烟促种子萌发研究新进展

Advances in research on smoke-promoted seed germination

野火是全球陆地生态系统植被更新的重要驱动力,野火伴生的烟气含有多种活性化合物,可以促进火后植物的种子萌发。传统观点认为,烟气中普遍含有纤维素热解产生的Karrikin类物质,是促进火后种子萌发的主要烟信号化合物。最新研究发现,木质素热解产生的丁香醛也可以促进火后植物的种子萌发。本文综述了烟信号化合物的发现历程,阐释了烟信号化合物与植物火后更新的生态相关性,并对植物烟信号适应性的演化进行了探讨。在此基础上,本文提出了烟促种子萌发研究领域仍待解答的一些科学问题,并对本领域的未来研究方向进行了展望。

Fire is an important driver of plant regeneration in global terrestrial ecosystems.Post-fire seed germina-tion is a critical adaptive feature of plants in fire-prone environments.Smoke produced by pyrolysis of plant materi-als in wildfire contains various active chemical compounds,which can activate soil seed bank via initiating post-fire seed germination.Karrikins produced by cellulose pyrolysis are usually considered as the primary smoke cue that promotes seed germination.Recently,it has been found that lignin-promoted syringaldehyde can also trigger seed germination of post-fire plants.Here,we review the history of research on smoke cues and their ecological relevance to post-fire plant regeneration,and discuss the evolutionary aspects of smoke adaptation of plants.On basis of these discussions,we propose some important scientific questions about smoke-promoted seed germination to get some perspective on future research.