Hybridization boosts dispersal of two contrasted ecotypes in a grass species
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Hybridization boosts dispersal of two contrasted ecotypes in a grass species. / Curran, Emma V.; Scott, Matilda S.; Olofsson, Jill K.; Nyirenda, Florence; Sotelo, Graciela; Bianconi, Matheus E.; Manzi, Sophie; Besnard, Guillaume; Pereira, Lara; Christin, Pascal-Antoine.
I: Proceedings of the Royal Society B: Biological Sciences, Bind 289, Nr. 1967, 20212491, 2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Hybridization boosts dispersal of two contrasted ecotypes in a grass species
AU - Curran, Emma V.
AU - Scott, Matilda S.
AU - Olofsson, Jill K.
AU - Nyirenda, Florence
AU - Sotelo, Graciela
AU - Bianconi, Matheus E.
AU - Manzi, Sophie
AU - Besnard, Guillaume
AU - Pereira, Lara
AU - Christin, Pascal-Antoine
N1 - Publisher Copyright: © 2022 The Authors.
PY - 2022
Y1 - 2022
N2 - Genetic exchanges between closely related groups of organisms with different adaptations have well-documented beneficial and detrimental consequences. In plants, pollen-mediated exchanges affect the sorting of alleles across physical landscapes and influence rates of hybridization. How these dynamics affect the emergence and spread of novel phenotypes remains only partially understood. Here, we use phylogenomics and population genomics to retrace the origin and spread of two geographically overlapping ecotypes of the African grass Alloteropsis angusta. In addition to an ecotype inhabiting wetlands, we report the existence of a previously undescribed ecotype inhabiting Miombo woodlands and grasslands. The two ecotypes are consistently associated with different nuclear groups, which represent an advanced stage of divergence with secondary low-level gene flow. However, the seed-transported chloroplast genomes are consistently shared by distinct ecotypes inhabiting the same region. These patterns suggest that the nuclear genome of one ecotype can enter the seeds of the other via occasional pollen movements with sorting of nuclear groups in subsequent generations. The contrasting ecotypes of A. angusta can thus use each other as a gateway to new locations across a large part of Africa, showing that hybridization can facilitate the geographical dispersal of distinct ecotypes of the same grass species.
AB - Genetic exchanges between closely related groups of organisms with different adaptations have well-documented beneficial and detrimental consequences. In plants, pollen-mediated exchanges affect the sorting of alleles across physical landscapes and influence rates of hybridization. How these dynamics affect the emergence and spread of novel phenotypes remains only partially understood. Here, we use phylogenomics and population genomics to retrace the origin and spread of two geographically overlapping ecotypes of the African grass Alloteropsis angusta. In addition to an ecotype inhabiting wetlands, we report the existence of a previously undescribed ecotype inhabiting Miombo woodlands and grasslands. The two ecotypes are consistently associated with different nuclear groups, which represent an advanced stage of divergence with secondary low-level gene flow. However, the seed-transported chloroplast genomes are consistently shared by distinct ecotypes inhabiting the same region. These patterns suggest that the nuclear genome of one ecotype can enter the seeds of the other via occasional pollen movements with sorting of nuclear groups in subsequent generations. The contrasting ecotypes of A. angusta can thus use each other as a gateway to new locations across a large part of Africa, showing that hybridization can facilitate the geographical dispersal of distinct ecotypes of the same grass species.
KW - dispersal
KW - ecology
KW - gene flow
KW - growth strategies
KW - hybridization
KW - Poaceae
U2 - 10.1098/rspb.2021.2491
DO - 10.1098/rspb.2021.2491
M3 - Journal article
C2 - 35078363
AN - SCOPUS:85123905471
VL - 289
JO - Philosophical Transactions of the Royal Society B: Biological Sciences
JF - Philosophical Transactions of the Royal Society B: Biological Sciences
SN - 0962-8436
IS - 1967
M1 - 20212491
ER -
ID: 326840073