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Ecological Aspects of the Floral Structure and Flowering in Pulsatilla

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Ecological Aspects of the Floral Structure and Flowering in Pulsatilla Acta Agrobotanica DOI: 10.5586/aa.1715 ORIGINAL RESEARCH PAPER Publication history Received: 2017-02-16 Accepted: 2017-07-11 Ecological aspects of the foral structure and Published: 2017-09-20 fowering in Pulsatilla species Handling editor Barbara Łotocka, Faculty of Agriculture and Biology, Warsaw University of Life Sciences – Elżbieta Weryszko-Chmielewska1*, Aneta Sulborska1, Beata SGGW, Poland Żuraw1, Renata Chyżewska2, Thomas Sawidis3 Authors’ contributions 1 Department of Botany, University of Life Sciences in Lublin, Akademicka 15, 20-950 Lublin, EWC: the proposal of the Poland study; EWC, AS, BŻ, RC: data 2 Department of Ornamental Plants and Landscape Architecture, University of Life Sciences in interpretation; EWC, AS: Lublin, Głęboka 28, 20-612 Lublin, Poland microscopical analysis; AS, RC: 3 Department of Botany, Aristotle University of Thessaloniki, 54006 Thessaloniki, Macedonia, photography; EWC, AS, BŻ, TS: Greece manuscript preparation * Corresponding author. Email: [email protected] Funding This research was supported by the Polish Ministry of Science Abstract and Higher Education as part of the statutory activities of In terms of fowering ecology, Pulsatilla fowers are classifed as “pollen fowers” the Department of Botany, producing inconsiderable amounts of nectar. Te aim of this study was to assess the University of Life Sciences in length of the fowering period in Pulsatilla slavica and P. vulgaris and to investigate Lublin. the structure of the epidermis of the perianth and generative elements of their Competing interests fowers. Special focus was placed on the structure of hairs and the distribution of EWC is an honorary Editor-in- stomata. Te weight of nectar released by the fowers of the two Pulsatilla species Chief of the Acta Agrobotanica; and the content of sugars in the nectar was also evaluated. In SE Poland, both species AS is an editorial secretary fowered for similar periods between the second half of April and the frst half of of Acta Agrobotanica; TS is a member of the Editorial Council May. Te fower life-span of both was determined to be 9–14 days. Te lower part of of the Acta Agrobotanica; other each sepal was observed to be covered by long hairs having cellulose-pectin cell walls authors: no competing interests of varying thickness. Hairs present on the pistil style are thinner; they may provide some protection against cold and can play a role of a secondary pollen presenter Copyright notice for insects. Te bowl-shaped structure of the perianth and the nature of the adaxial © The Author(s) 2017. This is an Open Access article distributed surface of the sepal epidermis may facilitate refection of sunlight into the inner parts under the terms of the Creative of the fower, which may contribute to an elevation of the intrafower temperature. Commons Attribution License, Tis is particularly important for the functionality of the ovary. Te surface of the which permits redistribution, hairs was seen to be covered by a cuticle ensuring water impermeability. Flowers are commercial and non- commercial, provided that the visited by honeybees, bumblebees, butterfies, and ants, for which nectar and pollen article is properly cited. are the main attractants. Ants, which are regarded as illegitimate fower visitors, were found to cause damage to the androecium. Te number of fruits produced in the Citation fowers of both Pulsatilla species was lower than 50% of the number of pistils. Weryszko-Chmielewska E, Sulborska A, Żuraw B, Chyżewska R, Sawidis T. Keywords Ecological aspects of the foral pasque fower; structure; fowers; hairs; stomata; attractiveness to insects; nectar; structure and fowering in pollen Pulsatilla species. Acta Agrobot. 2017;70(3):1715. https://doi. org/10.5586/aa.1715 Introduction Digital signature This PDF has been certifed using digital signature with a trusted timestamp to assure its origin and integrity. A verifcation Te genus Pulsatilla (Ranunculaceae) comprises more than 30 species growing in the trust dialog appears on the PDF document Northern Hemisphere, primarily in Europe and temperate Asia, with an eastern oc- when it is opened in a compatible PDF reader. Certifcate properties provide currence range in Japan. Two species occur in North America [1,2]. Species growing in further details such as certifcation time and a signing reason in case any alterations Europe are perennials, characteristic for members of xerothermic communities. Since made to the fnal content. If the certifcate they have large, decorative fowers, many species are cultivated as early-spring ornamental is missing or invalid it is recommended to verify the article on the journal website. plants