title: Synaptic behaviour of hexaploid wheat haploids with different effectiveness of the diploidizing mechanism.
abstract: Haploids of three cultivars of Triticum aestivum (Thatcher, Chris, and Chinese Spring) were obtained from crosses with Zea mays. The level of chromosome pairing at metaphase I and the synaptic behaviour at prophase I was studied. There were differences in the meiotic behaviour of the haploids from different cultivars. Thatcher and Chris haploids had significantly higher levels of pairing at metaphase I than Chinese Spring haploids. This metaphase I pairing was correlated with higher levels of synapsis achieved in the Thatcher and Chris prophase I nuclei than in the Chinese Spring nuclei. Variation in the effectiveness of the diploidizing mechanism among cultivars of wheat is proposed to have a genetic origin and the role of the Ph1 locus in the different haploids is discussed.
authors.affiliation: Departamento de Genética, Facultad de Ciencias Biológicas, Universidad Complutense, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Martinez
authors.forename: C
authors.initials: C
authors.lastname: Cuadrado
authors.forename: D A
authors.initials: DA
authors.lastname: Laurie
authors.forename: C
authors.initials: C
authors.lastname: Romero
mesh_terms: D023902:Chromosome Pairing; D006238:Haploidy; D008677:Metaphase; D011123:Polyploidy; D014908:Triticum / Q000166:cytology / Q000235:genetics*