Variation in allele frequencies in the outcross pollen pool of Eucalyptus regnans F. Muell. throughout a flowering season

Fripp, Yvonne J; Griffin, A. R.; Moran, G. F.

doi:10.1038/hdy.1987.111

Cited by 25 publications

(21 citation statements)

References 21 publications

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“…Temporal heterogeneity in gene frequencies of gamete and zygote pools can be induced by variation in flowering time or fecundity within a population (Gregorius et at., 1986;Fripp et al, 1987;Sampson et *Correspondence. at., 1990). Differentiation on a relatively small scale, loss of alleles caused by genetic drift and/or a certain amount of inbreeding may appear within populations as a consequence of the different types of driving force.…”

Section: Introductionmentioning

confidence: 99%

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

1994

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The intraspecific genetic structure of a mixed population of sessile and pedunculate oak was studied in the Petite Charnie Forest, Sarthe, France, using enzyme electrophoresis. Spatial structure was analysed by calculating F-statistics and autocorrelations at different scales of spatial subdivision of the population. F-statistics were also used to compare the genetic structure of groups of trees subdivided according to the phenology of flowering. Spatial organization of phenology of flowering was studied with autocorrelation methods. In both species, a highly significant heterozygote deficiency was found at the population level. Spatial genetic structure was at least partially responsible for this deficiency, as demonstrated by the variations observed in F-statistics in relation to the size of this population subdivision. The significance of the observed structure was confirmed by comparison with a null hypothesis generated with the help of permutation analysis. We suggest that the limited dispersal of pollen and/or seeds in the stand gave rise to a family structure. The autocorrelation in phenology of flowering found in both species could contribute to lower the neighbourhood size and then to increase the Wahlund effect. Autocorrelation analyses allowed us to show that heterogeneity of patterns of structure among loci was present. Other possible causes of the genetic structure and its heterogeneity are discussed.

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Section: Introductionmentioning

confidence: 99%

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

1994

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“…(1986) found that temporal variation in the allele frequencies of the pollen pool may have contributed to low estimates of I at two marker loci that themselves affect time of flowering or are associated with alleles of loci that affect time of flowering. In contrast, Fripp et al (1987) found no evidence of biased single-locus I estimates due to the demonstrated temporal heterogeneity of allele frequencies in E. regnans.…”

Section: Discussionmentioning

confidence: 47%

“…A similar observation was made for an isolated stand of the mass flowering forest tree E. regnans (Fripp et al, 1987).…”

Section: Discussionmentioning

confidence: 86%

“…Instead, the methods of calculating pollen allele frequencies were compared using the sum of log likelihoods for all plants (Kendall and Stuart, 1961;Fripp et al, 1987). Approximately 67 per cent of flowers were estimated to have been releasing pollen between day 146 (May) and day 279 (September).…”

Section: Methodsmentioning

confidence: 99%

“…Method (1) jointly estimates I and pollen allele frequencies. For the remaining four methods the I giving the maximum likelihood were found by the method of Fripp et al (1987) in which the expected genotype frequencies in the progeny were obtained using the conditional probabilities given in Clegg et a!. (1978).…”

Section: Methodsmentioning

confidence: 99%

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Temporal variation in allele frequencies in the pollen pool of Eucalyptus rhodantha

Sampson

Hopper²,

James

1990

Heredity

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6065.Investigation of the mallee Eucalyptus rhodantha which has an irregular, protracted flowering period demonstrated that individual plants differ in fecundity and phenology and that allele frequencies in the pollen pool change during the flowering season. Allele frequencies of the pollen pool were estimated by several methods which either assumed temporal homogeneit1 or took flowering phenology into account. These allele frequencies were compared for their abilities to estimate r. The estimates of t based on allele frequencies which took phenology into account were not consistently higher or better than those that did not at any of the four loci surveyed. Changes in the allele frequencies of the pollen pool during the flowering season may contribute to variation between some single-locus estimates of t in E. rhodantha which assume temporal homogeneity, but it was concluded that they are not the major cause of bias.

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Consequences of Emergence Phenology for Reproductive Success in Ranunculus Adoneus (Ranunculaceae)

Galen

Stanton

1991

American J of Botany

105

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This study explores the effects ofemergence time and reproductive phenology on seed number, seed size, and seedling survival in a population of the alpine buttercup, Ranunculus adoneus. Phenology in this snow bowl population is structured by snow depth. Plants in late melting interior portions of the bowl emerged and flowered 3 to 4 wk after those in early melting zones at the bowl perimeter during the summers of 1988 and 1989. Flowering time differences of buttercups across the bowl were consistent from one year to the next. In 1988, late flowering plants tended to set fewer seeds than early flowering ones; in 1989 no decrease in seed number accompanied flowering date. Path analysis showed that equal fecundity in early and late emerging portions of the bowl population during 1989 resulted from balancing spatial and temporal constraints on seed production. Spatial aspects of habitat quality improved toward the interior of the bowl, but temporal regimes deteriorated in these late melting sites. In both 1988 and 1989 seed size declined with delays in flowering. Path analysis of 1989 data showed that because of reduced time for seed growth, plants in late melting portions of the bowl set smaller seeds than those in earlier melting zones. Differences in seed size due to parental phenology are likely to influence fitness in snow buttercups. Under natural conditions, seedlings from large seeds (~0.65 mg) have sixfold higher survival than do those from smaller seeds «0.65 mg). We conclude that seedling recruitment may be infrequent in late-melting portions of the snow bowl due to delayed parental phenology.

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Variation in allele frequencies in the outcross pollen pool of Eucalyptus regnans F. Muell. throughout a flowering season

Cited by 25 publications

References 21 publications

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

Intraspecific genetic structure in a mixed population of Quercus petraea (Matt.) Leibl and Q. robur L.

Temporal variation in allele frequencies in the pollen pool of Eucalyptus rhodantha

Consequences of Emergence Phenology for Reproductive Success in Ranunculus Adoneus (Ranunculaceae)

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