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To elucidate the genetic basis of early flowering and the molecular mechanisms underlying floral regulation in plants of Rosaceae, this study selected Prunus campanulata, an early-flowering ornamental plant endemic to East Asia, as the target species. Genome-wide comparison, phylogenetic analysis, conserved motif and cis-acting element prediction, weighted gene co-expression network analysis (WGCNA) were employed to characterize the PEBP gene family and its role in floral induction. The results revealed that the member composition and motif structure of the PEBP gene family in P. campanulata were highly conserved compared with those in related species, and no significant positive selection was detected based on branch-site models, indicating a lack of functional divergence among family members. Expression profiling showed that PcamFT gene exhibited high tissue-specific expression in floral organs. Promoter analysis indicated an enrichment of light-responsive G-box elements and the absence of AE-box and GT1 repressive elements, suggesting its transcriptional regulation may be highly responsive to photoperiodic signals. WGCNA identified 33 co-expression modules, among which the module 25 showed the strongest positive correlation with floral tissue. PcamFT gene was assigned to this module and was co-expressed with several core MADS-box floral regulators, including AP1, SEP3, and AGL1. Protein-protein interaction analysis indicated that PcamFT gene may interact with these transcription factors to form regulatory complexes that promoted floral meristem identity establishment and organ differentiation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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