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1

Nectar production of selected winter rape cultivars

100%
Kamler F., Jas S.
Journal of Apicultural Science
|
2003
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tom 47
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nr 2
2
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Nectar production and spectrum of insect visitors in six varieties of highbush blueberry (Vaccinium corymbosum L.) in SE Poland

75%
Bozek M.
Acta Agrobotanica
|
2021
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tom 74
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nr 1
3

The results of preliminary studies on flowering and nectar production in some representatives of the genus Sedum L.

75%
Zuraw B.
Pszczelnicze Zeszyty Naukowe
|
2000
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tom 44
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nr 2
4
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Flowering biology and structure of floral nectaries in Galanthus nivalis L.

63%
Weryszko-Chmielewska E., Chwil M.
Acta Societatis Botanicorum Poloniae
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2016
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tom 85
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nr 1
In Poland Galanthus nivalis L. is partially protected. The flowers of this species are one of the first sources of nectar and pollen for insects from February to April. The aim of this study was to present the flowering biology as well as the topography, anatomical, and ultrastructural features of the floral nectary. The flower lifespan, the breeding system, and the mass of pollen and nectar produced by the flowers were determined. Examination of the nectary structure was performed using light, fluorescence, scanning and transmission electron microscopy. The flower of G. nivalis lives for about 30 days. The stamens and pistils mature simultaneously and during this time nectar is secreted. The anthers of one flower produced the large amount of pollen (4 mg). The breeding system of G. nivalis was found to be characterized by partial self-compatibility, outcrossing, and xenogamy. The nectary is located at the top of the inferior ovary. The nectary epidermal cells are characterized by striated cuticular ornamentation. Initially, the secreted nectar formed vesicle-like protuberances under the cuticle. The epidermal and parenchymal cells contain numerous plastids, mitochondria, dictyosomes, ER cisterns, and vesicles fused with the plasmalemma, which indicates granulocrine nectar secretion.
5
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Flowering dynamics, nectar secretion and insect visitation of Phacelia campanularia A. Gray

63%
Wroblewska A.
Acta Agrobotanica
|
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%.
6

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

63%
Jablonski B., Koltowski Z.
Journal of Apicultural Science
|
2001
|
tom 45
7
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The structure of some floral elements and the nectar production rate of Polemonium caeruleum L.

51%
Chwil M.
Acta Agrobotanica
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2010
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tom 63
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nr 2
The present study, carried out in the period 2008 – 2009, covered some morphological and anatomical features of the flowers of Polemonium caeruleum L. and their nectar production rate in the climatic conditions of the Lublin region. Observations were made with stereoscopic, light and scanning electron microscopy. Nectar production in the flowers was determined using the pipette method. The flowers of Polemonium caeruleum develop a calyx covered by an epidermis with numerous non-glandular and glandular trichomes. The secretory trichomes are composed of a several-celled stalk and a four-celled head. At the boundary of the corolla tube and the lobes, there is white colouration with violet nectar guides. The epidermis in this region produces several-celled living trichomes that close the entry into the corolla tube, thereby protecting the nectar accumulated in it. These hairs are at the same time glistening colour attractants for insects. The tripartite stigma of the pistil is covered, from the adaxial side, by unicellular papillae with striated cuticular ornamentation, growing at high density. Around the ovary there is located a nectariferous disc, in the form of a free projection, which secrets nectar with sugar concentration of 29 – 52% and sugar weight ranging 1.1 – 1.8 mg/flower.
8
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Nectar production in several Campanula species (Campanulaceae)

51%
Strzalkowska-Abramek M., Jachula J., Wrzesien M., Bozek M., Dabrowska A., Denisow B.
Acta Scientiarum Polonorum. Hortorum Cultus
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2018
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tom 17
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nr 3
The flowering, nectar production and sugar content were examined in 2012–2013 seasons for three Campanula species (C. persicifolia L., C. glomerata L., C. trachelium L.). The flowers of all studied Campanula spp. are distinctly protandrous; most of them opened between 10.00 and 14.00; only the flowers of C. glomerata continued the opening process until 16.00 (GMT + 2 h). The flower life-span differed between species and was the longest for C. persicifolia – ca. 5.5 days and lasted 3.0–3.5 days in C. glomerata and C. trachelium. The duration of the male phase was 2–3 fold shorter (C. persicifolia and C. glomerata) than the female phase or was equal (C. trachelium). Irrespective of the year of study and the species, the female-biased nectar production pattern was evidenced. The amount of nectar accumulated at the female phase reached 70–87% of the maximum nectar produced by a flower. The total sugar yield (0.4– 12.2 g/10 m2) established for the studied species is low compared to other herbaceous meadow species. However, due to diverse insect visitors groups, the Campanula flowers can be recommended to support pollinators in home gardens or on idle lands.
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