昼夜连续照射LED红蓝光对不同品种生菜生长和品质的影响

doi:10.3969/j.issn.1000-6362.2018.07.003

摘要/Abstract

摘要： 为探究生菜对全生长期连续光照的响应及品种差异性，在密闭式植物工厂内，以LED红蓝光为光源研究了水培条件下常规光照（12h/12h，NL）与连续光照（24h/0h，CL）对5种生菜生长和品质的影响。结果表明：与常规光照（NL）处理相比，连续光照（CL）处理显著提高了除“大卫”外其它4种生菜的地上部鲜重，其中“绿罗”生菜增加幅度最高。生长初期连续光照（CL）处理下5种生菜叶片叶绿素含量显著高于常规光照（NL）处理，但在生长后期，5种生菜两个处理下的叶绿素含量均无显著差异。与常规光照处理相比，连续光照处理显著提高了5种生菜可溶性糖、总酚和类黄酮含量，以及其中2种紫叶生菜的花青素含量。除“绿罗”外，其它4个品种连续光照处理下的抗坏血酸总量均略有或显著升高，其中主要提高了还原型抗坏血酸的含量，对脱氢抗坏血酸含量的影响不显著。总之，全生长期连续光照能显著提高生菜的产量，促进可溶性糖和抗氧化物质合成；5个品种生菜对连续光照的适应性存在差异，其中“绿罗”的适应性最强；全生长期连续光照运用于植物工厂生菜生产对提高产量和品质的潜力较大。

关键词: 光周期, 叶色, 生物量, 抗氧化物质, 抗坏血酸, LED

Abstract: In order to explore lettuce responses to whole growth period continuous light and diverse responses among cultivars, an experiment was conducted in an environmentally-controlled plant factory equipped with red plus blue LED lamps to investigate the effects of normal lighting (12h/12h, 6：00?18：00, NL) and continuous lighting (24h/0h, 6：00?6：00, CL) on the yield and quality of five hydroponic lettuce cultivars. The results showed that the shoot fresh weights of five lettuce cultivars except ‘Dawei’ cultivar were significantly improved under CL treatments compared with NL treatment. ‘Lvluo’ cultivar showed the greatest amplification among five cultivars. At early growth stage, the leaf chlorophyll contents of five cultivars grown under CL were significantly higher than those grown under NL. While no significant difference of five cultivars’ leaf chlorophyll contents was observed between NL and CL treatments at harvest. Compared to NL treatment, CL treatment significantly increased the soluble sugar, total phenolic and flavonoid contents of five cultivars and anthocyanin contents of two purple cultivars.CL treatment slightly or significantly increased total ascorbic acid content of all lettuce cultivars except ‘Lvluo’ cultivar, and mainly increased in reduction state. CL had no significant effect on dehydroascorbic acid of five cultivars. In short, CL could significantly enhance the yield and biosynthesis of soluble sugar and antioxidant substance. The adaptability of five lettuce cultivars to CL was different, and ‘Lvluo’ cultivar was the most adaptable cultivar. CL during whole growth period has the potential to enhance yield and quality of lettuce in plant factory production.

Key words: Photoperiod, Leaf color, Biomass, Antioxidant substances, Ascorbic acid, LED

查凌雁，刘文科. 昼夜连续照射LED红蓝光对不同品种生菜生长和品质的影响[J]. 中国农业气象, 2018, 39(07): 453-461.

ZHA Ling-yan, LIU Wen-ke. Effect of Continuous Light with Blue and Red LED on Growth and Quality of Different Lettuce Cultivars[J]. Chinese Journal of Agrometeorology, 2018, 39(07): 453-461.

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