摘要
设置10和15 mmol·L-12个氮水平处理,NO3--N∶NH4+-N比例分别为1∶0、4∶1和1∶1的3个氮形态处理,水培紫叶生菜,研究其在LED红蓝组合光短期连续光照(SCL)后的品质提升效果.结果表明:各处理生菜地上部干质量在LED光源SCL处理后均显著提高,最小增幅为35.1%,根系干质量除NO3--N∶NH4+-N为1∶1且氮水平为15 mmol·L-1的处理和NO3--N∶NH4+-N为1∶0且氮水平为10 mmol·L-1的处理外,差异都达到显著水平.SCL处理前,不同氮营养处理生菜总酚、类黄酮相对含量差异不显著.SCL处理后,不同氮营养条件下生菜总酚、类黄酮和花青素相对含量差异显著.2种氮水平下,总酚和类黄酮相对含量随铵氮比例的提高而增加,花青素相对含量随铵氮比例增加而先降低后升高.SCL处理使生菜叶片、叶柄硝酸盐含量显著降低,其中叶片硝酸盐含量降低23.2%,生菜叶片抗坏血酸、可溶性糖和可溶性蛋白含量均显著提高.叶片硝酸盐含量降低速率随氮水平和铵氮比例的增加而提高.抗坏血酸含量增加速率主要受氮水平影响,氮水平较低时抗坏血酸含量增加速率较高.可溶性糖含量增加速率随着铵氮比例的增加而增加.SCL处理显著提高了不同氮营养水培生菜干物质的积累,同时显著降低了硝酸盐的积累,显著提高了抗坏血酸、可溶性糖和可溶性蛋白含量,氮营养条件对SCL改善生菜品质的速率有显著影响.
Purple lettuce was grown hydroponically under six different nitrogen nutrition conditions,with NO3--N： NH4＋-N at 1： 0,4： 1 and 1： 1 combined with nitrogen application levels of 10 and 15mmol·L^-1,for 25 days in solar greenhouse,then treated with short-term continuous lighting（ SCL） before harvest to study the changes in contents of nutrients and analyze the effects of nitrogen nutrition conditions on the changes. Results showed that the shoot dry mass of all six nitrogen nutrition conditions were significantly improved under SCL treatment,by 35. 1% at least,and the root dry mass increased greatly except for NO3--N： NH4＋-N 1： 1 combined with nitrogen application level 15 mmol·L^-1 treatment and NO3--N： NH4＋-N 1： 0 combined with nitrogen application level10 mmol·L^-1treatment. The relative contents of total phenols and flavonoid of different nitrogen nutrition conditions turned significantly different after treatment with SCL. The relative contents of total phenols and flavonoid were enhanced with the improvement of ammonium nitrogen ratio,while the re-lative content of anthocyanin increased and then decreased with the improvement of ammonium nitrogen ratio. The lighting treatment reduced the nitrate content of leaf blade of all six nitrogen nutrition conditions remarkably by 23. 2% at least. The contents of ascorbic acid,soluble sugar and soluble protein rose significantly under SCL treatments. The study showed that the reduction of nitrate content speeded up with the enhancement of nitrogen application level and ammonium nitrogen ratio,and the advancement of ascorbic acid content slowed down with the increasing nitrogen application level. The soluble sugar improvement speed increased with the increasing ammonium nitrogen ratio,and SCL lifted the dry mass of the lettuce greatly. The results showed that SCL with LED lamps improved significantly the dry matter of lettuce under different nitrogen nutrition conditions,reduced the nitrate content and increased the ascorbic acid,soluble suga
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第11期3361-3366,共6页
Chinese Journal of Applied Ecology
基金
国家高技术研究发展计划项目(2013AA103001)
新疆维吾尔自治区科技计划项目(201332103)资助
关键词
LED短期连续光照
氮水平
氮形态
水培生菜
营养品质
short-term continuous lighting with LED
nitrogen level
nitrogen form
hydroponic lettuce
nutritional quality
