Marker-based estimation of coefficient of coancestry in rice

In early successional species, short life span and frequent spatial relocation may affect the distribution of genetic variation but the pattern may be altered by reproductive patterns. Passiflora incarnata L. (Passifloraceae), an early successional vine found throughout the southeastern United States, reproduces sexually and asexually through clonal sprouts. We examined the genetic structure of P. incarnata in recently disturbed habitats at three spatial scales: within a patch, among patches separated by 250 m, and between sites separated by 10 km. Genetic variation may be clumped at the scale of neighboring plants if stem resprouting is significant. In each patch, eleven arbitrarily selected plants and their four nearest neighbors were mapped and leaf samples were collected for genetic analysis. The multilocus genotype of each individual for seven polymorphic allozymes was determined. Potential clones were determined by estimating the probability of a second occurrence of each genotype and a multilocus coefficient of coancestry. Data indicated P. incarnata was reproducing primarily sexually. Most of the genetic variation was within a patch with little variation among patches. These data suggest that the genetic structure of this colonizing species was determined by founder effects interacting with long distance pollen movement.Key words: allozymes, passionflower, spatial, genetic structure, early colonizer, Passiflora incarnata.

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Parental contribution and coefficient of coancestry among maize inbreds: pedigree, RFLP, and SSR data

Theoretical and Applied Genetics ◽

10.1007/s001220050072 ◽

2000 ◽

Vol 100 (3-4) ◽

pp. 552-556 ◽

Cited By ~ 2

Author(s):

R. Bernardo ◽

J. Romero-Severson ◽

J. Ziegle ◽

J. Hauser ◽

L. Joe ◽

...

Keyword(s):

Parental Contribution ◽

Maize Inbreds ◽

Coefficient Of Coancestry

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Coefficient of Coancestry (kinship, consanguinity)

Encyclopedia of Genetics, Genomics, Proteomics and Informatics ◽

10.1007/978-1-4020-6754-9_3275 ◽

2008 ◽

pp. 384-384

Keyword(s):

Coefficient Of Coancestry

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PLUM VARIETIES USED AS PARENTS IN ROMANIAN BREEDING PROGRAM

FRUIT GROWING RESEARCH ◽

10.33045/fgr.v37.2021.01 ◽

2021 ◽

Vol 37 (37) ◽

pp. 6-13

Author(s):

Mădălina Butac ◽

Keyword(s):

Genetic Diversity ◽

Clonal Selection ◽

Genetic Resistance ◽

Inbreeding Coefficient ◽

Prunus Domestica ◽

Breeding Programs ◽

The Mean ◽

Coefficient Of Coancestry ◽

Plum Varieties ◽

Genetic Contributions

There are about three thousand varieties belonging to Prunus domestica available at present worldwide that can be used as genitors in plum breeding activity. An analysis of the pedigrees of plum cvs. developed in Romanian breeding programs shows that the most are descended from ‘Tuleu gras’, ‘Renclod Althan’, ‘Anna Späth’, ‘Stanley’ and ‘Early Rivers’, called 'ancestors'. That means the majority of plum cvs. have at least one of the ancestors as parent or grandparent. For those 40 plum cvs. registered in Romania in 60 years an increased number of crosses with these 'ancestors' has led to what we call 'inbreeding'. According to data presented in this paper, ‘Tuleu gras’ cv. was the most frequently used parent in the cross combinations, giving origin to 23 cvs. Among the other frequently used genitors were: ‘Renclod Althan’ (7 cvs.), ‘Anna Späth’ (3 cvs.) and ‘Stanley’ (1 cv.). Many of the cultivars – 32 altogether (80%) have originated from hybridization, whereas 4 cvs. have originated from open pollination, others 3 cvs. from mutagenesis and 1 cv. from clonal selection. The goal of this work is to measure genetic diversity presently use in Romanian plum breeding. Pedigrees of each cv. were used to study the genetic contributions of ancestor. Of the 40 cvs. analyzed, 33 had an inbreeding coefficient other than zero. The overall mean inbreeding coefficient was 0.419 for all cvs., where their parentages were known. For cvs. with unknown parentage (nonrelated with known parentage) the inbreeding coefficient is zero. The mean coefficient of coancestry of 40 plum cvs. are 0.081 with ‘Tuleu gras’ cv., 0.019 with ‘Renclod Althan’ and ‘Anna Späth’ cvs., 0.017 with ‘Early Rivers’ cv., 0.014 with ‘d’Agen’ and ‘Renclod Violet’ cvs. and 0.005 with Stanley cv. In conclusion, plum breeders have worked with populations of greatly reduced genetic diversity and this strategy becomes a problem because it leads to genetic impoverishment, and, also, the loss of the genetic resistance to different diseases.

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Randomly Amplified Polymorphic DNAs in the Cultivated Strawberry, Fragaria ×ananassa

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.119.4.862 ◽

1994 ◽

Vol 119 (4) ◽

pp. 862-864 ◽

Cited By ~ 14

Author(s):

J.F. Hancock ◽

P.A. Callow ◽

Douglas V. Shaw

Keyword(s):

Polymerase Chain Reaction ◽

Genetic Map ◽

Fragaria Ananassa ◽

Chain Reaction ◽

Banding Patterns ◽

Amplification Profile ◽

Polymerase Chain ◽

Coefficient Of Coancestry ◽

Dna Primers ◽

Strawberry Cultivars

Eight strawberry cultivars or advanced selections from the Univ. of California, Davis, breeding program were screened for polymorphisms using the polymerase chain reaction (PCR) and 43 random 10-base DNA primers. Over 60% of the primers screened resulted in replicable polymorphic banding patterns (amplification profiles), and a subset of ten primers that exhibited high levels of amplification profile polymorphism was used to identify each of the eight genotypes uniquely. There was also a significant product-moment correlation (r = 0.64, P < 0.01) between number of shared amplification profile phenotypes and pairwise coefficient of coancestry. This technology shows high promise as a means of verifying the identity of cultivars and developing a genetic map of the octoploid cultivated strawberry.

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