Further Inbreeding Studies With Douglas Fir

Orr-Ewing, A. L.

doi:10.5558/tfc33318-4

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Most of the detailed studies of self-incompatibility, whether in Pinus [23], Pseudotsuga [33], or Thuja [41] have not discussed secretions and their effect on early pollen growth, as selfed crosses generally failed only after fertilization. Other studies claim that prezygotic selfincompatibility mechanisms are in the nucellus [27] and in the archegonium [49].…”

Section: Breeding Barriers and Ovular Secretions: Facts And Thoughtsmentioning

confidence: 99%

Ovular secretions as part of pollination mechanisms in conifers

Gelbart

Aderkas

2002

Ann. For. Sci.

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-Conifers have a diversity of pollination mechanisms that assist in the capture of pollen during pollination. Pollination mechanisms can be divided into a number of general types depending on whether they have an ovular secretion that interacts with the pollen. These types include mechanisms that never have a secretion, or those that have a delayed secretion, or the most common type in which a pollination drop is formed. This review outlines the evolutionary context of ovular secretions, describes the origins of these secretions within the ovule, their function in the two types of pollination mechanisms, and details the biochemical composition of these liquids. Not only do ovular secretions provide a germination medium for pollen, but they may also play a significant part in reducing pollen pollution by foreign species. pollination mechanism / conifer / ovular secretion / pollination drop Résumé -Les sécrétions ovulaires : leurs rôles dans les mécanismes de pollinisation des conifères. Les conifères possèdent divers mécanismes de pollinisation qui aident à la capture des grains de pollen lors de la pollinisation. Ces mécanismes peuvent être classés en quelques types généraux selon qu'une sécrétion ovulaire interagissant avec le pollen existe ou non. Ces différents types comprennent des mécanismes sans sécrétion, avec sécrétion retardée ou, et c'est le type le plus répandu, avec formation d'une goutte de pollinisation. Cet article décrit le contexte de ces secretions en terme d'évolution, leurs origines ovulaires, leurs fonctions dans les deux types de mécanis-mes de pollinisation, et leur composition biochimique. Les sécrétions ovulaires non seulement fournissent un milieu favorable à la germination du pollen, mais peuvent aussi diminuer de façon importante la pollution pollinique due à des pollens étrangers. mécanisme de pollinisation / conifère / sécrétion / goutte de pollinisation

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Section: Breeding Barriers and Ovular Secretions: Facts And Thoughtsmentioning

confidence: 99%

Ovular secretions as part of pollination mechanisms in conifers

Gelbart

Aderkas

2002

Ann. For. Sci.

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“…Although self-incompatibility has been reported in ferns, it was shown to be a simple case of genetic load (32), that is, outbreeding produced more viable offspring than inbreeding did. Similarly, indications of self-incompatibility within the gymnosperms were later shown to be the expression of deleterious recessives (33). With the proposed interpretation of gametophytic self-incompatibility in the angiosperms, a similar conclusion is reached.…”

Section: Nature Of the Incompatibility Supergenementioning

confidence: 57%

Gametophytic Self-Incompatibility Reexamined

Mulcahy

1983

Science

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The conventional hypothesis of gametophytic self-incompatibility in the angiosperms involves one to four multiallelic incompatibility loci and the positive inhibition of incompatible pollen tubes. However, this concept does not accommodate recent experimental data indicating that there may be many loci. An alternative hypothesis which incorporates many loci and complementary pollen-style interactions suggests that there may be no S gene, as previously thought, and that gametophytic self-incompatibility is perhaps merely one aspect of extensive pollen-style interactions.

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The nature of inbreeding in a seed orchard of Douglas fir as shown by an efficient multilocus model

Ritland

El‐Kassaby

1985

Theoret. Appl. Genetics

114

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The amounts of self-fertilization versus consanguineous matings (as measured by effective selfing) was estimated in a seed orchard of Douglas-fir, using progeny array data at six allozyme loci. The orchard is family structured, consisting several grafts (clones) and/or open-pollinated (o-p) progeny from each of several 'plus-trees'. Population-wide selfing rates were found to be 7% for the o-p trees and 2% for the cloned trees. Estimates of mating system parameters for individual trees showed this difference for average outcrossing rate t (1) still largely remained when outcrossingpollen gene frequency p was not allowed to vary among trees and (2) disappeared when p was allowed to vary among trees. Under this joint t and p estimation, o-p trees showed both significant variation of t (based upon a one-way ANOVA grouped by common plus-tree) and significant regressions of p on ovule genotype (indicative of consanguineous matings); cloned trees showed neither. This higher rate of consanguineous mating for o-p trees might be explained by the larger and more variable size of o-p families in the orchard. Estimates of outcrossing rate t and outcrossingpollen gene frequency p were based upon a multilocus model which makes full use of the information in the data. The increased information it gives over 'observed outcross' models is equivalent to adding 30-50% more loci, and it gives enough degrees of freedom to jointly estimate t and p for individual trees (individual progeny arrays) under certain conditions. In addition, inclusion of megagametophyte data nearly doubles the information about the mating system of individual trees.

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Further Inbreeding Studies With Douglas Fir

Cited by 5 publications

References 7 publications

Ovular secretions as part of pollination mechanisms in conifers

Ovular secretions as part of pollination mechanisms in conifers

Gametophytic Self-Incompatibility Reexamined

The nature of inbreeding in a seed orchard of Douglas fir as shown by an efficient multilocus model

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