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Genome relationships in the genus Dasypyrum (Gramineae).
Hereditas. 2001; 135(2-3):101-10.H

Abstract

To elucidate the genome relationships in the genus Dasypyrum and the ancestry of tetraploid D. breviaristatum, two cytotypes of D. breviaristatum and D. villosum were reciprocally crossed with one another. Chromosome pairing at the first metaphase of meiosis and fertility were examined in the F1 hybrids and the parental plants. The mean pairing configuration and mean arm pairing frequency in D. villosum-D. breviaristatum (2x) hybrids were 11.12I + 1.44II per cell and 0.107, respectively, and they were almost completely sterile. In D. breviaristatum (4x)-D. breviaristatum (2x) hybrid, up to seven trivalents were formed, and the mean pairing configuration was 3.38I + 3.20II + 3.74III + 0.005IV per cell. The mean arm pairing frequency and relative affinity calculated in that F1 hybrid were 0.915 and 0.641, respectively. Seven bivalents and seven univalents were characteristically formed in D. villosum-D. breviaristatum (4x) hybrids. Based on the present results, we clearly concluded that the genome of diploid D. breviaristatum is distantly related to the genome V of D. villosum, and that these two species have different basic genomes. We, therefore, proposed the symbol Vb for the haploid genome of diploid cytotype of D. breviaristatum. Moreover, we concluded that tetraploid D. breviaristatum is an autotetraploid with doubled sets of the genomes homologous with that of diploid D. breviaristatum, and we proposed the genome constitution VbVb for the haploid genome set of tetraploid cytotype of D. breviaristatum. Furthermore, from the chromosome pairing in the F1 hybrids involving Moroccan and Greek accessions, it was suggested that complicated rearrangements of chromosome structure have occurred in tetraploid D. breviaristatum in its natural populations across the entire distribution area.

Authors+Show Affiliations

Department of Bioscience, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka-cho, Yoshida-gun, Fukui 910-1195, Japan. ohta@fpu.ac.jpNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12152321

Citation

Ohta, S, and M Morishita. "Genome Relationships in the Genus Dasypyrum (Gramineae)." Hereditas, vol. 135, no. 2-3, 2001, pp. 101-10.
Ohta S, Morishita M. Genome relationships in the genus Dasypyrum (Gramineae). Hereditas. 2001;135(2-3):101-10.
Ohta, S., & Morishita, M. (2001). Genome relationships in the genus Dasypyrum (Gramineae). Hereditas, 135(2-3), 101-10.
Ohta S, Morishita M. Genome Relationships in the Genus Dasypyrum (Gramineae). Hereditas. 2001;135(2-3):101-10. PubMed PMID: 12152321.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Genome relationships in the genus Dasypyrum (Gramineae). AU - Ohta,S, AU - Morishita,M, PY - 2002/8/3/pubmed PY - 2002/8/22/medline PY - 2002/8/3/entrez SP - 101 EP - 10 JF - Hereditas JO - Hereditas VL - 135 IS - 2-3 N2 - To elucidate the genome relationships in the genus Dasypyrum and the ancestry of tetraploid D. breviaristatum, two cytotypes of D. breviaristatum and D. villosum were reciprocally crossed with one another. Chromosome pairing at the first metaphase of meiosis and fertility were examined in the F1 hybrids and the parental plants. The mean pairing configuration and mean arm pairing frequency in D. villosum-D. breviaristatum (2x) hybrids were 11.12I + 1.44II per cell and 0.107, respectively, and they were almost completely sterile. In D. breviaristatum (4x)-D. breviaristatum (2x) hybrid, up to seven trivalents were formed, and the mean pairing configuration was 3.38I + 3.20II + 3.74III + 0.005IV per cell. The mean arm pairing frequency and relative affinity calculated in that F1 hybrid were 0.915 and 0.641, respectively. Seven bivalents and seven univalents were characteristically formed in D. villosum-D. breviaristatum (4x) hybrids. Based on the present results, we clearly concluded that the genome of diploid D. breviaristatum is distantly related to the genome V of D. villosum, and that these two species have different basic genomes. We, therefore, proposed the symbol Vb for the haploid genome of diploid cytotype of D. breviaristatum. Moreover, we concluded that tetraploid D. breviaristatum is an autotetraploid with doubled sets of the genomes homologous with that of diploid D. breviaristatum, and we proposed the genome constitution VbVb for the haploid genome set of tetraploid cytotype of D. breviaristatum. Furthermore, from the chromosome pairing in the F1 hybrids involving Moroccan and Greek accessions, it was suggested that complicated rearrangements of chromosome structure have occurred in tetraploid D. breviaristatum in its natural populations across the entire distribution area. SN - 0018-0661 UR - https://www.unboundmedicine.com/medline/citation/12152321/Genome_relationships_in_the_genus_Dasypyrum__Gramineae__ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0018-0661&date=2001&volume=135&issue=2-3&spage=101 DB - PRIME DP - Unbound Medicine ER -