Wyniki wyszukiwania

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Anatomical traits of nectaries and nectar secretion by the flowers of Cotoneaster lucidus Schlecht. and C. nanshan Mottet.

100%

Weryszko-Chmielewska E., Chwil M., Konarska A.

Journal of Apicultural Science

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2004

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tom 48

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nr 1

2

The structure of nectaries and nectar secretion in common pear [Pyrus communis L.]

100%

Konarska A., Masierowska M., Weryszko-Chmielewska E.

Journal of Apicultural Science

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2005

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tom 49

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nr 1

3

Flowering and melliferous value of three Malva L. species

100%

Wroblewska A.

Pszczelnicze Zeszyty Naukowe

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2000

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tom 44

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nr 2

4

Nectar secretion and honey potential of honey-plants growing under Poland's conditions - Part XIV

100%

Jablonski B., Koltowski Z.

Journal of Apicultural Science

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2004

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tom 48

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nr 1

5

The blooming, nectar secretion and foraging by bees of three species of Agastache

100%

Jablonski B., Koltowski Z.

Pszczelnicze Zeszyty Naukowe

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2000

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tom 44

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nr 2

6

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Flowering, nectar secretion, pollen shed and insect foraging on Aquilegia vulgaris L. (Ranunculaceae)

84%

Denisow B., Anton S.

Acta Agrobotanica

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2012

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tom 65

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nr 1

This study on blooming biology, nectar secretion, pollen production and insect visitation of Aquilegia vulgaris L. was carried out in 2009 and 2011 in Lublin. The peak of flower opening during the day was between 5.00 and 7.00 (GMT +2). The flowers are protandrous with the female phase beginning approx. on the 3rd day of anthesis. The dynamics of nectar secretion and pollen shed from anthers (progressing from the central part of the androecium outwards) support the reproductive system. The amount of nectar accumulated in the spurs increased from the bud stage and was the highest in the phase with approx. ¾ of dehisced anthers, usually on the 3rd day of flower life. Then, towards the end of anthesis, the amount of secreted and accumulated nectar decreased. The number of anthers developed per flower varied from 41 to 61 (mean = 49.1). The mass of pollen per 100 anthers averaged 6.7 mg. Pollen production per flower (mean = 3.28 mg) slightly varied between years and was mainly correlated with the number of developed anthers. Estimated pollen yield was 1.69 g per m2 and sugar yield 1.22 g per m2. Species from the genus Bombus were the main flower visitors, with B. terrestris being the most frequent forager.

7

The location of nectaries and nectar secretion in the flowers of Allium giganteum Regel

84%

Zuraw B., Weryszko-Chmielewska E., Laskowska H., Pogroszewska E.

Acta Agrobotanica

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2010

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tom 63

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nr 2

In the flowers of Allium there are found septal nectaries; in particular species, their outlet can be located in different parts of the ovary. The inflorescences of these plants are a rich source of nectar for insects. The location and structure of septal nectaries in the flowers of Allium giganteum Regel were investigated. Light and scanning electron microscopy was used. The septal nectaries were found to be located in the lower part of the ovary and in the gynophore on which the ovary is borne. Nectar is secreted into the nectary slits from which it flows through the ducts to three openings located in the upper part of the gynophore, from whence it gets outside in the vicinity of the expanded parts of the filaments. Sugar concentration in the nectar of A. giganteum averaged 54.5%, while sugar weight per flower was determined to be 0.36 mg. When converted into sugar weight per inflorescence, numbering more than 2,000 flowers, it was 771.7 mg.

8

The position and structure of the nectary in spring heath (Erica carnea L.) flowers

84%

Weryszko-Chmielewska E., Chwil M., Wrobel M.

Acta Agrobotanica

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2009

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tom 62

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nr 2

Ecological traits of Erica carnea L. flowers and the morphology of floral nectaries were investigated using stereoscopic, light and scanning electron microscopy. The nectary in the flowers of Erica carnea is located in the basal part of the ovary. It represents the gynoecial nectary type. It has the form of a yellow, ribbed ring with eight outgrowths, pointed towards the base, which alternately adjoin the stamen filaments. The height of the nectary is 400 μm and its thickness 200 – 250 μm. The parenchyma of the nectary is composed of 6 – 8 layers. Nectar secretion occurs through anomocytic stomata with a diameter of 17 μm. Guard cells are only found on the outgrowths of the nectary and they are situated most frequently at the level of other epidermal cells. During nectar secretion, a small degree of pore opening was observed. In the flowers of Erica carnea, secondary nectar presentation was found, with the nectar accumulating at the base of the fused corolla.

9

Micromorphology of the floral elements, the structure of the nectary, and the apicultural value of Elaeagnus commutata Bernh. ex Rydb.

84%

Chwil M., Weryszko-Chmielewska E.

