Cytogenetic and Genome Research · 2005 · 21 citations · 25 references
Life SciencesGeneticsPlant SciencesCytogeneticsGametogenesisPlant GeneticsChromosome Pairing BehaviorHexaploid BreedingHomologous Chromosome PairingMeiosis Chromosome BehaviorMeiotic Behavior In PolyploidsMeiotic Prophase ICytological DiploidizationHybrid CultivarsMeiotic Behavior In TetraploidsMeiotic Chromosome Pairing AnalysisMeiotic ConfigurationsMeiotic DiploidizationMeiotic Pairing BehaviorWheat Breeding
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.
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Genetic Control of the Cytologically Diploid Behaviour of Hexaploid Wheat
Ralph Riley, Victor Chapman · Nature · 1958 · 952 citations