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ECOLOGICAL ADAPTATIONS of the FLORAL STRUCTURES of Galanthus Nivalis L

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ECOLOGICAL ADAPTATIONS of the FLORAL STRUCTURES of Galanthus Nivalis L ACTA AGROBOTANICA Vol. 63 (2): 41–49 2010 ECOLOGICAL ADAPTATIONS OF THE FLORAL STRUCTURES OF Galanthus nivalis L. Elżbieta Weryszko-Chmielewska, Mirosława Chwil Department of Botany, University of Life Sciences, Akademicka 15, 20-950 Lublin, Poland e-mail: [email protected] Received: 15.07.2010 Abstract drop is found in the south, in Greater Poland (Wielko- The structure of the flowers of Galanthus nivalis shows polska), and in the Lublin region where the northern adaptations to early spring flowering conditions as well as ad- boundary of its range runs (Z a j ą c and Z a j ą c, aptations to entomogamy. The tepals produce colour marks and 2001; Witkowska-Ż u k , 2008). It was cultivated odorous substances. The aim of the present study was to deter- as an ornamental plant already in mediaeval gardens mine the micromorphology and anatomy of tepals, in particular (Maurizio and Grafl, 1969). In Poland this spe- in the regions comprising colour marks which, in accordance cies is strictly protected (P i ę koś -Mirkowa and with the literature data, emit essential oils. Mirek, 2006). Examination was performed using light, fluorescence, Galanthus nivalis L. flowers from February and scanning electron microscopy. Large protrusions, corre- to April (R utkowski, 2004). In the last two dec- sponding to the location of the green stripes, were found to oc- ades of the 20th century, the beginning of flowering of cur on the adaxial surface of the inner tepals. The epidermal cells in this part of the tepals produce a cuticle with characteris- this species was observed in different European coun- tic ornamentation as well as numerous stomata with well-devel- tries a dozen or so days earlier than in the previous oped outer cuticular ledges. The wide opening of many stomata years of the last century (M aak and Storch, 1998; is evidence of high activity in this area. The fluorescence micro- Roetzer et al. 2000), while forecasts for the year scopy images confirm the high activity of the epidermis (scent 2035 predict further acceleration of flowering by 2 emission), on both sides of the tepals, as well as of the chlo- weeks (Maak and S t orch, 1998). roplast-containing mesophyll. In the abaxial epidermis, there The perianth consists of white tepals, arranged were observed different-sized papillae that also participated in in groups of 3 in two whorls. The outer tepals are essential oil secretion. much longer (25 mm) than the inner ones (11 mm), The polarization of the epidermal cell protoplasts, large which are distinguished by characteristic green marks cell nuclei, and the presence of large vacuoles with heteroge- neous contents in the peripheral part of the cells correspond to on their abaxial surface. On the other hand, in the the structural features of the tissues emitting odorous compo- adaxial part of the upper tepals there are green stripes unds in flowers – osmophores. In freshly opened flowers, the that are nectar guides for insects. K ugler (1970) re- mesophyll of the central part of the perianth segments was com- ports that these stripes are also associated with scent posed of several cell layers, whereas in older flowers large air emission. Other research shows that an efficient pho- ducts formed, which are adaptations to environmental thermal tosynthesis process occurs in the cells of the green conditions. area of the tepals, which provides photoassimilates to flowers and developing seeds (A schan and Key words: Galanthus nivalis, tepals, micromorphology, Pfanz, 2006). anatomy, osmophores The flowers of G. nivalis provide to insects pre- cious early spring forage. In addition to nectar, they offer valuable pollen to insects. This pollen is a rich INTRODUCTION source of group B vitamins (K och and Schwarz, Snowdrop (Galanthus nivalis L., Amarylli- 1956). Bees are the primary pollinators of these flow- daceae) grows wildly in central and southern Europe, ers (Kugler, 1970). They form glistening orange Asia Minor, as well as in the Caucasus (P i ę koś - pollen loads from the collected pollen of G. nivalis Mirkowa and Mirek, 2007). In Poland snow- (Maurizio and Grafl, 1969). 