Microsteris, Phlox, and an Intermediate

Wherry, Edgar T.

doi:10.2307/2804876

Cited by 7 publications

(12 citation statements)

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“…It is likely that this relationship will hold with increased sampling of western Phlox taxa and additional sampling of M. gracilis. Notable differences exist between the genera with respect to flower and seed morphology (see Wherry, 1943Wherry, , 1955Grant, 1959); moreover, the annual habit is independently derived in Microsteris, which is clearly not closely related to P. drummondii as hypothesized by Mason (1941) when he argued for lumping the two genera. Segregation of the monotypic Microsteris thus becomes a judgment call on the taxonomic significance of the characters in question.…”

Section: Implications Of Congruence Between the Cpdna And Its Phylogementioning

confidence: 90%

“…In addition, six samples of western taxa were included (four species). We also sampled the monotypic genus Microsteris, which is clearly closely related to Phlox based on molecular phylogenetic studies of the family Polemoniaceae (Steele and Vilgalys, 1994;Johnson et al, 1996;Porter, 1996;Bell, Patterson, and Hamilton, 1999;Prather, Ferguson, and Jansen, 2000) as well as morphological data (Wherry, 1943;Grant, 1959Grant, , 1998. The segregation of this genus has been controversial: some workers have recognized Microsteris gracilis within Phlox as P. gracilis (Hook.)…”

Section: Sampling and Dna Extraction-seventy-sixmentioning

confidence: 99%

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A chloroplast DNA phylogeny of easternPhlox(Polemoniaceae): implications of congruence and incongruence with the ITS phylogeny

Ferguson

Jansen²

2002

American J of Botany

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The comparison of independent phylogenies is a valuable approach to the study of evolutionary pattern and process. Available data on eastern North American Phlox, including our recent ITS phylogeny, suggest that relationships are complicated in the group and that hybridization may have been a contributing factor. We used restriction site data from the chloroplast genome to develop a second phylogeny for eastern Phlox. Sampling was the same as that for the ITS study and consisted of 79 samples (including all 22 eastern Phlox species and most eastern subspecies, as well as multiple populations of many taxa). The resulting cpDNA phylogeny agrees with the ITS phylogeny in many respects, strengthening earlier conclusions. Nevertheless, incongruence between the trees is noteworthy: many samples, particularly of members of the P. pilosa and P. glaberrima complexes, are placed in different clades. A variety of tests were carried out to assess congruence in terms of topological patterns, character congruence, and homogeneity of data sets. Significant conflict between the phylogenies is discussed in light of the hypothesis that hybridization has affected relationships in this genus.

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Section: Implications Of Congruence Between the Cpdna And Its Phylogementioning

confidence: 90%

Section: Sampling and Dna Extraction-seventy-sixmentioning

confidence: 99%

A chloroplast DNA phylogeny of easternPhlox(Polemoniaceae): implications of congruence and incongruence with the ITS phylogeny

Ferguson

Jansen²

2002

American J of Botany

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“…Interestingly, in these Phlox species there is little evidence for pollinator-mediated barriers to reproduction. All five species in our study have broadly geographically overlapping ranges (Wherry, 1955; Figure 1), and some even grow in immediate vicinity to each other. They have distinct flowering time peaks but broadly overlapping flowering periods, 'distinct but not mutually exclusive habitat requirements' (Hadley & Levin, 1969), and likely the same pollinators (Robertson, 1891(Robertson, , 1895(Robertson, , 1928Wherry, 1932Wherry, , 1933Grant & Grant, 1965).…”

Section: Discussionmentioning

confidence: 85%

“…Here, we investigate the mechanisms driving mechanical isolation between long and short styled species of Phlox wildflowers. Phlox is a genus of flowering plants with more than 60 species that are predominantly found in Northern America (Wherry, 1955;Ferguson & Jansen, 2002). The species used in this study, P. glaberrima ssp.…”

Section: Introductionmentioning

confidence: 99%

Mismatch between pollen and pistil size causes asymmetric mechanical reproductive isolation acrossPhloxspecies

Feller,

Burgin,

Lewis

et al. 2024

Preprint

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In flowering plants, pollen-pistil interactions can serve as an important barrier to reproduction between species. As the last barrier to reproduction before fertilization, interactions between these reproductive organs are both complex and important for determining a suitable mate. Here, we test whether differences in style length generate a post-mating prezygotic mechanical barrier between five species of perennialPhloxwildflowers with geographically overlapping distributions. We perform controlled pairwise reciprocal crosses between three species with long styles and two species with short styles to assess crossing success (seed set). We find that heterospecific seed set is broadly reduced compared to conspecific cross success and reveal a striking asymmetry in heterospecific crosses between species with different style lengths. To determine the mechanism underlying this asymmetric reproductive isolating barrier we assess pollen tube growthin vitroandin vivo. We demonstrate that pollen tubes of short-styled species do not grow long enough to reach the ovaries of long-styled species. We find that short-styled species also have smaller pollen and that both within and between species pollen diameter is highly correlated with pollen tube length. Our results support the hypothesis that the small pollen of short-styled species lacks resources to grow pollen tubes long enough to access the ovaries of the long-styled species, resulting in an asymmetrical, mechanical barrier to reproduction. Such mechanisms, combined with additional pollen-pistil incompatibilities, may be particularly important for closely related species in geographic proximity that share pollinators.

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“…Phlox L. is a predominantly North American plant genus comprising c . 65 species (Wherry 1955), making it the largest genus of the well-studied family Polemoniaceae (Grant 1959;Porter & Johnson 2000). Phlox has been and continues to be an important system for plant evolutionary studies.…”

Section: Received 12 April 2007; Revision Accepted 4 June 2007mentioning

confidence: 99%

Development, characterization and transferability of microsatellite markers for the plant genus Phlox (Polemoniaceae)

Fehlberg

Ford

Ungerer

et al. 2008

Molecular Ecology Resources

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In order to study diversification and microevolution in Phlox, we developed nine polymorphic microsatellite loci. In 20 individuals of Phlox pilosa from a single population, the average number of alleles per locus was 10.0 ± 5.1, and average observed and expected heterozygosities were 0.611 ± 0.234 and 0.769 ± 0.170, respectively. Most of these markers amplified successfully in 11 additional species of Phlox, representing a broad diversity of the genus, and some also amplified in more distantly related members of the Polemoniaceae. These microsatellite markers will be valuable for investigation of evolutionary processes in this important study system.

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Microsteris, Phlox, and an Intermediate

Cited by 7 publications

References 0 publications

A chloroplast DNA phylogeny of easternPhlox(Polemoniaceae): implications of congruence and incongruence with the ITS phylogeny

A chloroplast DNA phylogeny of easternPhlox(Polemoniaceae): implications of congruence and incongruence with the ITS phylogeny

Mismatch between pollen and pistil size causes asymmetric mechanical reproductive isolation acrossPhloxspecies

Development, characterization and transferability of microsatellite markers for the plant genus Phlox (Polemoniaceae)

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