Growth of Incompatible Pollen Tubes in Oenothera organensis

Emerson, Sterling

doi:10.1086/334923

Cited by 72 publications

(52 citation statements)

References 5 publications

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“…Firstly, while the number of alleles in populations of Trifolium pratense (Williams & Williams, 1947;O'Donnell & Lawrence, 1984) and T repens (Atwood, 1944) appear to be large, this number appears to be much smaller in the two most thoroughly investigated species with a one-locus, multi-allelic, gametophytic system of self-incompatibility. Thus Emerson (1940) found 45 different S-alleles in Oenothera organensis and we have found, quite coincidentally, the same number in P. rhoeas. Furthermore, only 49 different S-alleles have been found in Brassica oleracea (Ockendon, 1985), which is the most extensively investigated species with a one-locus, multiallelic, sporophytic system of self-incompatibility.…”

Section: Discussionsupporting

confidence: 83%

The population genetics of the self-incompatibility polymorphism in Papaver rhoeas. VI. Estimation of the overlap between the allelelic complements of a pair of populations

1993

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The data obtained by cross-classifying the self-incompatibility (S -) alleles of samples taken at random from three natural populations of Papaver rhoeas, presented in the previous paper (Lawrence et al., 1993), are used here to estimate the extent of the overlap between the complements of alleles that pairs of these populations contain. These estimates indicate that this overlap is very great, so that these populations appear to contain essentially the same set of S-alleles. Three possible explanations of these results, which are not expected on the theory of the self-incompatibility polymorphism possessed by this species, are proposed and discussed. It is argued that the most likely of these alternative explanations is that the number of S-alleles in the species is not very much greater than the number of S-alleles that these natural populations contain, a hypothesis which is put to the test in the following paper.

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Section: Discussionsupporting

confidence: 83%

The population genetics of the self-incompatibility polymorphism in Papaver rhoeas. VI. Estimation of the overlap between the allelelic complements of a pair of populations

1993

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“…It is possible, however, that a population which is substructured into a number of groups of related individuals, because both pollen and seed dispersal is limited, might be capable of carrying more alleles at equilibrium that one in which mating is random. If true, this might explain why populations of long-lived perennial species that reproduce vegetatively, like Trifolium repens (Atwood, 1944) and T pratense (Williams & Williams, 1947) appear to contain many more alleles than those of either Oenothera organensis (Emerson, 1939(Emerson, , 1940 or P. rhoeas. In view of Wright's (1939) investigation of the amount of isolation required between subpopulations of Oe.…”

Section: Discussionmentioning

confidence: 99%

The population genetics of the self-incompatibility polymorphism in Papaver rhoeas. VII. The number of S-alleles in the species

Lane

Lawrence

1993

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The results obtained from the cross-classification of the S-alleles of a sample of 30 plants raised from the seed taken from a Spanish population against those of a sample taken from a British population revealed that 24 alleles of the former also occurred in the latter, giving an estimated overlap of 53 per cent between the allelic complements of these populations. These data indicate that the number of alleles in the species is unlikely to be much greater than 66. It is argued that the number of alleles in the species may be subject to a dynamic restraint on the number of alleles contained in its constituent populations and possibly, also, by a molecular restraint on the allelic diversity of the S-gene.

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“…This species also has an extremely long style ( 25 cm) which should increase the likelihood that small differences in pollen tube growth rate affect fertilization ability (Mulcahy, 1971). Oenothera organensis has a gametophytic selfincompatibility system (Emerson, 1940) and the plants used in this study were from a population maintained at Indiana University. The university population consists of several hundred individuals representing five characterized self-incompatibility alleles.…”

Section: Methodsmentioning

confidence: 99%

Differential seed maturation uncouples fertilization and siring success in Oenothera organensis (Onagraceae)

Havens

Delph

1996

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This study examines ovule fertilization and seed maturation success in an evening primrose, Oenothera organensis, using transgenic plants. The reproductive success of several pollen donors was compared using individuals transformed with the GUS (/3-glucuronidase) marker gene which allowed the genotype of developing ovules to be determined prior to seed abortion. This marker gene allowed us to discriminate between a pollen donor's success in fertilizing ovules and its success in siring seeds. Transformed plants had decreased microgametophytic vigour, as evidenced by lower than expected fertilization success in vivo and slower pollen tube growth rates in vitro. However, transformation had no apparent effect on offspring sporophytic vigour, including seed mass, seedling emergence and dry weight. This illustrates the effectiveness of fertilization competition in screening out poorly functioning haploid genomes as suggested by Mulcahy (1979). We found significant differences between the percentage of ovules fertilized and the percentage of seeds sired by a pollen donor in four of eight cases. Hence, fertilization success does not always predict seed paternity. The proportion of seeds sired by the transformed donor with very low fertilization success increased, whereas the proportion sired by the donor with relatively high fertilization success was reduced. This resulted in nearly equal siring ability for the two donors in spite of their difference in fertilization ability.

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Growth of Incompatible Pollen Tubes in Oenothera organensis

Cited by 72 publications

References 5 publications

The population genetics of the self-incompatibility polymorphism in Papaver rhoeas. VI. Estimation of the overlap between the allelelic complements of a pair of populations

The population genetics of the self-incompatibility polymorphism in Papaver rhoeas. VI. Estimation of the overlap between the allelelic complements of a pair of populations

The population genetics of the self-incompatibility polymorphism in Papaver rhoeas. VII. The number of S-alleles in the species

Differential seed maturation uncouples fertilization and siring success in Oenothera organensis (Onagraceae)

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