Characteristics of floral nectaries and nectar in two species of Crataegus (Rosaceae)

Weryszko-Chmielewska, Elżbieta; Masierowska, Marzena; Konarska, Agata

doi:10.1007/s00606-002-0283-0

Cited by 18 publications

(11 citation statements)

References 5 publications

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“…The presence of plastids containing starch grains suggests intensive synthesis of sugars which are accumulated in the cells of the nectariferous layer and then used for nectar production. Such correlations in nectariferous tissue cells are also reported by other authors (Durkee et al 1981;Belmonte et al 1994;Nepi et al 1996;Weryszko-Chmielewska et al 2003;Paiva and Machado 2008). The remaining cells of the dogwood gland, exhibiting symptoms of destruction, were characterized by a structure similar to that observed in cells of the nectaries in other plants after several days from the end of the nectar secretion stage (Zer and Fahn 1992;Nepi et al 1996;O'Brien et al 1996).…”

Section: Discussionsupporting

confidence: 69%

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Flower nectary structure in Cornus alba L.

Konarska

2010

Plant Syst Evol

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The structure of the floral nectaries of Cornus alba was studied using light microscopy as well as scanning and transmission electron microscopy. It was found that the nectary gland of white dogwood had the shape of a fleshy ring surrounding the base of the style of the inferior ovary. Nectar secretion occurs through slightly depressed stomata, evenly distributed in the epidermis of the nectary. The nectariferous tissue is composed of over a dozen layers of heterogeneously structured cells. Between groups of cells with a typical structure, characteristic for the secretory tissue, cells occur with degenerated content and a high degree of vacuolization. In the area of the nectary gland cells, no vascular tissue elements were observed. The nectary was irrigated by the vasculature of the flower receptacle.

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Section: Discussionsupporting

confidence: 69%

“…Nectar secretion through nectarostomata, as observed in white dogwood, is the most frequently described mode of nectar secretion in many plant species (e.g., Teuber et al 1980;Durkee 1982;Sammataro et al 1985;Davis and Gunning 1992;Zer and Fahn 1992;Weryszko-Chmielewska et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Flower nectary structure in Cornus alba L.

Konarska

2010

Plant Syst Evol

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“…The structure of nectaries of elecampane corresponds to the general structure of floral nectaries (a single-layered epidermis, several layers of glandular cells) in other plants (Figueiredo and Pais 1992;Weryszko-Chmielewska 2000;Weryszko-Chmielewska et al 2003). The differences relate to the size and shape of the cells, the compactness of their arrangement, the number of layers of secretory cells, their ultrastructure and the venation of the nectary gland.…”

Section: Discussionmentioning

confidence: 98%

“…Descriptions in literature show that nectar can be secreted outside through the walls of the secretory cells (Rachmilevitz and Fahn 1973;Pais and Figueiredo 1994), of trichomes (Sawidis et al 1989;Sawidis 1998), or it can be released through the modified stomata (Nepi et al 1996;Weryszko-Chmielewska et al 2003;Weryszko-Chmielewska et al 2004;Davis et al 2005). In the nectaries of elecampane, nectar was secreted through the stomata.…”

Section: Discussionmentioning

confidence: 99%

Anatomy and ultrastructure of floral nectary of lnula helenium L (Asteraceae)

Sulborska¹,

Weryszko-Chmielewska²

2011

Acta Soc Bot Pol

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Floral nectaries of Inula helenium L. only occurred in disc florets and were situated above the inferior ovary. The shape of the investigated glands (five-armed star with rounded tips and deep incisions observed from above) clearly differed from the shape of the nectaries of other Asteraceae, also the height of nectary was much lower (129 µm). The glandular tissue of the nectaries of elecampane was composed of a single-layered epidermis and 5--9 layers of secretory cells. Nectar was released through modified stomata, mainly arranged in the top part of the gland. The secretory cells were characterised by granular cytoplasm and the presence of a large, often lobate, cell nucleus. In the cytosol, numerous amoeboid plastids, mitochondria, Golgi bodies and ribosomes were present. In small vacuoles, myelin-like structures, fibrous material and vesicles with the content of substances which can be secretion, were observed. The plastid stroma showed different electron density and the presence of internal tubules and plastoglobules. Vesicular extensions forming bright zones were visible between the membranes of the nuclear envelope. Adjacent to the plasmalemma, as well as between the plasmalemma and the cell wall, secretory vesicles occurred, indicating the granulocrine mechanism of nectar secretion.

