Outcrossing rates and male sterility in natural populations of Plantago coronopus

1988 ◽  
Vol 76 (2) ◽  
pp. 190-196 ◽  
Author(s):  
K. Wolff ◽  
B. Friso ◽  
J. M. M. van Damme
Keyword(s):  
Male Sterility ◽  
Natural Populations ◽  
Outcrossing Rates ◽  
Plantago Coronopus

Evidence of high self-fertilization in natural populations of eastern white cedar (Thuja occidentalis)

1990 ◽  
Vol 68 (3) ◽  
pp. 663-668 ◽  
Author(s):  
Daniel J. Perry ◽  
Peggy Knowles
Keyword(s):  
Natural Populations ◽  
Outcrossing Rate ◽  
Significant Heterogeneity ◽  
Embryo Survival ◽  
Thuja Occidentalis ◽  
White Cedar ◽  
Northwestern Ontario ◽  
Outcrossing Rates ◽  
Self Fertilization ◽  
Eastern White Cedar

Arrays of open-pollinated seeds were assayed for allozyme polymorphisms at four loci (Mdh-1, Me, 6Pg-2, and Pgm) to obtain estimates of outcrossing rates for three eastern white cedar populations in northwestern Ontario, Canada. Multilocus population outcrossing rate estimates were low, ranging from 0.507 to 0.745, with significant heterogeneity among populations. Low stand densities and relatively high selfed embryo survival may have contributed to the low effective outcrossing rates observed. Single-tree multilocus outcrossing rate estimates were obtained for nine trees from one population. When estimated jointly with outcross pollen pool allele frequencies, these outcrossing rate estimates ranged from 0.253 to 1.023 with significant heterogeneity among trees. Key words: mating system, outcrossing rate, Thuja occidentalis L.

Low levels of outcrossing in Pinus leucodermis: further evidence in artificial stands

1994 ◽  
Vol 72 (9) ◽  
pp. 1289-1293 ◽  
Author(s):  
M. Morgante ◽  
P. Rossi ◽  
G. G. Vendramin ◽  
G. Boscherini
Keyword(s):  
Natural Populations ◽  
Selective Advantage ◽  
Minimum Variance ◽  
Outcrossing Rates ◽  
Self Fertilization ◽  
Low Levels ◽  
High Level ◽  
Germinating Seeds ◽  
Neighbourhood Structure ◽  
Key Words Mating System

Outcrossing rates were estimated in two artificial stands of Pinus leucodermis, a wind pollinated conifer characterized by a relatively high level of selfing. Multilocus outcrossing rates, estimated by assaying five enzyme loci, were lower than 86% in the two stands, using both dormant and germinating seeds, and not different from those observed in two natural populations located in the same area. The lack of relevant differences between single-locus minimum variance means and the multilocus outcrossing rate estimates observed in both the artificial stands indicates that most of the apparent selfing is probably caused by actual self-fertilization. The presence of a high level of self-fertilization in this species seems confirmed also in artificial stands, where the density is higher and neighbourhood structure should be less pronounced. The high level of self-fertilization found in P. leucodermis, which is probably due to the presence of a reduced number of recessive embryonic lethals as a consequence of genetic drift, could represent a selective advantage for this pioneering and precocius species. Key words: mating system, outcrossing rates, artificial stands, Pinus leucodermis.

Regional divergence and inbreeding in Eucalyptus cladocalyx (Myrtaceae)

2003 ◽  
Vol 51 (4) ◽  
pp. 393 ◽  
Author(s):  
M. W. McDonald ◽  
M. Rawlings ◽  
P. A. Butcher ◽  
J. C. Bell
Keyword(s):  
Genetic Diversity ◽  
Natural Populations ◽  
South Australia ◽  
Natural Distribution ◽  
Flinders Ranges ◽  
Outcrossing Rates ◽  
Low Levels ◽  
Western Victoria ◽  
Ornamental Species ◽  
Regional Divergence

Eucalyptus cladocalyx F.Muell. is a widely cultivated tree in dryland southern Australia. It is grown for firewood, timber production and as a windbreak and ornamental species. Natural populations of E. cladocalyx are endemic to South Australia where they occur in three disjunct regions. This study assessed the mating system and patterns of genetic diversity in natural populations of E. cladocalyx by using allozymes. Populations had relatively low levels of genetic diversity (HE = 0.148) and high levels of genetic divergence (θ = 0.26) among populations, similar to other regionally distributed eucalypts. Populations clustered into three distinct groups, which corresponded to its disjunct natural distribution. Genetic differentiation among populations and between regions was highly significant. Relatively high levels of inbreeding (tm = 0.57) were detected in natural populations of E.�cladocalyx. Outcrossing rates were highly variable among families, ranging from 0 to 100%. One-third of families from four populations had outcrossing rates that were not significantly different from zero. The origins of three commercially significant, cultivated stands of E. cladocalyx were also assessed. Allozyme profiles of cultivated stands from Wail and Lismore in western Victoria suggested origins in the Wirrabara region of the southern Flinders Ranges, while a cultivated stand of E. cladocalyx var. nana Hort. ex Yates had an allozyme profile consistent with origins in the Eyre Peninsula region. The results are discussed in relation to the species' morphological variation, biogeography and the implications for its domestication and conservation.

