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Independent allopolyploidization events preceded speciation in the temperate and tropical woody bamboos
Author(s) -
Triplett Jimmy K.,
Clark Lynn G.,
Fisher Amanda E.,
Wen Jun
Publication year - 2014
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.12988
Subject(s) - biology , reticulate evolution , phylogenomics , phylogenetic tree , tribe , bamboo , lineage (genetic) , evolutionary biology , phylogenetics , clade , ecology , botany , genetics , gene , sociology , anthropology
Summary The objectives of the current study were to investigate the origin of polyploidy in the woody bamboos and examine putative hybrid relationships in one major lineage (the temperate woody bamboos, tribe A rundinarieae). Phylogenetic analyses were based on sequence data from three nuclear loci and 38 species in 27 genera. We identify six ancestral genome donors for contemporary bamboo lineages: temperate woody bamboos (tribe A rundinarieae) contain genomes A and B, tropical woody bamboos (tribe B ambuseae) contain genomes C and D , and herbaceous bamboos (tribe O lyreae) contain genome H ; some hexaploid paleotropical bamboos contain genome E in addition to C and D . Molecular data indicate that allopolyploidy arose independently in temperate ( AABB ) and tropical woody lineages ( CCDD and CCDDEE ), and speciation occurred subsequent to polyploidization. Moreover, hybridization has played a surprising and recurrent role in bamboo evolution, generating allohexaploid species in the paleotropical clade and intergeneric hybrids among the allotetraploid temperate bamboos. We suggest this complex history of reticulate evolution is at least partially responsible for the taxonomic difficulty associated with the woody bamboos. This newly‐resolved phylogenetic framework reflects a major step forward in our understanding of bamboo biodiversity and has important implications for the interpretation of bamboo phylogenomics.