Hybridization boosters diversification in a Neotropical Bulbophyllum (Orchidaceae) group

Area of Science:

• Genomics
• Orchid Taxonomy
• Evolutionary Biology

Background:

• Hybridization and introgression are widespread evolutionary processes, yet understudied in the speciose Bulbophyllum orchid genus.
• Only four natural Bulbophyllum hybrids are currently recognized, primarily based on morphological data.

Purpose of the Study:

• To investigate the hybrid status of two Neotropical Bulbophyllum species using genomic evidence.
• To evaluate the impact of hybridization on parental species genomes.
• To assess hybridization between the recently diverged sister species B. involutum and B. exaltatum.

Main Methods:

• Utilized next-generation sequencing data.
• Applied model-based analysis to three systems involving putative parental species and hybrids.
• Focused on taxa within the Neotropical Bulbophyllum sect. Didactyle clade.

Main Results:

• Genomic evidence confirmed hybridization in all three studied systems.
• No signs of backcrossing were detected despite the occurrence of hybridization.
• The study identified hybridization as a significant factor in the evolutionary history of Bulbophyllum sect. Didactyle.

Conclusions:

• Genomic data supports the hybrid status of the studied Neotropical Bulbophyllum species.
• Hybridization appears to be a frequent event in the evolutionary history of Bulbophyllum sect. Didactyle.
• Further research is warranted to understand the evolutionary role of hybridization in this orchid clade.