The Evolution of Autogamy in Species of the Mustard Genus Leavenworthia

Solbrig, Otto T.; Rollins, Reed C.

doi:10.2307/2407748

Cited by 63 publications

(67 citation statements)

References 13 publications

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“…Leavenworthia stylosa and some populations of L. crassa and L. alabamica are self-incompatible. Some populations of both L. crassa and L. alabamica are selfcompatible, with varying frequencies of selffertilization, whereas L. uniflora, L. torulosa and L. exigua are uniformly self-compatible and highly inbreeding (Lloyd, 1965;Solbrig & Rollins, 1977). Four independent comparisons between more outcrossing and more inbreeding populations are thus possible.…”

Section: The Genus Leavenworthiamentioning

confidence: 99%

“…Some data on plants of the mustard genus, Leavenworthia, are reported here. This genus is a classic example of breeding system evolution (Lloyd, 1965;Solbrig & Rollins, 1977;Lyons & Antonovics 1991). The general aim of the work was to estimate genetic diversity from populations with different levels of inbreeding, to test whether inbreeding populations have lower diversity than outbreeding ones, and to estimate the magnitude of any such difference, for comparison with the results on DNA sequence diversity (Liu et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Allozyme diversity in Leavenworthia populations with different inbreeding levels

CHARLESWORTH

YANG

1998

Heredity

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Levels of allozyme diversity were studied in five species of the annual plant genus Leavenworthia. The breeding systems of the populations were also characterized in terms of measures of autogamous seed-set and self-fertility. The populations that appeared more inbreeding by these criteria also tended to have lower within-population gene diversity (H S ) values, but there was nevertheless considerable allozyme variability in two of the four sets of inbred populations studied. Comparing the outcrosser L. stylosa and the related inbreeders L. uniflora and L. torulosa the reduction in diversity associated with inbreeding was very high, as no variants were seen within populations of the inbreeders. In L. crassa and L. alabamica, the reduction was lower, but correcting for the fact that this comparison is over less extreme selfing rate differences, it is estimated that the difference between extreme inbreeding and outcrossing populations of L. crassa considerably exceeds twofold. These results are compared with published studies within closely related taxa with different inbreeding levels. The effect of inbreeding on allozyme diversity is consistently larger than has been estimated from comparisons of unrelated species.

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Section: The Genus Leavenworthiamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Allozyme diversity in Leavenworthia populations with different inbreeding levels

CHARLESWORTH

YANG

1998

Heredity

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“…The numerous examples of breeding system evolution in plants (Baker, 1955;Crowe, 1964;Baker, 1966;Antonovics, 1968;Solbrig and Rollins, 1977;Charlesworth and Charlesworth, 1978;Brown and Jain, 1979) indicate that the ecological and genetic consequences of breeding systems vary in time and space. One of the most common breeding system changes is the evolution of selfing from an outcrossing ancestor (Stebbins, 1957;Crowe, 1964).…”

Section: Breeding System Evolutionmentioning

confidence: 99%

BREEDING SYSTEM AND HABITAT EFFECTS ON FITNESS COMPONENTS IN THREE NEOTROPICALCOSTUS(ZINGIBERACEAE)

Schemske

1983

Evolution

160

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“…Self-fertilization has several potential advantages: 1) fathering more offspring via a combination ofself-fertilization and contributing male gametes to other individuals (Fisher, 1941;Kimura, 1958;Nagylaki, 1976;Maynard Smith, 1978;Lloyd, I 1979; Wells, 1979;Holsinger et aI., 1984;Lande and Schemske, 1985;Uyenoyama, 1986;Holsinger, 1988), 2) reproductive assurance-enhanced female reproductive success from the production of more seeds when outcrossers seed set is pollinationlimited (Levin, 1973;Jain, 1976;Solbrig, 1976;Solbrig and Rollins, 1977;Lloyd, 1979), and 3) producing locally adapted progeny that carry beneficial genes or multilocus gene complexes (Stebbins, 1957;Grant, 1958;Allard et aI., 1968Allard et aI., , 1977Antonovics, 1968). Despite the theoretical importance ofinbreeding depression in mating system evolution, there are very limited empirical data on the relationship of inbreeding depression and the mating system (Charlesworth and Charlesworth, 1987).…”

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confidence: 99%

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

1990

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Abstract. -Inbreeding depression is commonly observed in natural populations. The deleterious effects of forced inbreeding are often thought to be less pronounced in populations with seifpollinating mating systems than in primarily outcrossing populations. We tested this hypothesis by comparing the performance of plants produced by artificial self-and cross-pollination from three populations whose outcrossing rate estimates were 0.03, 0.26, and 0.58. Outcrossing rates and inbreeding coefficients were estimated using isozyme polymorphisms as genetic markers. Analysis of F statistics suggests that biparental inbreeding as well as self-fertilization contribute to the level of homozygosity in the seed crop. Biparental inbreeding will reduce the heterozygosity of progeny produced by outcrossing, relative to random outcrossing expectations, and hence will reduce the effects of outcrossing versus self-fertilization. Heterotic selection may increase the average heterozygosity during the life history. Selfed and outcrossed seeds from all three populations were equally likely to germinate and survive to reproduce. However, inbreeding depression was observed in fecundity traits of plants surviving to reproduction in all three populations. Even in the population whose natural self-fertilization rate was 97%, plants grown from seed produced by self-pollination produced fewer fruits and less total seed weight than plants grown from outcrossed seed. There was no detectable inbreeding depression in estimated lifetime fitness. Inbreeding effects for all reproductive yield characters were most severe in the accession from the most outcrossing population and least severe in the accession from the most self-fertilizing population.

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The Evolution of Autogamy in Species of the Mustard Genus Leavenworthia

Cited by 63 publications

References 13 publications

Allozyme diversity in Leavenworthia populations with different inbreeding levels

Allozyme diversity in Leavenworthia populations with different inbreeding levels

BREEDING SYSTEM AND HABITAT EFFECTS ON FITNESS COMPONENTS IN THREE NEOTROPICALCOSTUS(ZINGIBERACEAE)

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

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