Echoes of ancient introgression punctuate stable genomic lineages in the evolution of figs
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Echoes of ancient introgression punctuate stable genomic lineages in the evolution of figs. / Gardner, Elliot M.; Bruun-Lund, Sam; Niissalo, Matti; Chantarasuwan, Bhanumas; Clement, Wendy L.; Geri, Connie; Harrison, Rhett D.; Hipp, Andrew L.; Holvoet, Maxime; Khew, Gillian; Kjellberg, Finn; Liao, Shuai; Pederneiras, Leandro Cardoso; Peng, Yan-Qiong; Pereira, Joan T.; Phillipps, Quentin; Puad, Aida Shafreena Ahmad; Rasplus, Jean-Yves; Sang, Julia; Schou, Sverre Juul; Velautham, Elango; Weiblen, George D.; Zerega, Nyree J. C.; Zhang, Qian; Zhang, Zhen; Baraloto, Christopher; Rønsted, Nina.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 120, No. 28, e2222035120, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Echoes of ancient introgression punctuate stable genomic lineages in the evolution of figs
AU - Gardner, Elliot M.
AU - Bruun-Lund, Sam
AU - Niissalo, Matti
AU - Chantarasuwan, Bhanumas
AU - Clement, Wendy L.
AU - Geri, Connie
AU - Harrison, Rhett D.
AU - Hipp, Andrew L.
AU - Holvoet, Maxime
AU - Khew, Gillian
AU - Kjellberg, Finn
AU - Liao, Shuai
AU - Pederneiras, Leandro Cardoso
AU - Peng, Yan-Qiong
AU - Pereira, Joan T.
AU - Phillipps, Quentin
AU - Puad, Aida Shafreena Ahmad
AU - Rasplus, Jean-Yves
AU - Sang, Julia
AU - Schou, Sverre Juul
AU - Velautham, Elango
AU - Weiblen, George D.
AU - Zerega, Nyree J. C.
AU - Zhang, Qian
AU - Zhang, Zhen
AU - Baraloto, Christopher
AU - Rønsted, Nina
N1 - Publisher Copyright: Copyright © 2023 the Author(s).
PY - 2023
Y1 - 2023
N2 - Studies investigating the evolution of flowering plants have long focused on isolating mechanisms such as pollinator specificity. Some recent studies have proposed a role for introgressive hybridization between species, recognizing that isolating processes such as pollinator specialization may not be complete barriers to hybridization. Occasional hybridization may therefore lead to distinct yet reproductively connected lineages. We investigate the balance between introgression and reproductive isolation in a diverse clade using a densely sampled phylogenomic study of fig trees (Ficus, Moraceae). Codiversification with specialized pollinating wasps (Agaonidae) is recognized as a major engine of fig diversity, leading to about 850 species. Nevertheless, some studies have focused on the importance of hybridization in Ficus, highlighting the consequences of pollinator sharing. Here, we employ dense taxon sampling (520 species) throughout Moraceae and 1,751 loci to investigate phylogenetic relationships and the prevalence of introgression among species throughout the history of Ficus. We present a well-resolved phylogenomic backbone for Ficus, providing a solid foundation for an updated classification. Our results paint a picture of phylogenetically stable evolution within lineages punctuated by occasional local introgression events likely mediated by local pollinator sharing, illustrated by clear cases of cytoplasmic introgression that have been nearly drowned out of the nuclear genome through subsequent lineage fidelity. The phylogenetic history of figs thus highlights that while hybridization is an important process in plant evolution, the mere ability of species to hybridize locally does not necessarily translate into ongoing introgression between distant lineages, particularly in the presence of obligate plant–pollinator relationships.
AB - Studies investigating the evolution of flowering plants have long focused on isolating mechanisms such as pollinator specificity. Some recent studies have proposed a role for introgressive hybridization between species, recognizing that isolating processes such as pollinator specialization may not be complete barriers to hybridization. Occasional hybridization may therefore lead to distinct yet reproductively connected lineages. We investigate the balance between introgression and reproductive isolation in a diverse clade using a densely sampled phylogenomic study of fig trees (Ficus, Moraceae). Codiversification with specialized pollinating wasps (Agaonidae) is recognized as a major engine of fig diversity, leading to about 850 species. Nevertheless, some studies have focused on the importance of hybridization in Ficus, highlighting the consequences of pollinator sharing. Here, we employ dense taxon sampling (520 species) throughout Moraceae and 1,751 loci to investigate phylogenetic relationships and the prevalence of introgression among species throughout the history of Ficus. We present a well-resolved phylogenomic backbone for Ficus, providing a solid foundation for an updated classification. Our results paint a picture of phylogenetically stable evolution within lineages punctuated by occasional local introgression events likely mediated by local pollinator sharing, illustrated by clear cases of cytoplasmic introgression that have been nearly drowned out of the nuclear genome through subsequent lineage fidelity. The phylogenetic history of figs thus highlights that while hybridization is an important process in plant evolution, the mere ability of species to hybridize locally does not necessarily translate into ongoing introgression between distant lineages, particularly in the presence of obligate plant–pollinator relationships.
KW - Ficus
KW - hybridization
KW - Moraceae
KW - phylogenomics
U2 - 10.1073/pnas.2222035120
DO - 10.1073/pnas.2222035120
M3 - Journal article
C2 - 37399402
AN - SCOPUS:85161602541
VL - 120
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 28
M1 - e2222035120
ER -
ID: 362898089