Influence of Temperature and LED Light Spectra on Flavonoid Contents in Poa pratensis

Andreas Schweiger, Heinz Bernhardt
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Abstract

Light and temperature are the driving forces in plant development and growth. Specific photoreceptors provide the ability to sense and interpret light and temperature to regulate growth. Under the limited light conditions in most sports stadiums, natural grasses suffer from light deficiency. Artificial light provided by light-emitting diodes (LEDs) is used to increase their growth and adjust their development. Flavonoids like flavonols and anthocyanins are influenced by light conditions and temperature. Increased blue light can elevate the content of these secondary metabolites. Remote measurements of internal parameters using non-destructive methods provided information on their content under different temperature conditions for quality monitoring. This experiment tested flavonoid contents in Kentucky bluegrass (Poa pratensis) for different blue-to-red light ratios (0.6 and 0.4) and three temperature courses (constant temperature of 4 °C, constant temperature of 12 °C, and temperature switching among 12–8–4–8–12 °C). The results show elevated levels of flavonoids under blue-dominant artificial light as well as increased content under low-temperature (4 °C) conditions. The lack of flavonoids at elevated temperatures (12 °C), especially under red-dominant light, suggests an increased requirement for artificial blue light at increased temperatures. Non-destructive flavonoid determination was suitable for this experiment and can therefore be used for practical sports turf quality monitoring.
温度和 LED 光光谱对 Poa pratensis 中黄酮类化合物含量的影响
光照和温度是植物发育和生长的驱动力。特定的感光器能够感知和解读光照和温度,从而调节生长。在大多数体育场馆有限的光照条件下,天然草坪会出现光照不足的问题。利用发光二极管(LED)提供的人造光可以提高草的生长速度,调节草的发育。黄酮类化合物(如黄酮醇和花青素)受光照条件和温度的影响。增加蓝光可提高这些次生代谢物的含量。使用非破坏性方法对内部参数进行远程测量,可提供不同温度条件下的含量信息,以便进行质量监测。本实验测试了肯塔基蓝草(Poa pratensis)在不同蓝红光比(0.6 和 0.4)和三种温度条件(恒温 4 °C、恒温 12 °C、12-8-4-8-12 °C)下的类黄酮含量。结果表明,在蓝光为主的人工光照条件下,类黄酮的含量升高,而在低温(4 °C)条件下,类黄酮的含量也有所增加。在高温(12 °C)条件下,尤其是在红光条件下,黄酮类化合物的含量不足,这表明在温度升高时对人工蓝光的需求增加。非破坏性类黄酮测定适用于本实验,因此可用于实际的运动草坪质量监测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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