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Monotelodisomics in pearl millet
J V Pantulu1, V Manga, M V Subba Rao
1Department of Botany, Andhra University, Waltair, A.P., India.
Summary
Researchers identified monotelodisomic plants in Pennisetum typhoides crosses. These plants, with a unique chromosome structure (2n=13+1 telocentric), exhibit heterozygosity for chromosomal interchanges.
Area of Science:
- Cytogenetics
- Plant breeding
- Genetics
Background:
- Pennisetum typhoides (pearl millet) is a vital cereal crop.
- Understanding chromosomal aberrations is crucial for breeding programs.
- Telocentric chromosomes and interchanges can impact plant fertility and genetics.
Purpose of the Study:
- To investigate the chromosomal constitution of progeny from crosses involving telocentric chromosomes in Pennisetum typhoides.
- To identify and characterize plants with specific aneuploidies, such as monotelodisomics.
Main Methods:
- Cross-pollination between Pennisetum typhoides with 2n=13+2 telocentrics (male parents) and normal diploids.
- Cytological analysis of progeny at diakinesis and metaphase I to observe chromosome associations.
- Identification of plants with 2n=13+1 telocentric chromosome constitution.
Main Results:
- Two Pennisetum typhoides plants with a 2n=13+1 telocentric chromosome number were identified.
- These plants were heterozygous for a chromosomal interchange, indicated by quadrivalent associations (6″+tI″) at meiosis.
- The identified plants were classified as monotelodisomics, being monosomic for one chromosome arm.
Conclusions:
- Monotelodisomic plants can arise from crosses involving telocentric chromosomes in Pennisetum typhoides.
- These findings contribute to the understanding of chromosomal instability and segregation in pearl millet.
- Characterization of such chromosomal variants is essential for genetic mapping and breeding strategies.
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