Acta Agrobotanica

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2011

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tom 64

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nr 1

The investigations were carried out using light and scanning electron microscopy. The flowers of Elaeagnus commutata grow in clusters of 1-4 in the leaf axils. They are actinomorphic, four-lobed, with a single perianth that is yellow from the adaxial side, while the abaxial side is silvery-white. Peltate hairs of different structure are found on both surfaces of the sepals. The conical epidermal cells of the lobes are covered with a thick striated cuticle. Cylindrical hairs were observed on the edges of the lobes. Peltate hairs also grew on the style. The dish-shaped nectary gland is located at the base of the style. Nectar is secreted through numerous, evenly distributed stomata located above or at the level of other epidermal cells. Different stages of stomatal development are evidence of the asynchronous functioning of the stomata. The nectary consists of small epidermal cells and 5-6 layers of secretory parenchyma. The deeper layers of the gland are composed of larger cells of subglandular parenchyma in which vascular bundles supplying the nectary run. Honey bees were the main pollinators of silverberry. Ten silverberry flowers produced an average of 12 g of nectar with a sugar concentration in the 29.5-34.5% range. The weight of pollen produced by 10 flowers was 3.33 mg.

10

Flowering dynamics, nectar secretion and insect visitation of Phacelia campanularia A. Gray

84%

Wroblewska A.

Acta Agrobotanica

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2010

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tom 63

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nr 1

In the years 2004-2006, flowering dynamics and nectar secretion of Phacelia campanularia A. Gray flowers as well as the insect visitation rate were studied in the climatic conditions of Lublin, Poland. The flowering of phacelia started in the middle of June and lasted for 1.5 up to 2 months. Full bloom occurred between the third and fifth week of the flowering period of this taxon. For the study period, the average weight of nectar produced by 10 flowers was 75.64 mg, weight of sugars 11.31 mg, while their concentration in the nectar was 20.2%. Among the entomofauna foraging on the flowers of phacelia, honey bees were predominant, with their proportion among the pollinators accounting for 84.8%.

11

Nectary structure and nectar secretion of Echium russicum J.F.Gmel. flowers

84%

Chwil M., Weryszko-Chmielewska E.

Acta Agrobotanica

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2007

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tom 60

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nr 1

In this study, the micromorphology of nectaries in Echium russicum J. F. Gmel. flowers was determined by using scanning electron microscopy (SEM) and their anatomy by using light microscopy (LM). The rate of nectar production of flowers and sugar concentration in nectar were investigated. The nectary gland is located below the ovary of the pistil. It is composed of 4 parts corresponding to the parts of the ovary. The widest regions of the nectar-producing tissue are situated by the furrows separating the adjacent parts of the ovary. Nectar is secreted through anomocytic stomata, located only in the lower part of the nectary. The stomata were distributed evenly or they formed clusters of 2-3. The average number of stomata on the surface of the whole nectary was 184. At the nectar secretion stage, open and closed, as well as not fully mature stomata were observed. The orientation of most of the stomata was parallel to the nectary base. The cuticle surface of the cells of the upper and lateral part of the nectary was smooth, whereas in the region producing stomata it showed various folds facilitating the retention of nectar. The flowers produced nectar throughout the flowering period. The weight of nectar secreted throughout the lifetime of ten flowers was, on the average, 20 mg, with the concentration of sugars of 58% and their weight reaching 17 mg.

12

Beekeeping value of recently cultivated winter rapeseed cultivars

84%

Koltowski Z.

Journal of Apicultural Science

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2002

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tom 46

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nr 2

13

Beekeeping value of seed production plantings of perko [Brassica rapa var.oleifera x Brassica chinensis]

84%

Koltowski Z.

Pszczelnicze Zeszyty Naukowe

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2000

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tom 44

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nr 2

14

Nutritive for insects attractants in Asphodelus albus Miller flowers

84%

Weryszko-Chmielewska E., Chwil M.

Acta Agrobotanica

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2006

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tom 59

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nr 1

The studies on Asphodelus albus Miller flowers were conducted in the Botanical Garden of the UMCS in Lublin in the years 2004-2005. The flower nectaries location was determined in a stereoscopic microscope. The nectaring abundance was studied with a pipette method described by Jabłoński and Szklanowska (1979), while pollen efficiency determined after Warakomska's ether method (1972). Pollen viability was computed in a sample of 400 grains after acetocarmine staining. The following measurements of pollen grains were made: the length of polar axis (P), equatorial longitudinal axis (EL) and equatorial transverse axis (ET). In Asphodelus albus flowers, there are three nectary glands located in the ovary septa whose outlets are situated in the upper part of the ovary. The nectar secretion starts in a dehiscing bud and persists until the withering stage of perianth leaves. Considering the size of monocolpate pollen grains of Asphodelus albus, they are ranked among great, whereas their shape assumed flattened and circular at the polar view. In the Poland climatic conditions, a pollen showed high vitality (98%). The Asphodelus albus plants constitute a valuable source of nutrition for the pollinators as a single flower generated on average 4,22 mg sugars and 0,2 mg of pollen grains.

