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Molecular evolution of the internal transcribed spacers (ITS1 and ITS2) and phylogenetic relationships among species of the family Cucurbitaceae.

Abstract：

:Phylogenetic relationships of different members of the family Cucurbitaceae were estimated from sequences of the internal transcribed spacer (ITS1 and ITS2) regions of the nuclear ribosomal RNA genes. Twenty-six species of different genera belonging to different tribes and several subtribes were analyzed. The whole ITS regions were amplified by PCR technique and cloned, and three to five different clones of each species were sequenced; for some species PCR products were sequenced directly. ITS1 and ITS2 regions are slightly variable in length, with each length appearing genus-specific. A substitution rate of 3.62 x 10(-9) substitutions per site per year was calculated assuming 40 MYA separation time. Phylogenetic relationships inferred from ITS sequences of some species is in agreement with morphological data, but deviations to the taxonomic classification were also observed. A polyphyletic origin of the New World species must be considered. In the genus Cucurbita different "types" of ITS sequences within one species exist, possibly due to the high frequency of introgression during domestication or due to polyploidization events; in contrast, low intraspecific variability was detectable in the genus Cucumis, indicating different stages of speciation.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Jobst J,King K,Hemleben V

doi

10.1006/mpev.1997.0465

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

204-19

issue

2

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(97)90465-6

journal_volume

9

pub_type

杂志文章

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