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Reaching Natural Growth: Light Quality Effects on Plant Performance in Indoor Growth Facilities

机译：达到自然增长：室内增长设施中植物性能的轻质质量影响

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To transfer experimental findings in plant research to natural ecosystems it is imperative to reach near to natural-like plant performance. Previous studies propose differences in temperature and light quantity as main sources of deviations between indoor and outdoor plant growth. With increasing implementation of light emitting diodes (LED) in plant growth facilities, light quality is yet another factor that can be optimised to prevent unnatural plant performance. We investigated the effects of different wavelength combinations in phytotrons (i.e., indoor growth chambers) on plant growth and physiology in seven different plant species from different plant functional types (herbs, grasses and trees). The results from these experiments were compared against a previous field trial with the same set of species. While different proportions of blue (B) and red (R) light were applied in the phytotrons, the mean environmental conditions (photoperiod, total radiation, red to far red ratio and dayight temperature and air humidity) from the field trial were used in the phytotrons in order to assess which wavelength combinations result in the most natural-like plant performance. Different plant traits and physiological parameters, including biomass productivity, specific leaf area (SLA), leaf pigmentation, photosynthesis under a standardised light, and the respective growing light and chlorophyll fluorescence, were measured at the end of each treatment. The exposure to different B percentages induced species-specific dose response reactions for most of the analysed parameters. Compared with intermediate B light treatments (25 and/or 35% B light), extreme R or B light enriched treatments (6% and 62% of B respectively) significantly affected the height, biomass, biomass allocation, chlorophyll content, and photosynthesis parameters, differently among species. Principal component analyses (PCA) confirmed that 6% and 62% B light quality combinations induce more extreme plant performance in most cases, indicating that light quality needs to be adjusted to mitigate unnatural plant responses under indoor conditions.
机译：转移植物研究中的实验结果对天然生态系统的研究，迫切靠近天然的植物性能。以前的研究提出了温度和光量的差异作为室内和室外植物生长之间的偏差的主要来源。随着植物生长设施中的发光二极管（LED）的实施增加，光质质量是可以优化的另一个因素，以防止不自然的工厂性能。我们调查了不同植物功能类型（草药，草和树木）的七种不同植物种类的植物生长和生理学中不同波长组合的影响。将这些实验的结果与相同一组物种的先前的实地试验进行了比较。虽然在植入植物四（b）和红色（r）光的不同比例的蓝色（b）和红色（r）光中，使用了现场试验中的平均环境条件（光周期，总辐射，红色到远的红色比率和日/夜温度和空气湿度）在植入植物中，以评估哪些波长组合导致最自然的植物性能。在每种处理结束时测量不同植物性状和生理学参数，包括生物质生产率，特异性叶面积（SLA），叶子色素沉着，光合作用，以及各自的生长光和叶绿素荧光。暴露于不同的B百分比诱导物种特异性剂量反应，大部分分析的参数。与中间B光处理（25和/或35％B光）相比，极端R或B光疗治疗（分别为6％和62％）显着影响高度，生物质，生物质分配，叶绿素含量和光合作用参数，不同的物种之间。主成分分析（PCA）证实，在大多数情况下，6％和62％的B光质组合在大多数情况下诱导更极端的植物性能，表明需要调整光质以减轻室内条件下的不自然植物响应。

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