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Implications of the variance effective population size on the genetic conservation of monoecious species

By: Crossa, J.
Contributor(s): Vencovsky, R [coaut.].
Material type: materialTypeLabelArticlePublisher: 1994ISSN: 1432-2242 (Revista en electrónico).Subject(s): Gametes | Genetic variation | Germplasm conservation | Plant population AGROVOC | Population change | Preservation | Genetic resources In: Theoretical and Applied Genetics v. 89, no. 7-8, p. 936-942999490Summary: The concept of variance effective population size (Ne(v)) and other expressions are reviewed and described for specific sampling steps in plant germplasm collection and regeneration of monoecious species. Special attention is given to procedures for computing the variance of the number of contributed gametes (V(k)) to the next generation. Drift, as it occurs between generations, was considered to contain a component due to the sampling of parents and a subsequent component due to the sampling of gametes. This demonstrates that drift, caused by reduction of seed viability, damages the genetic integrity of accessions stored in germplasm banks. The study shows how mating designs, such as plant-to-plant or chain crossings with additional female gametic control, can partially alleviate this problem. Optimal procedures for increasing Ne(v) when collecting germplasm in the field are also discussed. The effect of different female and male gametic control strategies on Ne(v) is considered under several situations. Practical examples illustrating the use of V(k) and Ne(v) expressions are givenCollection: CIMMYT Staff Publications CollectionCollection: Serials Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

Look under journal title (Browse shelf) 1 Available 999490
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Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0040-5752

The concept of variance effective population size (Ne(v)) and other expressions are reviewed and described for specific sampling steps in plant germplasm collection and regeneration of monoecious species. Special attention is given to procedures for computing the variance of the number of contributed gametes (V(k)) to the next generation. Drift, as it occurs between generations, was considered to contain a component due to the sampling of parents and a subsequent component due to the sampling of gametes. This demonstrates that drift, caused by reduction of seed viability, damages the genetic integrity of accessions stored in germplasm banks. The study shows how mating designs, such as plant-to-plant or chain crossings with additional female gametic control, can partially alleviate this problem. Optimal procedures for increasing Ne(v) when collecting germplasm in the field are also discussed. The effect of different female and male gametic control strategies on Ne(v) is considered under several situations. Practical examples illustrating the use of V(k) and Ne(v) expressions are given

Genetic Resources Program

English

R94ANALY|Springer|BIO|1

CCJL01

CIMMYT Staff Publications Collection

Serials Collection

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