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Genetic and cytogenetic analyses of the A genome of Triticum monococcum: VII. Telotrisomics and a ditelotetrasomic



Genetic and cytogenetic analyses of the A genome of Triticum monococcum: VII. Telotrisomics and a ditelotetrasomic



Genome 35(5): 849-854



Telotrisomics (2n = 14 + t) were obtained from primary trisomics for chromosome 5A in Triticum monococcum. Subsequently, a ditelotetrasomic (2n = 14 + 2t) plant was obtained from these telotrisomics. C-banding analysis revealed that the extra telocentric chromosome in these aneuploids consisted of the short arm of chromosome 5A (triplo 5AS). Of 78 meiocytes studied at diakinesis and metaphase I in the telotrisomics, 20 (27.0%), 46 (58.9%), and 12 (14.1%) showed 6 II + 1 III, 6 II + 3 I, and 7 II + 1 I configurations, respectively. Although the majority of the cells (84%) at anaphase I (AI) in the telotrisomics showed a 7-8 chromosome segregation, chromosome laggards were also observed. Their frequency (16%) was much higher than in primary trisomics. In a ditelotetrasomic plant, 14, 6, 8, and 4 cells of the 42 meiocytes studied showed 6 II + 1 IV, 7 II + 2 I, 6 II + 1 III + 1 I, and 8 II configurations, respectively. Approximately 62% of the meiocytes at AI in this plant showed an 8-8 chromosome segregation. Compared with primary trisomics and diploids, telotrisomics showed an intermediate phenotype for many of the characters studied. The telotrisomics headed earlier than primary trisomics, but later than diploids. The ditelotetrasomic headed much later than the telotrisomics. The ditelotetrasomic plant also showed very deleterious phenotypes such as slow growth and degeneration of tillers during the later stage of growth. An average of g 51.7% of the florets of the telotrisomics exhibited seed set under greenhouse growing conditions. Fertility of the ditelotetrasomic plant on the other hand was very low (2.5%) under the same growing conditions.

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Accession: 008725303

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DOI: 10.1139/g92-129


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