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Functional growth, photosynthesis and nutritional property analyses of lettuce grown under different temperature and light intensity
The Journal of Horticultural Science and Biotechnology ( IF 1.9 ) Pub Date : 2020-08-26 , DOI: 10.1080/14620316.2020.1807416
Zheng Chen 1 , Mohammad Shah Jahan 1, 2 , Pengpeng Mao 3 , Mengmeng Wang 3 , Xiaoying Liu 3 , Shirong Guo 1
Affiliation  

ABSTRACT There is a growing interest in the impact of light intensity and temperature on vegetable growth and dietary quality characteristics. Lettuce (Lactuca sativa L.), as one of the model vegetables in plant factories, was grown under two light levels (G1: 160 µmol m–2 s–1, G2: 200 µmol m–2 s–1) with different day/night temperatures (T1: 20 ± 1°C/15 ± 1°C, T2: 24 ± 1°C/19 ± 1°C) to investigate mutual effects of light intensity and temperature on its growth and quality properties. The results revealed that the T2G2 treatment showed higher plant height, biomass and net photosynthetic rate, while T1G2 resulted in decreased leaf area and lower maximum photochemical efficiency of photosystem II (Fv/Fm) compared to T1G1. Simultaneous increases in light intensity and temperature based on T1G1 significantly increased the contents of anthocyanin, vitamin C (Vc) and soluble protein by 58%, 21% and 172%, respectively. The higher light intensity promoted the nutritional values of lettuce, characterised by lower nitrate level and soluble protein contents. Principal component analysis showed a negative collinearity between the nitrate content and soluble protein and Vc contents. In conclusion, light intensity and temperature co-regulated the lettuce’s growth and development, and their simultaneous increases better for growth and nutritional values of lettuce. These results provide a better understanding of the cultivation of plants in an artificial plant factory while maintaining yield and quality.

中文翻译:

不同温度和光照条件下生菜的功能生长、光合作用及营养特性分析

摘要 光照强度和温度对蔬菜生长和膳食质量特性的影响越来越受到关注。生菜(Lactuca sativa L.)作为植物工厂的示范蔬菜之一,在两种光照水平(G1:160 µmol m–2 s–1,G2:200 µmol m–2 s–1)下种植不同天数/夜间温度(T1:20±1°C/15±1°C,T2:24±1°C/19±1°C)研究光照强度和温度对其生长和质量特性的相互影响。结果表明,与T1G1相比,T2G2处理显示出更高的株高、生物量和净光合速​​率,而T1G2导致叶面积减少和光系统II的最大光化学效率(Fv/Fm)降低。基于T1G1的光强和温度的同时增加显着增加了花青素的含量,维生素 C (Vc) 和可溶性蛋白质分别增加了 58%、21% 和 172%。较高的光照强度提高了生菜的营养价值,其特点是硝酸盐水平和可溶性蛋白质含量较低。主成分分析显示硝酸盐含量与可溶性蛋白质和 Vc 含量之间呈负共线性。总之,光照强度和温度共同调节生菜的生长和发育,并且它们同时增加更好地促进生菜的生长和营养价值。这些结果提供了更好地了解在保持产量和质量的同时在人工植物工厂中种植植物的情况。以较低的硝酸盐含量和可溶性蛋白质含量为特征。主成分分析显示硝酸盐含量与可溶性蛋白质和 Vc 含量之间呈负共线性。总之,光照强度和温度共同调节生菜的生长和发育,并且它们同时增加更好地促进生菜的生长和营养价值。这些结果提供了更好地了解在保持产量和质量的同时在人工植物工厂中种植植物的情况。以较低的硝酸盐含量和可溶性蛋白质含量为特征。主成分分析显示硝酸盐含量与可溶性蛋白质和 Vc 含量之间呈负共线性。总之,光照强度和温度共同调节生菜的生长和发育,并且它们同时增加更好地促进生菜的生长和营养价值。这些结果提供了更好地了解在保持产量和质量的同时在人工植物工厂中种植植物的情况。
更新日期:2020-08-26
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