G<scp>enome origins of</scp><i>T<scp>riticum cylindricum</scp>, T<scp>riticum triunciale</scp>,</i><scp>and</scp><i>T<scp>riticum ventricosum</scp></i> (P<scp>oaceae) inferred from variation in restriction patterns of repeated nucleotide sequences: a methodological study</scp>

Dubcovsky, Jorge; Dvořák, Jan

doi:10.1002/j.1537-2197.1994.tb11454.x

Cited by 21 publications

References 44 publications

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Genome identification of the Triticum crassum complex (Poaceae) with the restriction patterns of repeated nucleotide sequences

Dubcovsky

Dvořák

1995

American J of Botany

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Species of the Triticum crassum complex, tetraploid and hexaploid T. crassum, hexaploid T. juvenale, and hexaploid T. syriacum, share a similar morphology. Variation in the restriction profiles of nuclear repeated nucleotide sequences is employed in identification ofgenomes ofthese species. The data show that hexaploid T. crassum originated from hybridization of the tetraploid cytotype of T. crassum with T. tauschii. Triticum juvenale and T. syriacum originated from hybridization of tetraploid T. crassum with T. umbellulatum and T. searsii, respectively. Tetraploid T. crassum appears to be an ancient allotetraploid that originated from hybridization of primitive T. tauschii with an ancient species in the evolutionary lineage leading to the section Sitopsis of the genus Triticum.The Triticum crassum complex includes the tetraploid (2n = 4x = 28) and hexaploid (2n = 6x = 42) cytotypes of T. crassum (Boiss.) Aitch. & Hemsl., T. juvenale Thell. (2n = 6x = 42), and T. syriacum Bowden (2n = 6x = 42). All species showed the same restriction patterns of chloroplast (cp) DNAs (Ogihara and Tsunewaki, 1988), which suggests that tetraploid T. crassum was the likely female parent of the hexaploid species. Each hexaploid species had, however, a different male parent. Triticum tauschii (Coss.) Schmalh. is the most likely male parent of hexaploid T. crassum (Kihara, 1949(Kihara, , 1957(Kihara, , 1963Kihara, Yamashita, and Tanaka, 1959;Shigenobu and Sakamoto, 1977; Jaaska, 198 1;Nakai, 1982; KimberandZhao, 1983;Zhao and Kimber, 1984;Zhang and Dvorak, 1992); T. umbellulatum (Zhuk.) Bowden is the most likely male parent of T. juvenale (Kihara, 1957(Kihara, , 1963Chennaveeraiah, 1960; McGinnis and Melnyk, 1962; Kimber and Yen, 1989); and T. searsii is the most likely male parent of T. syriacum .The origin of tetraploid T. crassum is uncertain. The chloroplast genome of T. crassum differs from the chloroplast genomes of all other Triticum species by at least six mutations (Ogihara and Tsunewaki, 1988). Cluster analysis of nucleotide sequences of the chloroplast gene encoding the large subunit of ribulose 1,5-bisphosphate carboxylase (rbcL) in T. crassum, T. tauschii, T. caudatum, T. urartu, and T. aestivum indicates that the chloroplast genome of T. crassum is more similar to that of T. tauschii than to the chloroplast genomes of the other species (Terachi, Ogihara, and Tsunewaki, 1988; Tsunewaki, 1989). Triticum tauschii was also suggested to be a donor of one of the nuclear genomes of tetraploid T. crassum (Kihara, 1949;Chennaveeraiah, 1960; Jaaska, 1981), but chromosome pairing in interspecific hybrids revealed substantial differentiation of these genomes (Lilienfeld, 1951;Kimber and Zhao, 1983). The origin of the second genome of tetraploid T. crassum is even more obscure. Kihara (1949) (Kihara, 1954(Kihara, , 1963Kihara, Yamashita, and Tanaka, 1959). Although numerous studies have failed to verify the presence of the M genome in tetraploid T. crassum (Chennaveeraiah, 1960; Jaaska, 1981;Masci et al., 1992;Zhang and Dvorak, 19...

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Genome identification of the Triticum crassum complex (Poaceae) with the restriction patterns of repeated nucleotide sequences

Dubcovsky

Dvořák

1995

American J of Botany

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The origins of the genomes of Triticum biunciale, t. ovatum, t. neglectum, t. columnare, and t. rectum (poaceae) based on variation in repeated nucleotide sequences

Resta

Zhang

Dubcovsky

et al. 1996

American J of Botany

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The origins of the genomes of allotetraploid species Triticum biunciale, T. ovatum, T. neglectum, and T. columnare, and allohexaploid T. rectum were investigated by examining the presence of specific restriction fragments of repeated nucleotide sequences in DNAs of the polyploid species. The restriction fragments were detectable either in a single diploid Triticum species (unique characters) or a group of diploid species (unique shared characters). The analysis showed that Triticum biunciale and T. ovatum are closely related. In both species, one pair of genomes is closely related to the genome of T. umbellulatum and the other is a modified genome of T. comosum. The same genome formula, UUM°M°, is proposed for T. biunciale and T. ovatum. Potential reasons for the modification of the M° genome are discussed. Triticum neglectum and T. columnare are also closely related to each other and have the same genomes. They share the U genome with T. biunciale and T. ovatum, but their second pair of genomes is unrelated to the M° genome. No relationship was found of this genome to a genome of any extant diploid species of Triticum or any phylogenetic lineage leading to the extant diploid species. This unknown genome is designated X'.∗∗∗ The proposed genome formula for T. neglectum and T. columnare is UUX'X'∗∗∗. Hexaploid T. rectum originated from hybridization of one of the tetraploid species with the formula UUX'X', likely T. neglectum, with T. uniaristatum (genome N), and its genome formula is UUX'X'NN.

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The Close Relationship Between the A and B Genomes inAvenaL. (Poaceae) Determined by Molecular Cytogenetic Analysis of Total Genomic, Tandemly and Dispersed Repetitive DNA Sequences

1997

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Genome origins ofTriticum cylindricum, Triticum triunciale,andTriticum ventricosum (Poaceae) inferred from variation in restriction patterns of repeated nucleotide sequences: a methodological study

Cited by 21 publications

References 44 publications

Genome identification of the Triticum crassum complex (Poaceae) with the restriction patterns of repeated nucleotide sequences

Genome identification of the Triticum crassum complex (Poaceae) with the restriction patterns of repeated nucleotide sequences

The origins of the genomes of Triticum biunciale, t. ovatum, t. neglectum, t. columnare, and t. rectum (poaceae) based on variation in repeated nucleotide sequences

The Close Relationship Between the A and B Genomes inAvenaL. (Poaceae) Determined by Molecular Cytogenetic Analysis of Total Genomic, Tandemly and Dispersed Repetitive DNA Sequences

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