scholarly journals Outcrossing rates in an experimentally admixed population of self-compatible and self-incompatible Arabidopsis lyrata

Heredity ◽  
2021 ◽  
Author(s):  
Christina Steinecke ◽  
Courtney E. Gorman ◽  
Marc Stift ◽  
Marcel E. Dorken
Keyword(s):  
Gene Flow ◽  
Natural Populations ◽  
Secondary Contact ◽  
Uniform Density ◽  
Evolutionary Divergence ◽  
Arabidopsis Lyrata ◽  
Multiple Origins ◽  
Outcrossing Rates ◽  
Self Fertilization ◽  
Self Compatibility

AbstractThe transition to self-compatibility from self-incompatibility is often associated with high rates of self-fertilization, which can restrict gene flow among populations and cause reproductive isolation of self-compatible (SC) lineages. Secondary contact between SC and self-incompatible (SI) lineages might re-establish gene flow if SC lineages remain capable of outcrossing. By contrast, intrinsic features of SC plants that reinforce high rates of self-fertilization could maintain evolutionary divergence between lineages. Arabidopsis lyrata subsp. lyrata is characterized by multiple origins of self-compatibility and high rates of self-fertilization in SC-dominated populations. It is unclear whether these high rates of selfing by SC plants have intrinsic or extrinsic causes. We estimated outcrossing rates and examined patterns of pollinator movement for 38 SC and 40 SI maternal parents sampled from an admixed array of 1509 plants sourced from six SC and six SI populations grown under uniform density. Although plants from SI populations had higher outcrossing rates (mean tm = 0.78 ± 0.05 SE) than plants from SC populations (mean tm = 0.56 ± 0.06 SE), outcrossing rates among SC plants were substantially higher than previous estimates from natural populations. Patterns of pollinator movement appeared to contribute to lower outcrossing rates for SC plants; we estimated that 40% of floral visits were geitonogamous (between flowers of the same plant). The relatively high rates of outcrossing for SC plants under standardized conditions indicate that selfing rates in natural SC populations of A. lyrata are facultative and driven by extrinsic features of A. lyrata, including patterns of pollinator movement.

scholarly journals Gender variation, partial male sterility and labile sex expression in gynodioecious Plantago coronopus

1996 ◽  
Vol 132 (1) ◽  
pp. 67-76 ◽  
Author(s):  
HANS P. KOELEWIJN ◽  
JOS M. M. DAMME
Keyword(s):  
Male Sterility ◽  
Sex Expression ◽  
Gender Variation ◽  
Plantago Coronopus

Cytoplasmic suppression of Ogura cytoplasmic male sterility in European natural populations of Raphanus raphanistrum

2007 ◽  
Vol 114 (8) ◽  
pp. 1333-1343 ◽  
Author(s):  
Sandra Giancola ◽  
Yong Rao ◽  
Sophie Chaillou ◽  
Sophie Hiard ◽  
Alfred Martin-Canadell ◽  
...  
Keyword(s):  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Natural Populations ◽  
Raphanus Raphanistrum

scholarly journals No male sterility gene on B chromosomes in Plantago coronopus

Heredity ◽  
1983 ◽  
Vol 51 (2) ◽  
pp. 429-433 ◽  
Author(s):  
S S Raghuvanshi ◽  
Girjesh Kumar
Keyword(s):  
Male Sterility ◽  
B Chromosomes ◽  
Sterility Gene ◽  
Male Sterility Gene ◽  
Plantago Coronopus

scholarly journals Outcrossing rates and heterozygosity in natural populations of Hordeum spontaneum Koch in Israel

Heredity ◽  
1978 ◽  
Vol 41 (1) ◽  
pp. 49-62 ◽  
Author(s):  
A H D Brown ◽  
D Zohary ◽  
E Nevo
Keyword(s):  
Natural Populations ◽  
Hordeum Spontaneum ◽  
Outcrossing Rates

Outcrossing rates and organelle inheritance estimated from two natural populations of the Japanese endemic conifer Sciadopitys verticillata

2014 ◽  
Vol 127 (5) ◽  
pp. 617-626 ◽  
Author(s):  
James R. P. Worth ◽  
Masashi Yokogawa ◽  
Yuji Isagi
Keyword(s):  
Natural Populations ◽  
Organelle Inheritance ◽  
Outcrossing Rates ◽  
Sciadopitys Verticillata
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