柄鲜质量依次为白光(对照)>黄光>红光>蓝光。红光处理有利于干物质和碳水化合物的形成与积累。菠菜叶柄的硝酸盐含量显著高于叶片,是积累硝酸盐的主要场所,并且各处理间叶片硝酸盐和单宁含量的差异远大于叶柄。白光和黄光处理下,菠菜叶片草酸含量大于叶柄,而红光和蓝光处理则相反,其中红光处理草酸含量最低。菠菜在红光处理下生物量虽不高,但可极大地降低硝酸盐和草酸含量,提高菠菜品质。

Red light（RL）, blue light（BL） and yellow light （YL）were obtained from fluorescent lamp lights. With the same intensity of white light （WL） as control, the effects of light quality on biomass, oxalate, tannin and nitrate accumulation in spinach were studied. The results showed that changes of nitrate and oxalate contents were different in petiole and leaf blade among various treatments, while the trends of plant growth increment were the same. Leaf blade had more proportion than petiole in fresh weight. Under different qualities, the increase of leaf blade and petiole fresh weight in turn were WL（CK）〉YL〉RL〉BL. RL was better to the formation and accumulation of dry matter and carbohydrate. Nitrate concentration in petiole was significantly higher than that in leaf blade. The petiole was the dominant place for nitrate accumulation, and the variation of nitrate concentrations in leaf blade was significantly higher than that in petiole. The oxalate content in leaf blade was higher than that in petiole under WL and YL treatments, but it was opposite under RL and BL treatments. And the total oxalate content of RL treatment was the lowest. Although spinach biomass was lower under RL treatment, the nitrate and total oxalate contents could be reduced obviously. The quality of spinach was improved by RL treatment.