Plastid phylogenomics and morphological character evolution of Chloridoideae (Poaceae)
Chloridoideae is one of the largest subfamilies of Poaceae, containing many species of great economic and ecological value; however, phylogenetic relationships among the subtribes and genera of Cynodonteae are controversial. In the present study, we combined 111 plastomes representing all five tribe...
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Published in | Frontiers in plant science Vol. 13; p. 1002724 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Frontiers Media S.A
02.11.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Chloridoideae is one of the largest subfamilies of Poaceae, containing many species of great economic and ecological value; however, phylogenetic relationships among the subtribes and genera of Cynodonteae are controversial. In the present study, we combined 111 plastomes representing all five tribes, including 25 newly sequenced plastomes that are mostly from Cynodonteae. Phylogenetic analyses supported the five monophyletic tribes of Chloridoideae, including Centropodieae, Triraphideae, Eragrostideae, Zoysieae and Cynodonteae. Simultaneously, nine monophyletic lineages were revealed in Cynodonteae: supersubtribe Boutelouodinae, subtribes Tripogoninae, Aeluropodinae, Eleusininae, Dactylocteniinae, supersubtribe Gouiniodinae,
Cleistogenes
and
Orinus
, and subtribe Triodiinae. Within the tribe of Cynodonteae, the basal lineage is supersubtribe Boutelouodinae and Tripogoninae is sister to the remaining lineages. The clade formed of Aeluropodinae and Eleusininae is sister to the clade composed of Dactylocteniinae, supersubtribe Gouiniodinae,
Cleistogenes
and
Orinus
, and subtribe Triodiinae. The clade comprising Dactylocteniinae and supersubtribe Gouiniodinae is sister to the clade comprising
Cleistogenes
,
Orinus
, and Triodiinae.
Acrachne
is a genus within Eleusininae but not within Dactylocteniinae. Molecular evidence determined that
Diplachne
is not clustered with
Leptochloa
, which indicated that
Diplachne
should not be combined into
Leptochloa
.
Cleistogenes
is sister to a clade composed of
Orinus
and
Triodia
, whereas the recently proposed subtribe Orininae was not supported. Cynodonteae was estimated to have experienced rapid divergence within a short period, which could be a major obstacle in resolving its phylogenetic relationships. Ancestral state reconstructions of morphological characters showed that the most recent common ancestor (MRCA) of Chloridoideae has a panicle, multiple florets in each spikelet, the peaked type of stomatal subsidiary cells, and a saddle-shaped phytoliths, while the ancestral morphological characters of Cynodonteae are the panicle, peaked type of stomatal subsidiary cells, sharp-cap cell typed and equal-base-cell microhair, and square-shaped phytoliths. Overall, plastome phylogenomics provides new insights into the phylogenetic relationships and morphological character evolution of Chloridoideae. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Reviewed by: Kean-Jin Lim, Zhejiang Agriculture and Forestry University, China; Abdullah, Quaid-i-Azam University, Pakistan This article was submitted to Plant Systematics and Evolution, a section of the journal Frontiers in Plant Science Edited by: Renata Reinheimer, CONICET Coastline Agrobiotechnology Institute (IAL), Argentina |
ISSN: | 1664-462X 1664-462X |
DOI: | 10.3389/fpls.2022.1002724 |