Ueber cytologische Studien bei einigen Getreidearten

Kihara, H.

doi:10.15281/jplantres1887.33.388_94

Cited by 27 publications

(5 citation statements)

References 10 publications

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“…Tetraploid wheats are composed of two groups: the Emmer wheat (AABB genome) group and the Timopheevi wheat (AAGG genome) group. Both of these tetraploid wheats are allopolyploids resulting from crosses between wild diploid wheat (AA genome) and a species belonging to the Sitopsis section of the genus Aegilops (Kihara 1924;Lilienfeld 1951;Sarkar and Stebbins 1956). Consequently, study of the genetic diversity of the genetic resources of such species (including studies involving wheat evolution) may provide significant information regarding their potential for breeding purposes.…”

Section: Introductionmentioning

confidence: 99%

Optimum Sample Size for Estimating Gene Diversity in Wild Wheat using AFLP Markers

Singh

Chabane

Valkoun

et al. 2006

Genet Resour Crop Evol

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Genetic diversity in five wild types of wheat was estimated using Simpson's index (based on heterozygosity) applied to data from AFLP markers. For such studies, the cost of obtaining the required information increases both with the number of samples required to estimate diversity and with the number of markers used. When the population studied is in Hardy-Weinberg equilibrium (HWE), allelic frequencies follow the binomial expansion and parametric methods can be used to calculate the variance of the diversity index in terms of the number of individuals sampled. Inbred species are never in HWE. With regard to such populations, this study addresses the question of the sample size required to estimate gene diversity using a distribution-free re-sampling method. We studied populations of five wild species (Aegilops speltoides, Triticum urartu, Triticum boeoticum, Triticum dicoccoides, and Triticum araraticum) as sources of diversity. We used bootstrap re-sampling with varying sample sizes to develop a relationship between the precision of the diversity estimate and the sample size. Such a relationship was used to determine the samples required for capturing a given amount of diversity and its precision. We found that 5-6 samples are sufficient to obtain a standard error equal to 10% of the diversity in the populations of the species Ae. speltoides, T. dicoccoides and T. araraticum. However, more than 12 samples would be needed for populations of T. urartu and T. boeoticum. The procedure presented here can be used to obtain the optimum sample size for other crop species as well.

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Section: Introductionmentioning

confidence: 99%

Optimum Sample Size for Estimating Gene Diversity in Wild Wheat using AFLP Markers

Singh

Chabane

Valkoun

et al. 2006

Genet Resour Crop Evol

View full text Add to dashboard Cite

show abstract

“…One plant showed w= 13. The tendency of the wild population seems to be to produce a majority of plants with chromosome numbers of from 2/2 = 48 to 2n = 52, resembling in some respects Kihara's (1919Kihara's ( , 1921 and Watkin's (1930) wheat hybrids, for 2« = 48 is the chromosome number of V. lutea while that of V. tricolor is 2« = 26. The increase is due to the splitting of univalents (vide also Clausen, 1931), some of which become incorporated in the daughter nuclei.…”

Section: Introductionmentioning

confidence: 89%