Results 211 to 220 of about 8,724 (245)
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Nectary Structure, Nectar Secretion Patterns and Nectar Composition in Two Helleborus Species
Plant Biology, 1999Abstract: The morphological and cytological characteristics of nectaries of Helleborus foetidus and H. bocconei during the secretory period are reported. The nectaries are derived from modified petals and secrete nectar continuously for about 20 days; they consist of a single layered epidermis, nectar‐producing parenchyma and photosynthesizing ...
VESPRINI J. L., NEPI M., PACINI E.
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Floral nectar composition ofPeganum harmalaL.
Natural Product Research, 2009Chemical composition of the floral nectar of Peganum harmala, a herbaceous medicinal perennial of the family Zygophyllaceae, was analysed using high-performance liquid chromatography technique. The nectar sugar detection experiments resulted in 33.1, 39.8 and 27.4%, respectively, for fructose, glucose and sucrose, upon which the nectar was classified ...
A, Movafeghi +4 more
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Nectar sugar composition in the subfamily Alloideaec (Aphodelaceae)
Biochemical Systematics and Ecology, 1993Abstract HPLC analyses of nectar samples from 82 species of the genera Aloe, Astroloba, Chortolirion, Gasteria, Haworthia, Kniphofia, Lomatophyllum and Poelnitzia have shown that the sugar compoisition of nectar is remarkably invariable within each of the genera.
Ben-Erik Van Wyk +5 more
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Journal of Economic Entomology, 2000
Floral nectar characteristics of nine inbred lines of onion (Allium cepa L.) were examined to determine their influence on the attractiveness of the onion flowers to honey bees (Apis mellifera L.). Potassium concentrations and sugar concentrations of the nectar did not significantly correlate with the number of bee visits received by an umbel.
E M, Silva, B B, Dean
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Floral nectar characteristics of nine inbred lines of onion (Allium cepa L.) were examined to determine their influence on the attractiveness of the onion flowers to honey bees (Apis mellifera L.). Potassium concentrations and sugar concentrations of the nectar did not significantly correlate with the number of bee visits received by an umbel.
E M, Silva, B B, Dean
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The nectar of Justicia and Columnea: Composition and concentration in a humid tropical climate
Oecologia, 1981Studies in Costa Rica on two ornithophilous flowers, Justicia aurea (Acanthaceae) and Columnea glabra (Gesneriaceae) showed a constancy of nectar solute concentrations that was attributed to microclimatic protection by the tubular corolla and to copious nectar secretion, helped by waterproofing by a lipid film on the nectar surface in Justicia and by ...
Sarah A, Corbet, P G, Willmer
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Onion Hybrid Seed Production: Relation with Nectar Composition and Flower Traits
Journal of Economic Entomology, 2018Onion (Allium cepa L.) is one of the main vegetable crops. Pollinators are required for onion seed production, being honeybees the most used. Around the world, two types of onion varieties are grown: open pollinated (OP) and hybrids. Hybrids offer numerous advantages to growers, but usually have lower seed yields than OP cultivars, which in many cases ...
Soto Vargas, Verónica Carolina +3 more
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Folivory Affects Composition of Nectar, Floral Odor and Modifies Pollinator Behavior
Journal of Chemical Ecology, 2013Herbivory induces changes in plants that influence the associated insect community. The present study addresses the potential trade-off between plant phytochemical responses to insect herbivory and interactions with pollinators. We used a multidisciplinary approach and have combined field and greenhouse experiments to investigate effects of herbivory ...
Bruinsma, M. +6 more
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Canadian Journal of Botany, 1956
Nectar secretion was studied in excised flowers of snapdragon (Antirrhinum majus L.) grown in culture solution during the secretory period. The supply of sugar to the flower was regulated by varying the sugar concentration of the culture medium or the volume of medium entering the flower.
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Nectar secretion was studied in excised flowers of snapdragon (Antirrhinum majus L.) grown in culture solution during the secretory period. The supply of sugar to the flower was regulated by varying the sugar concentration of the culture medium or the volume of medium entering the flower.
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The role of nectar aminoacidic composition in pollinator preference
2014Amino acids are the main nectar components after sugars. In addition to protein amino acids (among which Proline is the main one) non-protein amino acids (eg GABA, β-alanine) are also present and sometimes very abundant, but their contribution to floral attraction to pollinators is not completely clear. Gentiana lutea subsp.
Bogo G. +5 more
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Effect of rootstocks on floral nectar composition in apple cultivars
Plant Systematics and Evolution, 2003Insect attraction of flowers in apple cultivars is an essential question from the viewpoint of fruit yield, since apple flowers are autosterile and entomogamous. Therefore, it is important to study the two most significant factors of primary attraction, pollen and nectar production.
E. Nagy Tóth +3 more
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