Results 321 to 330 of about 298,868 (346)

Actin in Pollen and Pollen Tubes

2000
Flowering plants rely on the highly polarized process of pollen tube growth for delivery of the sperm cells and thus for sexual reproduction. Although it has long been known that the actin cytoskeleton is necessary for pollen grain germination and tube growth, the precise structure of the actin arrays and their regulation by actin-associated proteins ...
Luis Vidali, Peter K. Hepler
openaire   +2 more sources

Pollen and Pollinosis

2014
Pollen grains only represent a small fraction of the total amount of the viable biological particles present in the air, but pollen are the most important aeroallergens in the outdoor environment. The analysis of pollen has traditionally been carried out by microscopy, which can be traced back to the 17th century.
Matt Smith, Uwe Berger, Heidrun Behrendt, Karl-Christian Bergmann   +3 more
openaire   +3 more sources

Pollen and Pollen Tube Proteomics

2007
Germinated pollen grains form pollen tubes that accomplish rapid polar- ized growth within female gametophytic tissues in order to deliver the sperm cell to the ovule. This process is essential for successful plant fertilization in vivo. Pollen tubes are considered to be an ideal model system to study tip growth. A more com- prehensive understanding of
Nils Böhm, Yanmei Chen, Jinxing Lin, Tong Chen, Jozef Šamaj, Xiaoqin Wu   +5 more
openaire   +2 more sources

Season and landscape composition affect pollen foraging distances and habitat use of honey bees.

Ecological Applications, 2016
Honey bees (Apis mellifera L.) show a large variation in foraging distances and use a broad range of plant species as pollen resources, even in regions with intensive agriculture.
Nadja Danner, A. Molitor, S. Schiele, S. Härtel, I. Steffan‐Dewenter   +4 more
semanticscholar   +1 more source

Bacterial microbiota associated with flower pollen is influenced by pollination type, and shows a high degree of diversity and species-specificity.

Environmental Microbiology, 2016
Diverse microorganisms colonise the different plant-microhabitats, such as rhizosphere and phyllosphere, and play key roles for the host. However, bacteria associated with pollen are poorly investigated, despite its ecological, commercial and medical ...
Binoy Ambika Manirajan, S. Ratering, V. Rusch, A. Schwiertz, Rita Geissler-Plaum, Massimiliano Cardinale, S. Schnell   +6 more
semanticscholar   +1 more source

Cryopreservation of Pollen and Pollen Embryos, and the Establishment of Pollen Banks

1987
Publisher Summary The cryopreservation of pollen plays an important role in hybridization programs and in the conservation of genetic resources in agricultural and forest biotechnology. In addition to the several potentials outlined, the most important aspect is the storage of “recalcitrant” pollen of important fruit and forest trees and agricultural
openaire   +2 more sources

Allergenic Pollen and Pollen Allergy in Europe

2017
Aerobiological and allergological studies show that the pollen map of Europe is changing also as a result of cultural factors (e.g., importation of plants such as birch and cypress for urban parklands), greater international travel (e.g., colonization by ragweed in France, northern Italy, Austria, Hungary, etc.) and climate change.
D'amato G., Vitale C., Sanduzzi A., Molino A., Vatrella A., D'amato M.   +5 more
openaire   +4 more sources

Reevaluation of pollen quantitation by an automatic pollen counter

Allergy and Asthma Proceedings, 2010
Accurate and detailed pollen monitoring is useful for selection of medication and for allergen avoidance in patients with allergic rhinitis. Burkard and Durham pollen samplers are commonly used, but are labor and time intensive. In contrast, automatic pollen counters allow simple real-time pollen counting; however, these instruments have difficulty in ...
Kunihiko Yokota, Satoshi Okumura, Hideaki Chazono, Minako Hisamitsu, Yoshitaka Okamoto, Yukie Takahashi, Syuji Yonekura, Toyoyuki Hanazawa, Mutarifu Muradil, Shigetoshi Horiguchi   +9 more
openaire   +3 more sources

Pollen limitation of plant reproduction: Ecological and evolutionary causes and consequences

, 2004
Determining whether seed production is pollen limited has been an area of intensive empirical study over the last two decades. Yet current evidence does not allow satisfactory assessment of the causes or consequences of pollen limitation.
T. Ashman, T. Knight, J. Steets, P. Amarasekare, M. Burd, D. Campbell, Michele R. Dudash, M. Johnston, S. Mazer, R. Mitchell, M. Morgan, W. Wilson   +11 more
semanticscholar   +1 more source

Dynein-related polypeptides in pollen and pollen tubes

Sexual Plant Reproduction, 1996
Microtubules in pollen tubes are evident within the vegetative and generative cell cytoplasm. This observation led to the formulation of several hypotheses regarding the role of microtubules in cytoplasmic movement and the migration of the vegetative nucleus/generative cell along the pollen tube. The study of microtubular motor proteins in pollen tubes
Moscatelli A., CAI, GIAMPIERO, Liu G.Q., Tiezzi A., CRESTI, MAURO   +4 more
openaire   +3 more sources