Selecting suitable plant species is important in urban greening because urban environments often provide unfavorable conditions for plant growth. We focused on delayed fluorescence (DF), i.e., light emitted from plants immediately following light exposure as a result of back electron transfer in photosynthesis, as an indicator of photosynthetic activity. Moss greening, urban greening using bryophytes, has attracted attention as a new domain of greening that does not require soil. Therefore, tolerance to drying, which is a characteristic environmental factor in cities, of four bryophytes—Bryum argenteum Hedw., Racomitrium japonicum Dozy et Molk., Hypnum plumaeforme Wilson, and Polytrichum commune Hedw.—was evaluated in the laboratory using DF. Assuming an urban environment, experiments were performed to measure the transition of DF following the cessation of irrigation and re-watering. The recovery of accumulated DF values (0–200 s) by rehydration 8 days after irrigation cessation was increased in the order H. plumaeforme ≈ P. commune < R. japonicum < B. argenteum. B. argenteum presented an increase in the accumulated amount of DF 8 h after irrigation cessation, and presented a significantly higher DF when compared with the other three species at 16 h. Together with results of previous studies, these findings of desiccation tolerance in the studied species indicate that DF is a useful method for characterizing desiccation tolerance in plants and selecting potentially useful plants for urban greening.

中文翻译：

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延迟荧光作为城市绿化植物物种筛选的新方法：使用四种苔藓植物的实验研究

选择合适的植物物种在城市绿化中很重要，因为城市环境通常为植物生长提供不利条件。我们专注于延迟荧光（DF），即由于光合作用中的反向电子转移而在受光后立即从植物发出的光，作为光合作用活性的指标。作为苔藓植物的城市绿化，苔藓绿化作为不需要土壤的新的绿化领域引起了人们的关注。因此，四种苔藓植物–阿根廷黑麦（Bryum argenteum Hedw。），日本杜鹃（Racomitrium japonicum Dozy）和莫尔克（Molk）的耐旱性是城市中的一个典型环境因素。，Hypnum plumaeforme Wilson和Polytrichum communeHedw。-在实验室中使用DF进行了评估。假定城市环境，进行了实验以测量灌溉和补水停止后DF的转化。积累的DF值（0-200多个）由补液灌溉停止后8天恢复的顺序增加H. plumaeforme  ≈ 青霉 <  R.血吸虫 <  B. argenteum。阿根廷双歧杆菌在停止灌溉后8小时，DF的累积量增加，并且与其他三个物种相比，在16小时时的DF显着提高。与以前的研究结果一起，在所研究物种中的耐干燥性的这些发现表明，DF是表征植物中耐干燥性和选择可能有用的植物用于城市绿化的有用方法。