作 者 ：ZHANG Wen-Ju, QU Li-Jia, GAO Wei, GU Hong-Ya, CHEN Zhang-Liang, CHEN Jia-Kuan
期 刊 ：植物分类学报 1999年 5期
Keywords:Wheat, Aegilops sect．Sitopsis, ITS sequence, Phylogeny, B-genome,
Abstract:
The ITS regions of 5 species in Aegilops sect. Sitopsis, the possible donors of B-
genome of common wheat, were amplified by PCR, cloned and sequenced. The phylogenetic
relationships among 5 species in Aegilops sect. Sitopsis were constructed based on ITS1 +
ITS2 sequences. The results demonstrated that Ae. speltoides was a distinct species in
Aegilops sect. Sitopsis. The average of the pairwise distances between Ae. speltoides and
the other four species was three times as high as that among the latter four. Ae. speltoides
was the earliest lineage of the section under question. Relationship between Ae. longissima
and Ae. sharonensis was the closest in Aegilops sect. Sitopsis. Sequence of ITS region
could be used as a molecular marker to identify origin of B-genome in polyploid wheats.