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Genetic relationships among wheat genotypes, as revealed by microsatellite markers and pedigree analysis

100%

Sud S., Bains N. S., Nanda G. S.

Journal of Applied Genetics

2005

vol. 46

issue 4

375-379

Genetic relationships among 20 elite wheat genotypes were studied using microsatellite markers and pedigree analysis. A total of 93 polymorphic bands were obtained with 25 microsatellite primer pairs. Coefficient of parentage (COP) values were calculated using parentage information at the expansion level of 5. The pedigree-based similarity (mean 0.115, range 0.00?0.53) was lower than the similarity assessed using microsatellite markers (mean 0.70, range 0.47?0.91). Similarity estimates were used to construct dendrograms by using the unweighted pair-group method with arithmetic averages (UPGMA). Clustering of genotypes in respect of marker-based similarity revealed two groups. Genotype PBW442 diverged and appeared as distinct from all other genotypes in both marker-based and pedigree-based analysis. The correlation of COP values with genetic similarity values based on microsatellite markers is low (r = 0.285, p < 0.05). The results indicate a need to develop wheat varieties with a diverse genetic background and to incorporate new variability into the existing wheat gene pool.

Cytological characteristics of F2 hybrids between Triticum aestivum L. and T. durum Desf. with reference to wheat breeding

88%

Wang H.-Y., Liu D.-C., Yan Z.-H., Wei Y.-M., Zheng Y.-L.

Journal of Applied Genetics

2005

vol. 46

issue 4

365-369

Cytological and agronomic characteristics of a F2 population from Triticum aestivum L. ? T. durum Desf. hybrids were analyzed plant by plant. Means of morphologic traits in the F2 population were similar to those of the low-value parent. On average, F2 hybrids had 36.54 chromosomes per plant, indicating that each gamete lost 2.73 chromosomes at meiosis of the F1 generation. More than half of plants had 36?39 chromosomes, so male gametes with 19?21 chromosomes seemed to be superior to the others. The distribution frequency of chromosomes in this study differed from that in a previous report, where a different tetraploid wheat was used. This shows that a different breeding strategy may need to be taken when exploiting a different tetraploid wheat. According to our results, some plants with 42 chromosomes, having all the wheat A, B and D chromosomes, would appear in the F3 population, which provides a chance to obtain stable bread wheat lines from the self-pollinated progenies. Alternatively, the desirable individuals of the F2 population were backcrossed to bread wheat, which is very useful and efficient for the improvement of bread wheat by exploiting desirable genes in durum wheat.

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2 Journal of Applied Genetics

2 2005

1 Bains N. S.

1 Liu D.-C.

1 Nanda G. S.

1 Sud S.

1 Wang H.-Y.

1 Wei Y.-M.

1 Yan Z.-H.

1 Zheng Y.-L.

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Genetic relationships among wheat genotypes, as revealed by microsatellite markers and pedigree analysis

Cytological characteristics of F2 hybrids between Triticum aestivum L. and T. durum Desf. with reference to wheat breeding