Flower morphology and pollen germination in the genus Capsella (Brassicaceae)

Neuffer, Barbara; Paetsch, Melanie

doi:10.1016/j.flora.2013.09.007

Cited by 17 publications

(13 citation statements)

References 55 publications

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“…The place of origin of C. thracica would appear to be Bulgaria. We argue that the pollen recipient parent species was C. bursa-pastoris, as indicated by cpDNA sequences, and the pollen donator was C. grandifl ora or its progenitor, indicated by the ITS sequences and the length of the style -only C. grandifl ora and C. thracica have an elongated style (Hurka et al, 2012, Neuffer & Paetsch 2013Neuffer, unpublished data).…”

Section: Molecular Phylogeny Of the Genus Capsellamentioning

confidence: 90%

“…Stigmas were completely covered with pollen grains. To avoid uncontrolled selfpollination in the self-compatible species fl owers were emasculated on the fi rst day of fl ower opening, when anthers are still closed due to protogyny (Hurka et al, 1976, Neuffer & Paetsch, 2013. Development of pollen was measured by revealing the appearance of the pollen tubes within tissues of the pistils through visualization of callose plugs, whose formation serve as a sensitive indicator of relative pollen tube growth rates (Snow & Spira, 1991).…”

Section: Methodsmentioning

confidence: 99%

“…Development of pollen was measured by revealing the appearance of the pollen tubes within tissues of the pistils through visualization of callose plugs, whose formation serve as a sensitive indicator of relative pollen tube growth rates (Snow & Spira, 1991). Germination and further development of pollen was inferred by staining pollen tubes following the method described by Kho and Baer (1968), and Neuffer and Paetsch (2013).…”

Section: Methodsmentioning

confidence: 99%

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2014

Mong. J. Biol. Sci.

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To elucidate the evolutionary history of the genus Capsella, we included the hitherto poorly known species C. orientalis and C. thracica into our studies together with C. grandifl ora, C. rubella, and C. bursa-pastoris. We sequenced the ITS, and four loci of noncoding cpDNA regions (trnL-F, rps16, trnH-psbA, trnQ-rps16). In common garden fi eld experiments C. orientalis turned out as early fl owering with a specifi c leaf type. The crossing ability of the species was tested in pollen germination experiments. Capsella orientalis (self-compatible, SC; 2n = 16) forms a clade (eastern lineage) with C. bursa-pastoris (SC; 2n = 32), which is a sister clade (western lineage) to C. grandifl ora (self-incompatible, SI; 2n = 16) and C. rubella (SC; 2n = 16). Capsella bursa-pastoris is an autopolyploid species of multiple origin, whereas the Bulgarian endemic C. thracica (SC; 2n = 32) is allopolyploid and emerged from interspecifi c hybridisation between C. bursa-pastoris and C. grandifl ora. The common ancestor of the two lineages was diploid and SI, and its distribution ranged from eastern Europe to central Asia, predominantly confi ned to steppe like habitats. Biogeographic dynamics during the Pleistocene caused geographic and genetic subdivisions within the common ancestor giving rise to the two extant lineages. Capsella orientalis is verifi ed at several positions in western Mongolia.

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Section: Molecular Phylogeny Of the Genus Capsellamentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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2014

Mong. J. Biol. Sci.

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“…1). Furthermore, pollen tubes of C. apetala self-pollen grew faster compared with C. apetala crossed with wild-type pollen (spe ×wt, Neuffer & Paetsch, 2013). Field experiments in the Botanical Garden of the University of Osnabrueck revealed that the two types differ in the physiological investments into their respective offspring.…”

Section: Introductionmentioning

confidence: 97%

Physiological and anatomical differentiation of two sympatric weed populations

Neuffer

Schorsch

Hameister

et al. 2020

PeerJ

Self Cite

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In the vineyards of Rhineland-Palatinate (Germany), two different types of Shepherd’s Purse (Capsella bursa-pastoris) coexist: (1) the common type called ‘wild type’, and (2) the decandric type called Capsella apetala or ‘Spe’ with four stamens in place of the four petals. In this study, we compare the anatomical and physiological characters of rosette leaves of the respective types. Progeny of individual plants was cultivated in growth chambers under low- and high-light conditions. Under low-light conditions, the stomata densities of the adaxial and abaxial epidermis did not differ between the two types. When grown under high-light conditions, wild type and Spe, both exhibited increased stomata densities compared to low-light conditions, but Spe to a lesser extent than the wild type. The maximal photosynthetic capacity of Spe was lower in both, low-light and high-light conditions compared to wild-type plants. Under all CO2 concentrations, Spe seemed to be less productive. The less effective CO2 assimilation of the Spe mutant C. apetala was accompanied by later flowering. This fact prolonged the vegetative phase of Spe by about two weeks and was sufficient for the maintenance of both populations stably over years.

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“…The evolutionary transition in flowering plants from outcrossing to selfing has occurred multiple times and is generally associated with a distinctive set of floral characteristics, known as the selfing syndrome (as reviewed by Sicard and Lenhard [ 12 ]). A number of floral changes have been reported to accompany the loss of self-incompatibility, including a change from extrorse to introrse anthers in paired stamens, a decrease in the number of pollen grains per flower and a decrease in the pollen/ovule ratio associated with decreased anther length, a decrease in pistil length due to decreasing style length, and smaller petals [ 12 – 14 ]. These changes give populations capable of selfing an advantage over outcrossers when pollinators are scarce.…”

Section: Introductionmentioning

confidence: 99%

Is floral structure a reliable indicator of breeding system in the Brassicaceae?

et al. 2017

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This study investigated the usefulness of floral characters as a potential indicator of breeding system in the Brassicaceae. Initially, pod set, seed set and pollen tube growth experiments were carried out to confirm the breeding systems of 53 lines representing 25 different cultivated and weedy species from the Brassicaceae. The results of the pod set tests clearly differentiated between self-compatible and self-incompatible species. Floral characters were then evaluated on one or more lines of each of the 25 species. Fourteen floral characters were evaluated including, flower diameter, Cruden’s outcrossing index, timing and direction of dehiscence and pollen-ovule ratio. Significant differences between species were evident in all of the floral characteristics evaluated. Flower diameter was generally larger in self-incompatible species than self-compatible species and pollen/ovule ratio was generally higher in self-incompatible species than self-compatible species. However, none of the floral characteristics was able to clearly differentiate the self-compatible and self-incompatible species and allow prediction of the breeding system with absolute confidence. The floral characteristic which was most effective at differentiating the two groups was anther direction at dehiscence.

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Flower morphology and pollen germination in the genus Capsella (Brassicaceae)

Cited by 17 publications

References 55 publications

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Physiological and anatomical differentiation of two sympatric weed populations

Is floral structure a reliable indicator of breeding system in the Brassicaceae?

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