42 Elżbieta Weryszko-Chmielewska, Mirosława Chwil Flower development in G. nivalis starts already ner tepals visible to pollinators (Fig. 1A, E). In the inves- in autumn, while its continuation and flower pollina- tigated flowers, the green mark surface area was 3.5 mm². tion take place in early spring. Morphologically devel- The green stripes, located between the vascular bundles, oped ovules with embryo sacs were found in flower are found on the adaxial surface of the inner whorl of te- buds in September (A khalkatsi and Gvaladze, pals (Fig. 1B, D). The stamens, situated close to the style, 1992; Chudzik et al. 2002). initially dehisce at the apex (Fig. 1C), and then towards The special anatomical features of the leaves their bases along a longitudinal slit (Fig. 1C). In the up- and tepals of G. nivalis should be considered to be its per part of the ovary, between the bases of the filaments ecological adaptations. Š č epankova and Hudak and the style, there is located a discoid nectary that forms (2004) showed that lysigenous ducts occurred in the a bright layer, contrasting with the green ovary when leaves, likewise in the central part of the perianth seg- viewed in longitudinal section (Fig. 1C). ments. The presence of lipid compounds was found in the mesophyll cell chloroplasts, but no starch grains Tepal micromorphology (SEM) were shown. The adaxial tepal surface shows large pro- The aim of the present study was to examine the trusions that correspond to the location of the green micromorphology and anatomy of the tepals of Galan- stripes. The average tepal thickness in the places of thus nivalis, with special attention to the chloroplast- these protuberances was 480 μm, whereas in the de- containing regions participating in scent emission. pressions 330 μm. Numerous stomata (64 per 1 mm²) are found on the convex surfaces of the upper half of the tepals (Fig. 2A – E). When viewed by SEM, the MATERIALS AND METHODS epidermal cells in these areas of the perianth segments most frequently have a quadrangular contour, they are The study of the flowers of Galanthus nivalis L. equal dimensional and arranged in rows. Their outer was conducted in the period 2009 – 2010. The plants walls are convex. were obtained from the Botanical Garden of the Maria The Amaryllis-type stomata, with an average Curie-Skłodowska University in Lublin. Flowers were length of 30 μm and an average width of 26 μm, are sampled at the initial stage of flowering. Observations partially shielded by the epidermal cells lying nearby. were performed on the tissues of the upper whorl of Each stoma is surrounded by 5 – 6 epidermal cells. tepals on which colour attractants occurred. Well-developed outer cuticular ledges are wide open Hand-cut cross sections of tepals were used in many stomata, forming a large outer vestibule (Fig. for initial light microscopy (LM) examination; they 2D, E). The wide opening of the guard cells may indi- were treated with IKI solution or Sudan III to detect cate high physiological activity of these regions, which the presence of starch and lipids. The analysis of the is probably associated with the emission of odorous plant material was also carried out based on permanent compounds. The surface of the cuticle of the adaxial slides made from semi-thin sections (0.7 – 1 μm) stained epidermis cells is marked by characteristic ornamenta- with 1% toluidine blue 0 with 1% azur II, prepared in tion formed from undulating and tightly packed striae accordance with the method described by C hwil (Fig. 2D, E). But the epidermal cells located in the de- (2009). The PAS reaction was performed to identify pressions of the tepals are more elongated and covered starch. by a cuticle with a less complicated pattern (Fig. 2F). A Nikon Eclipse 90 i fluorescence microscope The abaxial surface of the upper parts of the te- was used to locate the physiologically active tissues pals is characterized by the presence of conical papillae of the osmophore. The freshly-cut sections were ob- with a height of 36 – 60 μm, on average 49 μm (Fig. 3A served using a TRITC filter set with a light wavelength – D). Their diameter at the base is approx. 30 μm. The of EX 540/25 and BA 605/55, obtaining red autofluo- papillae occur at high density (28 per 1 mm²). The cell rescence. The fixed sections were examined after the wall surface is covered with a layer of cuticle show- application of auramine. ing regular striations. Stomata are located between the The micromorphology of the tepal surface was papillae in some places of the epidermis. observed in a Tesla BS – 340 scanning electron micro- scope (SEM), having prepared the microscopic slides Tepal anatomy (LM) according to the method given by C h wil (2009). The adaxial epidermis is made up of fine cells (Fig. 4A, H), 24 – 28 μm in height. The thickness of the outer wall in these cells reaches 2.5 μm. The epi- RESULTS dermal cell protoplast is polarized; it has a large-sized Floral morphology nucleus situated by the inner wall and a large vacuole The outer tepals of Galanthus nivalis open during with heterogeneous contents located closer to the outer sunny weather, making the green mark at the tip of the in- wall (Figs 4I; 5B, D). Ecological adaptations of the floral structures of Galanthus nivalis L. 43 Fig. 1. Flowers of Galanthus nivalis A – Part of a flowering plant, x 0.8 B – A flower after removal of several tepals, x 6 C – The longitudinal portion of a flower with a visible nectary (arrow) at the base of the filaments, x 12 D – The apical part of the stamens in a flower after pollen release, x 7 B, E – Colour marks on the adaxial (B) and abaxial (E) surface of the inner tepals, E – x 8 44 Elżbieta Weryszko-Chmielewska, Mirosława Chwil Fig.
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