Abstract
Understanding the phylogenetic relationship between Triticum and Aegilops species, which form a vast gene pool of wheat, is very important for breeding new cultivated wheat varieties. In the present study, phylogenetic relationships between Triticum (12 samples from 4 species) and Aegilops (24 samples from 8 species) were investigated using sequences of the nuclear ITS rDNA gene and partial sequences of the matK gene of chloroplast genome. The phylogenetic relationships among species were reconstructed using Maximum Likelihood method. The constructed tree based on the sequences of the nuclear component (ITS) displayed a close relationship between polyploid wheats and Aegilops speltoides species which provided new evidence for the source of the enigmatic B genome donor as Ae. speltoides. Concurrent clustering of Ae. cylindrica and Ae. tauschii and their close positioning to polyploid wheats pointed the source of the D genome as one of these species. As reported before, diploid Triticum species (i.e. T. urartu) were identified as the A genome donors and the positioning of these diploid wheats on the constructed tree are meaningful. The constructed tree based on the chloroplastic matK sequences displayed same relationship between polyploid wheats and Ae. speltoides species providing evidence for the later species being the chloroplast donors for polyploid wheats. Therefore, our results supported the idea of coinheritance of nuclear and chloroplast genomes where Ae. speltoides was the maternal donor. For both trees the remaining Aegilops species produced a distinct cluster whereas with the exception of T. urartu, diploid Triticum species displayed a monophyletic structure.
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Claims 7
Claim · model-written summary
ITS tree places polyploid wheats close to Aegilops speltoides, supporting it as B genome donor.
Verbatim
e0“The constructed tree based on the sequences of the nuclear component (ITS) displayed a close relationship between polyploid wheats and Aegilops speltoides species which provided new evidence for the source of the enigmatic B genome donor as Ae. speltoides”
Claim · model-written summary
Ae. cylindrica and Ae. tauschii clustered together near polyploid wheats, pointing to one as D genome source.
Verbatim
e0“Concurrent clustering of Ae. cylindrica and Ae. tauschii and their close positioning to polyploid wheats pointed the source of the D genome as one of these species”
Claim · model-written summary
Diploid Triticum species including T. urartu were identified as A genome donors.
Verbatim
e0“diploid Triticum species (i.e. T. urartu) were identified as the A genome donors”
Claim · model-written summary
The matK tree linked polyploid wheats with Ae. speltoides, supporting the latter as chloroplast donor.
Verbatim
e0“The constructed tree based on the chloroplastic matK sequences displayed same relationship between polyploid wheats and Ae. speltoides species providing evidence for the later species being the chloroplast donors for polyploid wheats”
Claim · model-written summary
Results supported Ae. speltoides as maternal donor through coinheritance of nuclear and chloroplast genomes.
Verbatim
e0“our results supported the idea of coinheritance of nuclear and chloroplast genomes where Ae. speltoides was the maternal donor”
Claim · model-written summary
Remaining Aegilops species formed a distinct cluster in both trees.
- Outcome
- distinct clustere0
AegilopsOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both trees the remaining Aegilops species produced a distinct cluster”
Claim · model-written summary
Diploid Triticum species except T. urartu formed a monophyletic structure.
Verbatim
e0“with the exception of T. urartu, diploid Triticum species displayed a monophyletic structure”