Diversity in genome size and GC content shows adaptive potential in orchids and is closely linked to partial endoreplication, plant life-history traits and climatic conditions.

摘要: In angiosperms, genome size and nucleobase composition (GC content) exhibit pronounced variation with possible adaptive consequences. The hyperdiverse orchid family possessing the unique phenomenon of partial endoreplication (PE) provides a great opportunity to search for interactions both genomic traits evolutionary history family. Using flow cytometry, we report values type 149 species compare these suite life-history climatic niche data using phylogeny-based statistics. evolution was further studied Brownian motion (BM) Ornstein-Uhlenbeck (OU) models access their potential. Pronounced in (341-54 878 Mb), especially GC content (23.9-50.5%), detected among orchids. Diversity closely related endoreplication, plant growth form conditions. also associated dormancy. all tested scenarios, OU always outperformed BM models. Unparalleled discovered orchids, setting new limits plants. Our study indicates that diversity has consequences is tightly linked transitions PE.