Analysis of Chromosome Associations during Early Meiosis in Wheat Lines Carrying Chromosome Introgressions from <i>Agropyron cristatum</i>
Crested wheatgrass (<i>Agropyron cristatum</i> L. Gaertn., genome P), included in the Triticeae tribe (family Poaceae), is one of the most important grasses in temperate regions. It has been valued as a donor of important agronomic traits for wheat improvement, including tolerance to col...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/6f7da226c687452da9c27d030baee103 |
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| Sumario: | Crested wheatgrass (<i>Agropyron cristatum</i> L. Gaertn., genome P), included in the Triticeae tribe (family Poaceae), is one of the most important grasses in temperate regions. It has been valued as a donor of important agronomic traits for wheat improvement, including tolerance to cold, drought, and high salinity, as well as resistance to leaf rust, stripe rust, and powdery mildew. For successful incorporation of beneficial alleles into wheat, it is essential that recombination between wheat and <i>A. cristatum</i> chromosomes occurs. In this work, we analysed chromosome associations during meiosis in wheat lines carrying chromosome introgressions from <i>A. cristatum</i> chromosomes 5P and 6P in the presence and absence of <i>Ph1</i> locus using fluorescence <i>in situ</i> hybridisation. The results showed that the <i>Ph1</i> locus does not affect chromosome associations between <i>A. cristatum</i> and wheat chromosomes because there were no interspecific chromosome associations; therefore, no recombination between chromosomes from wheat and <i>Agropyron</i> were observed in the absence of the <i>Ph1</i> locus. The 5P and 6P <i>A. cristatum</i> chromosomes do not have a suppressor effect on the <i>Ph1</i> locus. Wheat univalents in metaphase I suggest that <i>Agropyron</i> chromosomes might carry genes having a role in wheat homologous chromosome associations. Putative effect of the <i>Agropyron</i> genes on wheat chromosome associations does not interact with the <i>Ph1</i> locus. |
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