不同光强下红蓝光配比对樱桃萝卜生长与产量的影响

采用LED光源在室内可控环境下设置3种光照强度（180、240、300μmol·m^-2·s^-1）和2种红蓝光配比（1R:1B、2R:1B），以研究不同光强和红蓝光配比组合对樱桃萝卜真叶数、叶绿素含量、肉质根形态以及干鲜重的影响。结果表明，光强为180μmol·m^-2·s-1时，2R:1B处理的新叶叶绿素含量略高于1R:1B处理，但地上部鲜重却略低于1R:1B处理，其它生长指标不同光质处理间无显著差异。光强为240μmol·m^-2·s^-1时，相比1R:1B 处理，2R:1B处理显著提高了樱桃萝卜的新叶叶绿素含量、地上部干鲜重、根直径、根体积、肉质根干鲜重以及干鲜根冠比（P＜0.05）。光强300μmol·m^-2·s^-1时，2R:1B处理的新叶叶绿素含量略低于1R:1B处理，但地上部干鲜重显著高于1R:1B处理（P＜0.05），其它指标无显著差异。相同红蓝光配比下，樱桃萝卜新叶叶绿素含量、根直径、根体积、肉质根干鲜重及根冠比均随着光强的增加而增加。地上部干鲜重随光强增加的变化因光质而异。总之，一定强度的LED红蓝光质是植物工厂樱桃萝卜高产的光环境基础，并且光强高于一定水平时适宜的红蓝光配比对其生长具有显著促进作用。

Effects of Red/Blue Light Ratio with Different Light Intensity on Growth and Yield of Cherry Radish

Two light quality treatments of various red/blue light ratios (1R:1B and 2R:1B) and three light intensity (180, 240, 300μmol·m^-2·s^-1) treatments were designed to investigate the effects of red/blue light ratio and light intensity on growth and yield of cherry radish grown in environmentally-controlled chamber with LED light source. The results showed that light quality of 2R:1B presented higher new leafy chlorophyll content and lower shoot fresh weight than 1R:1B when cherry radish grown under 180μmol·m^-2·s^-1. But there were no significant differences in other growth indices between two red/blue light ratio treatments. 2R:1B treatment significantly improved new leafy chlorophyll content, fresh and dry weight of shoot and root, root diameter, root volume and root to shoot ratio compared with 1R:1B under 240μmol·m^-2·s^-1. When light intensity was 300μmol·m^-2·s^-1, 2R:1B treatment had slightly lower new leafy chlorophyll content and slightly higher fresh and dry weight of shoot. Under the same red/blue light ratio, the new leafy chlorophyll content, root diameter and fresh, dry weight of root increased with the increment in light intensity. The variation of shoot fresh and dry weight with light intensity depend on light quality. To conclude, suitable light quality and light intensity level are basis for high-efficient production of cherry radish, and appropriate red/blue light ratio could improve the growth of cherry radish significantly when light intensity above a certain value.