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  • 1
    Electronic Resource
    Electronic Resource
    An allele responsible for seedling death in Pinus radiata D. Don (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 640-644 
    Details
    ISSN: 1432-2242
    Keywords: Key words Lethal allele ; Dominance ; Inbreeding depression ; Segregation distortion ; Pinus radiata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  When inbred, most outcrossing species show high mortality, manifested at several life stages. The occurrence of homozygotes for deleterious or lethal alleles is believed to be responsible. Here, we report the identification of an allele responsible for the death of selfed Pinus radiata D. Don seedlings in their first month after germination. Among 291 S1 seedlings of plus-tree 850.55, 76 died within 1 month of emergence. Their death appears to be caused by a single recessive lethal allele, SDPr (seedling death in Pinus radiata). SDPr is located in a linkage group with 28 RAPD markers, the closest of which is ai05800a. Of the 76 seedlings that died, megagametophytes of 73 could be genotyped. Of these, 71 had the null (no band) allele of ai05800a; only two had the band allele. Of the 190 surviving S1 diploids that were genotyped, only two individuals were homozygous for the null allele of ai05800a. By two different methods, the map distance between SDPr and ai05800a was estimated to be between 1.0 and 2.7 cM respectively. The frequency of band and null alleles in the combined population of dead and surviving seedlings and in un-sown seeds shows no evidence of selection at this locus prior to germination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050783
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic analysis of inbreeding depression in plus tree 850.55 of Pinus radiata D. Don. II. Genetics of viability genes (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 140-146 
    Details
    ISSN: 1432-2242
    Keywords: Key words Segregation distortion ; Inbreeding depression ; Viability gene ; Lethal allele ; Pinus radiata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Most coniferous species exhibit severe inbreeding depression. Selfed individuals usually have decreased viability, reduced vigour and morphological defects. The number of filled seeds after selfing Pinus radiata plus tree 850.55 was 48% that of the outcrossing, and 26.1% of the selfed seedlings died at an early stage. The segregation of 172 markers (covering 56% of the genome) in selfed progenies of radiata pine plus tree 850.55 was studied. Based on the segregation ratio of the markers, genes associated with inbreeding depression on viability were identified (P〈0.05). Using the Expectation/Conditional Maximization (ECM) algorithm, we estimated the location, degree of dominance and selection coefficient of viability genes. Nine viability genes were discovered. Seven of them appeared to be dominant and one partially dominant (degree of dominance=0.4). The other gene was overdominant or pseudo-overdominant, with selection coefficients for the two homozygotes of 0.4 and 0.42, respectively. Of the genes showing dominance or partial dominance, seven were sub-lethal with selection coefficients ranging from 0.55 to 0.79; one gene (SDPr), which was responsible for seedling death within the first month following germination, was lethal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051218
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