Plant Diversity ›› 2022, Vol. 44 ›› Issue (04): 417-427.DOI: 10.1016/j.pld.2021.12.001

• Articles • Previous Articles    

Metabolome profiling of stratified seeds provides insight into the regulation of dormancy in Davidia involucrata

Shiming Denga,b, Qiang Xiaoa, Cigui Xua, Jian Honga, Zhijun Denga, Dan Jianga, Shijia Luoa   

  1. a Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, Hubei Minzu University, Enshi 445000, Hubei Province, China;
    b Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
  • Received:2021-08-17 Revised:2021-11-20 Online:2022-07-25 Published:2022-08-13
  • Contact: Shijia Luo,
  • Supported by:
    This work was funded by the National Natural Sciences Foundation of China (31460203, 31860073) and Research Center for Germplasm Engineering of Characteristic Plant Resources in Enshi Prefecture (2019e2021). Hubei Key Laboratory of Biological Resources Protection and Utilization (PT012204).

Abstract: Dove tree (Davidia involucrata), a tertiary vestige species, is well-adapted to cool conditions. Dormancy in D. involucrata seed lasts for an extremely long period of time, typically between 3 and 4 years, and this characteristic makes the species an excellent model for studying the mechanisms of seed dormancy. The molecular mechanisms governing germination control in D. involucrata are still unknown. Seed stratification have been reported to enhance germination in recalcitrant seeds. We performed a widely targeted metabolome profiling to identify metabolites and associated pathways in D. involucrata seeds from six different moist sand stratification durations (0-30 months) using the ultra-high-performance liquid chromatography-Q Exactive Orbitrap-Mass spectrometry. There was an increasing germination rate with prolonged stratification durations (12-30 months). Furthermore, we detected 10,008 metabolites in the stratified seeds. We also detected 48 differentially accumulated metabolites (DAMs) between all stratification periods in the seeds, with 10 highly conserved metabolites. Most of the differentially accumulated metabolites between unstratified and stratified seeds were enriched in purine metabolism, pyrimidine metabolism, flavone and flavonol biosynthesis, phenylpropanoid biosynthesis, and arginine biosynthesis pathways. Key phytohormones, abscisic acid, indole-3 acetic acid, and sinapic acid were differentially accumulated in the seeds and are predicted to regulate dormancy in D. involucrata. We have provided extensive metabolic information useful for future works on dove tree germination study.

Key words: Dove tree, Metabolome, Dormancy, Abscisic acid, Stratification