作 者 :ZHOU Yong-Hong, ZHENG You-Liang, YANG Jun-Liang, YAN Ji, JIA Ji-Zeng
期 刊 :植物分类学报 1999年 5期
Keywords:Elymus, RAFD ahalysis, Phylogenetic relationship, Genome, Morphology,
Abstract:
Ten species of Elymus (Poaceae: Triticeae) were analyzed using random ampli-
lied polymorphic DNA (RAPD) markers. Thirty-four decamer oligonucleotide random
primers from Opron Technologies were used for polymorphic selection. 25 (73.53%) pro-
duced polymorphic products. A total of 136 bands amplified from 16 primers were selected
for RAPD analyses. The data were used to generate Nei‘s similarity coefficients and to con-
struct a dendrogram using UPGMA in NTSYS programs. The result showed that: (1)
Three tetraploid species, E. sibiricus L., E. caninus (L.) L. and E. lanceolatus (Scrib-
ner et Smith) Gould, were clustered in one group, while seven hexaploid species, E. nu-
tans Griseb., E. dahuricusTurcz., E. brachyaristatus A Löve, E. submuticus (Keng)
Keng f., E. tangutorum (Nevski)Hand.-Mazz., E. excelsus Turcz. and E. cylindricus
(Franch) Honda, were clustered in another group. The relationship between the tetraploid
and the hexaploid species was remote; (2) E. caninus was closely related to E. sibiricus.
This result supported that Roegneria canina (L.) Nevski was treated as Elymus caninus;
(3) E . nutans was closely related to E. dahuricus ; (4) E.brachyaristatus and E.sub-
muticus were morphologically similar and sympatric in distribution, but there were certain
differences between them in the nucleotide sequences. Both of them were related to E. nu-
tans and E. duhuricus; (5) E. excelsus was closely related to E. cylindricus, and they
were clustered with E. tangutorum; (6) RAPD results are basically comparable with those
obtained from studies on morphology and cytology. It is a useful supplementary method for
assessing the genetic relationships among Elymus species.
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