On the diploidization mechanism of the genus Aegilops:: meiotic behaviour of interspecific hybrids

被引：12

作者：

Cuñado, N ^{[1
]}

Santos, JL ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Biol, Dept Genet, E-28040 Madrid, Spain

来源：

THEORETICAL AND APPLIED GENETICS | 1999年 / 99卷 / 06期

关键词：

Aegilops; diploidization; interspecific hybrid; meiosis; synaptonemal complex;

D O I：

10.1007/s001220051418

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Chromosomal pairing of the three diploid hybrids Aegilops uniaristata x Ae. tauschii (ND), Ae. umbellulata x Ae. tauschii (UD) and Ae. comosa x Ae. uniaristata (MN), and a triploid hybrid Ae. cylindrica x Ae. caudata (DCC), was analyzed by electron microscopy in surface-spread-prophase-I nuclei and compared with light-microscopic observations of metaphase-I cells after C-banding and fluorescence in situ hybridization. All hybrids showed extensive synapsis and complex multivalents in which up to 14 chromosomes were involved. In the diploid hybrids most metaphase-I chromosomal associations were between homoeologs, their frequencies being dependent on the relationship between the donor genomes. Despite the different overall bound arm frequencies displayed by ND and MN hybrids at metaphase-I, chromosomes bearing rDNA sequences showed similar mean cell chromosomal association frequencies. In the triploid hybrid preferential associations involving C genomes were predominant. These observations are discussed in relation to the mechanism of diploidization showed by allotetraploid Aegilops species.

引用

页码：1080 / 1086

页数：7

共 33 条

[1]

ABUBAKAR M, 1982, Z PFLANZENZUCHT, V89, P130

[2] SYNAPTONEMAL COMPLEX SPREADING IN ALLIUM-CEPA AND ALLIUM-FISTULOSUM .3. THE F1-HYBRID [J].

ALBINI, SM ;

JONES, GH .

GENOME, 1990, 33 (06) :854-866

[3] Genome differentiation in Aegilops .2. Physical mapping of 5S and 18S-26S ribosomal RNA gene families in diploid species [J].

Badaeva, ED ;

Friebe, B ;

Gill, BS .

GENOME, 1996, 39 (06) :1150-1158

[4] Genome differentiation in Aegilops .1. Distribution of highly repetitive DNA sequences on chromosomes of diploid species [J].

Badaeva, ED ;

Friebe, B ;

Gill, BS .

GENOME, 1996, 39 (02) :293-306

[5]

CHENNAVEERAIAH M. S., 1960, ACTA HORTI GOTOBURGENSIS, V23, P85

[6] Chromosome pairing in the allotetraploid Aegilops biuncialis and a triploid intergeneric hybrid [J].

Cunado, N ;

Callejas, S ;

Garcia, MJ ;

Fernandez, A ;

Santos, JL .

GENOME, 1996, 39 (04) :664-670

[7]

Cunado N, 1996, THEOR APPL GENET, V93, P1152, DOI 10.1007/BF00230139

[8] GENOMIC ANALYSIS IN THE GENUS AEGILOPS .3. INTERGENERIC HYBRIDS BETWEEN DIFFERENT SPECIES OF AEGILOPS AND SECALE-CEREALE [J].

CUNADO, N .

THEORETICAL AND APPLIED GENETICS, 1992, 85 (2-3) :309-316

[9] INTERACTIONS BETWEEN WHEAT, RYE AND AEGILOPS-VENTRICOSA CHROMOSOMES ON HOMOLOGOUS AND HOMOEOLOGOUS PAIRING [J].

CUNADO, N ;

CERMENO, MC ;

ORELLANA, J .

HEREDITY, 1986, 56 :219-226

[10] ANALYSIS OF METAPHASE-I CHROMOSOME ASSOCIATION IN SPECIES OF THE GENUS AEGILOPS [J].

CUNADO, N .

THEORETICAL AND APPLIED GENETICS, 1992, 85 (2-3) :283-292

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