15

Nectar secretion and honey potential of honey-plants growing under Poland's conditions

84%

Jablonski B., Koltowski Z.

Journal of Apicultural Science

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2001

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tom 45

16

Ultrastructure of the nectary spur of Platanthera chlorantha [Custer] Rchb. [Orchidaceae] during successive stages of nectar secretion

84%

Stpiczynska M., Milanesi C., Faleri C., Cresti M.

Acta Biologica Cracoviensia. Series Botanica

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2005

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tom 47

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nr 2

In Platanthera chlorantha, nectar is secreted into the lumen of the nectary spur by numerous unicellular hairs. These hairs arise from epidermal cells lining the spur. The nectary was studied in the presecretory (closed bud, 4 days before anthesis), secretory (day 2 of anthesis) and resorption (days 14-16 of anthesis) stages to compare the ultrastructure of the cells during various stages of nectary activity. Plant tissue was fixed for conventional TEM or prepared by freeze-substitution. Secretory cell ultrastructure was observed to change significantly during the various stages of nectary activity. During the presecretory stage, the cells have a large nucleus, dense, granular cytoplasm with numerous mitochondria and ER, and several small vacuoles. Plastids within secretory epidermal cells or subepidermal parenchyma enclose starch, but starch is absent throughout nectar secretion and resorption. During the secretory stage, plastids with a dense stroma contain tubules enclosing osmiophilic material. Abundant dictyosomes and secretory vesicles occur in the cytoplasm, particularly near the plasmalemma, indicating that granulocrine secretion operates in this species. During the resorption stage, most cells still have dense cytoplasm with numerous mitochondria and ER, but dictyosomes are uncommon. Vesicles are present adjacent to the cell wall; they are similar in size and occur in similar numbers to those seen during the secretory stage. They are probably formed by endocytosis. The ultrastructure of the cells prepared by freeze-substitution compared favorably with that seen in cells subjected to conventional chemical fixation.

17

Nectar secretion and honey potential of honey plants growing under Poland's conditions. Part XIII

84%

Jablonski B., Koltowski Z.

Journal of Apicultural Science

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2002

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tom 46

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nr 1

18

Abundance of nectar secretion and pollen production by Polish hybrid composite cultivars of rapeseed

84%

Koltowski Z.

Journal of Apicultural Science

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2003

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tom 47

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nr 2

19

The blooming and melliferous value of tristilous flowers of Japanese quince [Chaenomeles japonica Lindl.]

84%

Denisow B.

Journal of Apicultural Science

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2002

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tom 46

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nr 2

20

Nectar secretion and honey potential of honey-plants growing under Poland's conditions - Part XV

84%

Jablonski B., Koltowski Z.

Journal of Apicultural Science

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2005

|

tom 49

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nr 1

Ograniczanie wyników

Anatomical traits of nectaries and nectar secretion by the flowers of Cotoneaster lucidus Schlecht. and C. nanshan Mottet.

The structure of nectaries and nectar secretion in common pear [Pyrus communis L.]

Flowering and melliferous value of three Malva L. species

Nectar secretion and honey potential of honey-plants growing under Poland's conditions - Part XIV

The blooming, nectar secretion and foraging by bees of three species of Agastache

Flowering, nectar secretion, pollen shed and insect foraging on Aquilegia vulgaris L. (Ranunculaceae)

The location of nectaries and nectar secretion in the flowers of Allium giganteum Regel

The position and structure of the nectary in spring heath (Erica carnea L.) flowers

Micromorphology of the floral elements, the structure of the nectary, and the apicultural value of Elaeagnus commutata Bernh. ex Rydb.

Flowering dynamics, nectar secretion and insect visitation of Phacelia campanularia A. Gray

Nectary structure and nectar secretion of Echium russicum J.F.Gmel. flowers

Beekeeping value of recently cultivated winter rapeseed cultivars

Beekeeping value of seed production plantings of perko [Brassica rapa var.oleifera x Brassica chinensis]

Nutritive for insects attractants in Asphodelus albus Miller flowers

Nectar secretion and honey potential of honey-plants growing under Poland's conditions

Ultrastructure of the nectary spur of Platanthera chlorantha [Custer] Rchb. [Orchidaceae] during successive stages of nectar secretion

Nectar secretion and honey potential of honey plants growing under Poland's conditions. Part XIII

Abundance of nectar secretion and pollen production by Polish hybrid composite cultivars of rapeseed

The blooming and melliferous value of tristilous flowers of Japanese quince [Chaenomeles japonica Lindl.]

Nectar secretion and honey potential of honey-plants growing under Poland's conditions - Part XV