e-journal

Biosystematics and evolutionary relationships of perennial Triticeae species revealed by genomic analyses

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Understanding the classification and biosystematics of species in Triticeae Dumort., an economically
important tribe in the grass family (Poaceae), is not an easy task, particularly for some perennial species. Does
genomic analysis facilitate the understanding of evolutionary relationships of these Triticeae species? We reviewed
literature published after 1984 to address questions concerning: (1) genome relationships among the monogenomic
diploid species; (2) progenitors of the unknown Y genome in Elymus polyploids, X genome in Thinopyrum
intermedium, and Xm genome in Leymus; and (3) genome constitutions of some perennial Triticeae species that were
unknown or misidentified.Amajority of publications have substantiated the close affinity of the Eb and Ee genomes in
Th. bessarabicum and Th. elongatum, supporting the use of a common basic genome symbol. The E genome is close
to the St genome of Pseudoroegneria and ABD genomes of Triticum/Aegilops complex, providing an explanation for
transferring genes from the E to ABD genomes with relative ease. Although the solid proof is still lacking, theW, P,
and especially Xp genomes are possible origins for the Y genome of polyploid Elymus. The absence of the E genome
and the allopolyploidy nature of tetraploid Leymus species have been unequivocally confirmed by both cytogenetic
and molecular studies. However, the donor of the Xm genomes of Leymus was only speculated to be related to the P
genome of Agropyron and F genome of Eremopyrum. Intermediate wheatgrass (Th. intermedium) has been
extensively studied. The presence of the St (as the previously designated X) genome in Th. intermedium is now
unequivocal. Its two more closely related E1 and E2 genomes are shown to be older versions of the E genome rather
than the current Eb and Ee genomes. Speciation of Th. intermedium was similar to that of Triticum aestivum, in which
the Js/Es (like B) genomes had the greatest differentiation from the current J (Eb) genome owning to repetitive
sequences of the V genome, whereas its St (like D) had the least differentiation from the current St genome. Species
with unknown or misidentified genomes have been correctly designated, including those with the ESt, StP, StPY,
StWY, EStP, HW, StYHW, and NsXm genomes. Some of those species have been transferred to and renamed in
appropriate genera.

Key words diploid, forage, genome, genus, grass, polyploid, progenitor, speciation, Triticeae, wheat.

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Systematics and Evolution

No. Panggil

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Penerbit

: U.S. Government work., 2014

Deskripsi Fisik

Journal of Systematics and Evolution 52 (6): 697–705 (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

Lampiran Berkas

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