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“…A correlação positiva entre tamanho de nectário, volume de néctar e quantidade de açúcares, sugere que a diferença na secreção de néctar entre as espécies de Vanhouttea e Sinningia pode estar associada ao tamanho das glândulas. Correlações positivas entre o tamanho do nectário e a quantidade de néctar também foi encontrada para alguns gêneros da família Rosaceae (Weryszko-Chmielewska et al 2003), bem como em várias espécies de Lamiaceae (Dafni et al 1988). Entretanto, estudos sobre nectários em outras espécies de Vanhouttea e Sinningia são necessários para confirmar se estas correlações representam um padrão.…”

Section: Discussionunclassified

Espécies de Vanhouttea Lem. e Sinningia Nees (Gesneriaceae) polinizadas por beija-flores: interações relacionadas ao hábitat da planta e ao néctar

Sanmartin-Gajardo¹,

Sazima²

2005

Rev. bras. Bot.

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-(Species of Vanhouttea Lem. and Sinningia Nees (Gesneriaceae) pollinated by hummingbirds: interactions related with plant habitat and nectar). Hummingbird pollination was suggested for Sinningia and Vanhouttea species based on floral features. However, there is still a lack of information about pollination biology. Here we report observations about floral biology and hummingbird-pollination of three Vanhouttea and three Sinningia species. The flowers are tubular, red and scentless. The pairwise comparison of corolla size results in two groups formed by: V. hilariana, V. brueggeri and S. gigantifolia which have bigger corollas than those of V. calcarata, S. cochlearis, and S. tuberosa. The nectar volume secreted during 24 hours by Vanhouttea species (21.8 ± 13.2 µL) was higher than that of Sinningia species (6.3 ± 5.7 µL). As well, the sugar amount produced by Vanhouttea species (6.1 ± 3.9 mg) was higher than that produced by Sinningia species (1.8 ± 1.6 mg). These differences on nectar production may be correlated with the distinct size of nectar glands in both genera. The hummingbirds Clytolaema rubricauda, Leucochloris albicollis, Stephanoxis lalandi (Trochilinae), Phaethornis eurynome and P. pretrei (Phaethornithinae) were the main pollinators of Vanhouttea and Sinningia species. The group of hummingbird pollinators (Trochilinae or Phaethornithinae) seems to be determined by the habitat of each plant species, while the frequency of visits seems to be mainly determined by nectar features.Key words -frequency of visits, Gesneriaceae, hummingbirds, nectar, Sinningieae RESUMO -(Espécies de VanhoutteaLem. e Sinningia Nees (Gesneriaceae) polinizadas por beija-flores: interações relacionadas ao hábitat da planta e ao néctar). Com base nas características florais tem sido inferida a polinização por beija-flores na maioria das espécies de Sinningia e Vanhouttea, entretanto, informações detalhadas sobre a biologia da polinização são restritas a poucas espécies. Neste estudo são apresentadas as observações sobre a biologia da polinização e as espécies de beija-flores polinizadores, relacionando as características do néctar com o comportamento desses beija-flores em três espécies de Vanhouttea e três de Sinningia. As flores são tubulosas, avermelhadas e inodoras. Em relação ao tamanho da corola estas espécies formam dois grupos morfológicos, sendo as corolas em V. hilariana, V. brueggeri e S. gigantifolia significativamente maiores que em V. calcarata, S. cochlearis e S. tuberosa. O volume de néctar secretado durante 24 horas pelas espécies de Vanhouttea (21,8 ± 13,2 µL) é maior que nas espécies de Sinningia (6,3 ± 5,7 µL). Assim também, a quantidade de açúcares produzida pelas espécies de Vanhouttea é mais alta (6,1 ± 3,9 mg) e difere significativamente das espécies de Sinningia (1,8 ± 1,6 mg). Estas diferenças nas características do néctar podem estar relacionadas com a variação do tamanho das glândulas nectaríferas entre os dois gêneros. Cinco espécies de beija-flores, Leucochloris albicollis, Stephanoxis la...

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Characteristics of floral nectaries and nectar in two species of Crataegus (Rosaceae)

Cited by 18 publications

References 5 publications

Flower nectary structure in Cornus alba L.

Flower nectary structure in Cornus alba L.

Anatomy and ultrastructure of floral nectary of lnula helenium L (Asteraceae)

Espécies de Vanhouttea Lem. e Sinningia Nees (Gesneriaceae) polinizadas por beija-flores: interações relacionadas ao hábitat da planta e ao néctar

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