with P. vulgaris subsp. grandis as one of the most attractive [2]. Diferent cultivars of this species have fowers varying in color from dark purple through blue-violet and red to white [3]. In Poland, there are six native Pulsatilla species growing in diferent habitats: P. alb a , P. patens, P. pratensis, P. slavica, P. vernalis, and P. vulgaris. All these species are strictly protected but P. vulgaris probably no longer grows in natural sites in Published by Polish Botanical Society 1 of 16 Weryszko-Chmielewska et al. / Floral structure and fowering of Pulsatilla Poland [4,5]. Recent investigations of the ecological structure of P. patens populations in northeast Poland (Białowieża Primeval Forest) have demonstrated low numbers of individuals of this species [6]. From the point of view of fowering ecology, there are many important traits in the fower structure and function determining reproductive success. Tese include the size, shape, symmetry, color, odor, and texture of the perianth, the presence of color indicators, exposure of stamens and pistils, and foral rewards for pollinators, i.e., pollen, nectar, heat, resin, and oil [7–10]. Te large Pulsatilla fowers with variously colored perianths formed by petaloid sepals are attractive to many insect groups such as small bees and beetles [11], bumblebees [12–15], solitary bees [15], honeybees [8,16], and butterfies [7,17]. Pollen is the main foral reward ofered to pollinators [7,10,18]. It has been shown that in P .vulgaris and P. r ubra the stamens and pollen emit a scent and the chemical composition of these anther volatiles has been determined [19]. Some species of Pulsatilla develop staminodial nectaries and produce nectar [7,14,17,18]. In several species of this genus, for example in P. alpina, no foral nectaries have been found [19,20]. Pulsatilla fowers have been classifed as either bell-shaped [7] or bowl- shaped [19] on the basis of the perianth shape, which determines the accessibility of nectar and pollen to pollinators, Studies conducted by several researchers have indicated that for some Pulsatilla spe- cies the temperature in the interior of fowers is higher than the ambient temperature. Knutson [11] found that the intrafower temperature in P. patens was 8.9–10.0°C higher than that of the surrounding environment in bright sunshine. Luzar and Gottsberger [21] showed that in P. alpina the temperature exceeded ambient values by a maximum of 6.2°C. Tis species was found to be the most efective in terms of foral heating among fve alpine species studied. It is assumed that the increased intrafower temperature in plants fowering in early spring accelerates the development of pistils and pollen tubes as well as ofers an additional reward for pollinators in the form of intraforal warming and heated nectar [9]. Te aim of the present study was to compare the length of the fowering period in two species from the genus Pulsatilla and to document ecologically-signifcant features in the structure of the perianth, gynoecium, and androecium with special emphasis on the structure of hairs and the distribution of stomata. An assessment of the attractiveness of Pulsatilla fowers to insects was also performed, complemented by an evaluation of nectar production in the two species. Material and methods Te Pulsatilla species selected for study were P. vulgaris Mill., P. slavica G. Reuss., and P. pratensis (L.) Mill. growing in the collection of the Botanical Garden of Maria Curie- Skłodowska University in Lublin, and three cultivars of P. vulgaris Mill., ‘Roede Klokke’, ‘Blue Shadow’, and ‘Alba’ collected from a private garden in Świdnik near Lublin. Nectar production by fowers of P. vulgaris and P. slavica was investigated using the method developed by Jabłoński [22]. Te fowering dates and fowering duration in 2009–2011 were recorded in both species and in the three ornamental cultivars of P. vulgaris. Te life-span of a single fower was recorded and the percentage of fruits set calculated. Sepal structure, generative elements, and staminodia were investigated using both light and scanning electron microscopy. Light microscopy (LM) and histochemical tests Te staminodia, stamens, and pistils were counted (n = 30 for each structure) under a stereoscopic microscope STM 800 (Microlab). Te lengths of stamens, pistils, stamino- dia, and fruits (n = 30 for each structure) were measured. Glycerine preparations were made from fresh sepals (marginal portions of the central area of the sepal), stamens, pistils, staminodia, and pollen grains. Te lengths of the hairs located on the surface of the sepals and pistils and the thickness of the hair cell walls were measured (n = 30). Additionally, the polar (P) and equatorial (E) axes of the pollen grains (n = 50) were © The Author(s) 2017 Published by Polish Botanical Society Acta Agrobot 70(3):1715 2 of 16 Weryszko-Chmielewska
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