| 1. |
- Andersson, Stefan
(författare)
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Ecotypic divergence in Crepis tectorum (Asteraceae): inferring trait lability and correlational constraints from hormonally manipulated phenotypes
- 2019
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Ingår i: Nordic Journal of Botany. - : Wiley. - 1756-1051 .- 0107-055X. ; 37:3
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Tidskriftsartikel (refereegranskat)abstract
- Despite long‐standing interest in the evolutionary role of plant hormones, relatively few studies have used hormonally manipulated phenotypes to address questions about phenotypic evolution in plants. In the present investigation, I subjected plants of Crepis tectorum subsp. pumila to simple gibberellin (GA) treatments under both field and greenhouse conditions to assess developmental lability and correlational constraints of phenotypic traits that distinguish this dwarf ecotype from conspecific populations of the much taller weed ecotype (subsp. tectorum). The hormonally manipulated plants largely phenocopied the weed ecotype in leaf shape, plant stature and branching habit, indicative of both high lability and tight integration of traits reflecting gross morphology. Floral size traits sometimes declined after GA application, especially under field conditions. The latter result conflicts with the positive correlations between floral and vegetative size traits seen in previous comparative analyses and point to a tradeoff that could act as a constraint on ecotype divergence. The response to GA was consistent in direction for most traits, as opposed to the magnitude of response, which varied depending on the trait, the population, the growing environment and the timing and level of hormone application. Taken together, the results highlight the potential for simple hormonal changes to cause large, plastic shifts in phenotype, but also illustrate the constrained nature of such influences.
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| 2. |
- Bergström, Gunnar, 1934, et al.
(författare)
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Floral scent chemistry within the genus Linnaea (Caprifoliaceae)
- 2018
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 36:3
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Tidskriftsartikel (refereegranskat)abstract
- ‘Beauty bush’ and ‘twin flower’ are common names attributed to two well-recognizable species belonging to the genus Linnaea (16 spp.) – L. amabilis and L. borealis – long admired by botanists and gardeners for their perfumed paired bell-shaped flowers. In the present study, we investigated their floral scent compositions through gas chromatography – mass spectrometry (GC-MS) analysis of dynamic headspace samples. Because the flowers of L. borealis in wild populations are fragrant both during the day and in the evening, circadian variation of scent emission was also assessed for this species. In total, 26 chemical compounds comprise the floral scent bouquets of L. amabilis and L. borealis, identified as monoterpenes (14), benzenoids and phenylpropanoids (5), aliphatics (3), sesquiterpenes (3) and irregular terpenes (1). Whereas monoterpenes, notably (-)-α- and β-pinene, dominated the scent of L. amabilis (over 82% relative abundance), benzene derivates: 1,4 dimethoxybenzene, anisaldehyde, 2-phenylethanol, benzaldehyde and nicotinaldehyde were exclusive to analysed headspace samples of L. borealis, accounting for 52% to 100% of their relative compositions, in three Swedish populations. A southwestern Finnish population was characterized by the four first mentioned benzenoid compounds and large amounts of (-)-α- and β-pinenes plus two aliphatic substances. The scent compounds identified for both species are ubiquitous and may serve as generalist attractants/stimulants for a broad assortment of anthophilous insects. The basic work on the flower scent of L. amabilis and L. borealis should inspire studies of their pollination biology, primarily the behaviour-guiding roles of the characteristic emitted volatiles. © 2017 The Authors
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| 3. |
- Ekman, Stefan
(författare)
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Fellhaneropsis almquistiorum sp nov from Europe (Pilocarpaceae, lichenized Ascomycota)
- 2015
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 33:6, s. 641-645
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Tidskriftsartikel (refereegranskat)abstract
- Fellhaneropsis almquistiorum S. Ekman, a lichenized ascomycete in the family Pilocarpaceae (Lecanorales, Lecanoromycetes) is described as new to science. It is characterized by the thin and filmy crustose thallus, small photobiont, apothecia with a yellowish to black disk and well developed black margin that becomes excluded with age, dark green and brown pigmentation in the proper exciple and hypothecium, a hymenium without pigment or with some green and brown pigment, more or less fusiform and 3-septate ascospores, abundant black pycnidia, and long and filiform conidia. The species is currently known from central Sweden and central Germany, where it inhabits shaded and acid to neutral rocks with few competing lichens. Historical records were all misidentified as Bacidia coprodes or any of its synonyms or misapplied names. Some specimens of F. almquistiorum contain a previously unrecorded pigment, tentatively named here Almquistiorum-yellow. This pigment is intensely golden yellow in water, does not react with KOH and fades with the addition of HCl or HNO3. A key to all known, pycnidiate members of Fellhaneropsis is provided.
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| 4. |
- Lidén, Magnus, 1951-, et al.
(författare)
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Impatiens pyrorhiza sp. nov. (Balsaminaceae) from east Himalaya
- 2017
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 35:4, s. 411-416
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Tidskriftsartikel (refereegranskat)abstract
- Impatiens pyrorhiza sp. nov. from the Tawang and West Kameng districts in northwest Arunachal Pradesh, India, is described and compared with related species. It is similar to I. gamblei from east Nepal and northwest Darjeeling, but differs in for example: a) rhizome extended, orange, much-branched, b) leaves with numerous teeth, c) petiole base with prominent glands, d) raceme supported by subtending leaf and e) lateral sepals without an apical divergent extended callosity.
