%0 Journal Article
%T Changes in and correlation analysis of quality indices of hydroponic lettuce under short-term continuous light<br>短期连续光照下水培生菜品质指标变化及其关联性分析
%A ZHOU Wan-Lai
%A LIU Wen-Ke
%A WEN Jing
%A YANG Qi-Chang
%A <br>周晚来
%A 刘文科
%A 闻婧
%A 杨其长
%J 中国生态农业学报
%D 2011
%I 
%X Nitrate easily accumulates in vegetables (especially leaf vegetables) and poses serious health hazard if excessively ingested. Light is a critical environmental factor influencing plant nitrate content. In this study, changes in contents of nitrate, soluble sugar and vitamin C (Vc) in hydroponic lettuce under 72 h continuous light and their correlation were analyzed. The aim of the study was to explore quality control measures of vegetables grown in controlled environments. The study showed that nitrate content in both leaf blade and petiole decreased significantly with variational rate in different time. Nitrate content in blade and petiole tended to steady after 24 h and 48 h continuous light respectively, while soluble sugar and Vc contents increased rapidly at a roughly constant rate and showed little trend of slowing down. There was no significant difference between blade and petiole soluble sugar contents. However, blade Vc content was much higher than that in petiole. Both in blade and petiole, nitrate content was significantly negatively correlated with soluble sugar and Vc contents. The results showed that short-term exposing to continuous illumination was suited to produce high quality lettuce with perfect unity of low nitrate accumulation and high soluble sugar and Vc contents.
%K Continuous light
%K Lettuce
%K Petiole
%K Leaf blade
%K Nitrate
%K Soluble sugar
%K Vitamin C<br>连续光照
%K 生菜
%K 叶柄
%K 叶片
%K 硝酸盐
%K 可溶性糖
%K 维生素C
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=989DEC55471BE8FA311525C6B15E8F7D&yid=9377ED8094509821&vid=2A8D03AD8076A2E3&iid=B31275AF3241DB2D&sid=80428A5C4056DF37&eid=9F0564033BABD14F&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=26