Abstract：
Phytoremediation has become famous for removing particulate matter (PM) and volatile organic compounds (VOCs), but the ability is affected by plant health. Lately, the priming technique was a simple approach to studying improving plant tolerance against abiotic stress by specific metabolites that accumulated, known as \"memory\", but the mechanism underlying this mechanism and how long this \"memory\" was retained in the plant was a lack of study. Sansevieria trifasciata was primed for one week for PM and VOC stress to improve plant efficiency on PM and VOC. After that, the plant was recovered for two- or five-weeks, then re-exposed to the same stress with similar PM and VOC concentrations from cigarette smoke. Primed S. trifasciata showed improved removal of PMs entirely within 2 h and VOC within 24 h. The primed plant can maintain a malondialdehyde (MDA) level and retain the \"memory\" for two weeks. Metabolomics analysis showed that an ornithine-related compound was accumulated as a responsive metabolite under exposure to PM and VOC stress. Exogenous ornithine can maintain plant efficiency and prevent stress by increasing proline and antioxidant enzymes. This study is the first to demonstrate plant \"memory\" mechanisms under PM and VOC stress.
摘要：
植物修复已成为著名的去除颗粒物（PM）和挥发性有机化合物（VOCs），但是这种能力受到植物健康的影响。最近,启动技术是一种简单的方法，用于研究通过积累的特定代谢物来提高植物对非生物胁迫的耐受性，被称为“记忆”，但是这种机制的潜在机制以及这种“记忆”在植物中保留的时间是缺乏研究的。三片三片sansevieria被灌注了一周的PM和VOC胁迫，以提高植物对PM和VOC的效率。之后,植物恢复了两到五周，然后再次暴露于相同的压力与香烟烟雾中相似的PM和VOC浓度。引发的S.trifasciata显示出改善的PM在两个小时内完全去除和VOC在24小时内。引发的植物可以保持丙二醛（MDA）水平，并保持“记忆”两周。代谢组学分析表明，在暴露于PM和VOC胁迫下，鸟氨酸相关化合物作为响应性代谢产物积累。外源鸟氨酸可以通过增加脯氨酸和抗氧化酶来维持植物效率并防止胁迫。这项研究首次证明了植物在PM和VOC胁迫下的“记忆”机制。