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| 5. |
- Milberg, Per, et al.
(författare)
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Annual burning of semi-natural grasslands for conservation favours tall-grown species with high nectar production
- 2018
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Ingår i: Nordic Journal of Botany. - : WILEY. - 0107-055X .- 1756-1051. ; 36:5
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Tidskriftsartikel (refereegranskat)abstract
- Species-rich semi-natural grasslands in Europe are a main target for conservation efforts, and alternative methods to the traditional management of mowing or grazing would be welcome due to the difficulties in maintaining traditional management practices. One such method proposed is burning of grassland vegetation during late winter or spring. To evaluate the effects of annual spring burning vs annual mowing on semi-natural grassland vegetation, we compared the frequency of species in eleven field experiments in southern Sweden after ca 14 years. Out of the 88 species analyzed, five were more frequent in burnt plots compared with mowed plots (Vicia cracca, Cirsium arvense, Urtica dioica, Galium verum, Convallaria majalis). In contrast, 37 species were significantly less frequent in burnt plots compared with mowed ones, those with the largest differences being Ranunculus acris, Briza media, Veronica chamaedrys, Festuca ovina, Plantago lanceolata and Anthoxanthum odoratum. Tall-grown species and those with preferences for N-rich soils increased in frequency under an annual spring-burn regime, compared with annual mowing, as did species producing larger amounts of nectar. Hence, although vegetation composition becomes more trivial with annual spring burns, there might be long-term benefits for nectar-feeding insects.
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| 6. |
- Paukov, Alexander, et al.
(författare)
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Aspicilia goettweigensis (Megasporaceae, lichenized Ascomycetes) – a poorly known and overlooked species in Europe and Russia
- 2017
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 35:5, s. 595-601
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Tidskriftsartikel (refereegranskat)abstract
- Aspicilia goettweigensis is a poorly known species from xerothermic siliceous rocks in Europe. It is considered to be common in the Czech Republic and it is new to Hungary and Russia. The main diagnostic character is formation of cracked, popcorn-like, areoles in the central parts of the thalli. Analysis of nrITS sequences revealed its close relationship to Aspicilia subdepressa and A. volcanica. TLC revealed stictic acid in analysed A. goettweigensis samples. A key to non-lobate Aspicilia with stictic acid known from Europe is provided.
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| 7. |
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| 8. |
- Thulin, Mats, 1948-, et al.
(författare)
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Cucumis omissus sp nov (Cucurbitaceae) from southern Arabia and Ethiopia and its phylogenetic position
- 2018
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 36:10
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Tidskriftsartikel (refereegranskat)abstract
- The new species Cucumis omissus Thulin from Yemen, Oman and Ethiopia is described and illustrated. According to phylogenetic analyses based mainly on nuclear ribosomal ITS sequences and chloroplast trnG sequences, the new species is sister to C. hastatus from Somalia and Ethiopia. A map showing the distributions of both C. omissus and C. hastatus is provided and morphological differences between these two species are highlighted. Cucumis omissus has been confused with C. pustulatus and C. prophetarum in the literature and in herbaria, and morphological differences from these two species are provided as well. Oreosyce africana is nested within Cucumis in this, as well as in several previous studies. We clarify that when O. africana is treated as a Cucumis, its correct name is C. subsericeus.
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| 9. |
- Thulin, Mats, et al.
(författare)
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Mollugo brasiliensis sp nov (Molluginaceae) from eastern Brazil
- 2015
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 33:2, s. 175-177
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Tidskriftsartikel (refereegranskat)abstract
- The new species Mollugo brasiliensis Thulin & Harley, a perennial viscous herb with 6-8 stamens, few-seeded capsules and tuberculate seeds, is described from eastern Brazil. It is compared primarily with the two other native members of Molluginaceae previously known from Brazil, M. verticillata L. and Glischrothamnus ulei Pilger.
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| 10. |
- Thulin, Mats, 1948-, et al.
(författare)
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Mollugo viscosa sp. nov. (Molluginaceae), a segregate of M. brasiliensis from Minas Gerais in eastern Brazil
- 2019
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Ingår i: Nordic Journal of Botany. - : WILEY. - 0107-055X .- 1756-1051. ; 37:7
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Tidskriftsartikel (refereegranskat)abstract
- The new species Mollugo viscosa Thulin & Harley is described from Minas Gerais in eastern Brazil. It was previously part of the recently published M. brasiliensis Thulin & Harley, a species that was found to be non-monophyletic in molecular phylogenetic analyses. Mollugo brasiliensis is here divided into a northern species (M. brasiliensis s.str.) in Bahia and a southern species (M. viscosa sp. nov.) in Minas Gerais. The new species differs from M. brasiliensis in its denser and more viscous indumentum, and in its distinctly smaller seeds with smaller tubercles and a smaller hilar peg, and from its sister species M. ulei by being a perennial herb with bisexual flowers.
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