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Phylogenetic relationships in Leymus (Triticeae; Poaceae): Evidence from chloroplast trnH‐psbA and mitochondrial coxII intron sequences

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Leymus Hochst. is a polyploid genus with a diverse array of morphology, cytology, ecology, and
distribution in Triticeae. To investigate the phylogenetic relationships and maternal genome donor of polyploid
Leymus, the chloroplast trnH‐psbA region and mitochondrial coxII intron sequences of 33 Leymus taxa were analyzed
with those of 36 diploid perennial species representing 19 basic genomes in Triticeae. The results showed that
reticulate evolution occurred in Leymus species, with the cytoplasmic lineage of Leymus contributed by different
progenitors. Interspecific relationships of Leymus were also elucidated on the basis of orthologous comparison. Our
data suggested that: (i) due to incomplete lineage sorting and/or difference in the pattern of chloroplast and
mitochondrial inheritance, the genealogical conflict between the two genealogical patterns suggest the contribution of Psathyrostachys Nevski, Agropyron J. Gaertn, Eremopyrum (Ledeb.) Jaub. & Spach, Pseudoroegneria (Nevski) Á.
Löve, Thinopyrum Á. Löve, and Lophopyrum (Host) Á. Löve to the cytoplasmic lineage of Leymus; (ii) there is a close
relationship among Leymus species from the same area or neighboring geographic regions; (iii) L. coreanus (Honda)
K. B. Jensen & R. R.‐C. Wang, L. duthiei (Stapf) Y. H. Zhou & H. Q. Zhang ex C. Yen, J. L. Yang & B. R. Baum,
L. duthiei var. longearistatus (Hack.) Y. H. Zhou & H. Q. Zhang ex C. Yen, J. L. Yang & B. R. Baum, and
L. komarovii (Roshev.) C. Yen, J. L. Yang & B. R. Baum are closely related to other Leymus species, and it is
reasonable to transfer these species from the genus Hystrix Moench to Leymus; (iv) Leymus species from North
America are closely related to L. coreanus from the Russian Far East and L. komarovii from northeast China but are
evolutionarily distinct from Leymus species from Central Asia and the Qinghai–Tibet Plateau. The occurrence of
multiple origin and introgression could account for the rich diversity and ecological adaptation of Leymus species.

Key words chloroplast trnH‐psbA, Leymus, mitochondrial coxII, polyploidy, speciation.

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Informasi Detail

Judul Seri

Journal of Systematics and Evolution

No. Panggil

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Penerbit

: Institute of Botany., 2014

Deskripsi Fisik

Journal of Systematics and Evolution 52 (6): 722–734 (2014)

Bahasa

English

ISBN/ISSN

doi: 10.1111/jse.120

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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