نتایج جستجو برای: pollen

تعداد نتایج: 20847  

Journal: :American journal of botany 2003
James H Cane Daniel Schiffhauer

Comparisons of pollinator efficacy using pollen received on stigmas can be refined by incorporating experimental dose-response relationships for pollen deposition and fruiting responses. A range of discrete pollen doses applied to cranberry stigmas resulted in decelerating curvilinear responses for fruiting, berry size, and seed set. Minimum thresholds and maximum asymptotes bounded reproductiv...

Journal: :Journal of investigational allergology & clinical immunology 2016
R Asero G Mistrello S Amato

BACKGROUND Polcalcins are highly cross-reactive pollen panallergens. Less than 10% of allergic patients are sensitized to polcalcins. All pollen species are considered able to sensitize patients to this panallergen. OBJECTIVE We aimed to assess the presence of polcalcins in various pollen extracts used in allergen immunotherapy. METHODS ELISA inhibition experiments were performed with sera ...

2012
Thomas van Hengstum Danny A. P. Hooftman Hans C. M. den Nijs Peter H. van Tienderen

Greenhouses are a well-accepted containment strategy to grow and study genetically modified plants (GM) before release into the environment. Various containment levels are requested by national regulations to minimize GM pollen escape. We tested the amount of pollen escaping from a standard greenhouse, which can be used for EU containment classes 1 and 2. More specifically, we investigated the ...

Journal: :Iranian journal of allergy, asthma, and immunology 2010
Mohsen Tehrani Mojtaba Sankian Mohammad Ali Assarehzadegan Reza Falak Farahzad Jabbari Abdolreza Varasteh

The importance of Amaranthus retroflexus pollen in causing respiratory allergy has been well ascertained in many countries including Iran with a high positive rate (69%) among Iranian allergic patients. The aim of the present study is to identify the allergenic properties of A. retroflexus pollen. Sixteen patients with allergy to A. retroflexus pollen were selected for the study. The antigenic ...

2017
Nadja Danner Alexander Keller Stephan Härtel Ingolf Steffan-Dewenter

The availability of pollen in agricultural landscapes is essential for the successful growth and reproduction of honey bee colonies (Apis mellifera L.). The quantity and diversity of collected pollen can influence the growth and health of honey bee colonies, but little is known about the influence of landscape structure on pollen diet. In a field experiment, we rotated 16 honey bee colonies acr...

2014
Yuefeng Guan Jianping Lu Juan Xu Bruce McClure Shuqun Zhang

Double fertilization in flowering plants requires the delivery of two immotile sperm cells to the female gametes by a pollen tube, which perceives guidance cues, modifies its tip growth direction, and eventually enters the micropyle of the ovule. In spite of the recent progress, so far, little is known about the signaling events in pollen tubes in response to the guidance cues. Here, we show th...

Journal: :Plant physiology 2008
Dong Zhang Diego Wengier Bin Shuai Cai-Ping Gui Jorge Muschietti Sheila McCormick Wei-Hua Tang

In flowering plants, the process of pollen germination and tube growth is required for successful fertilization. A pollen receptor kinase from tomato (Solanum lycopersicum), LePRK2, has been implicated in signaling during pollen germination and tube growth as well as in mediating pollen (tube)-pistil communication. Here we show that reduced expression of LePRK2 affects four aspects of pollen ge...

2011
Idalia Kasprzyk Dorota Myszkowska Łukasz Grewling Alicja Stach Branko Šikoparija Carsten Ambelas Skjøth Matt Smith

Previous studies have shown that ragweed pollen arrives in Poland from sources in the south, in Slovakia, the Czech Republic, Hungary and Austria. It is likely that ragweed pollen also arrives from sources in the southeast (e.g. Ukraine). This hypothesis was investigated using 13 years of pollen data and back-trajectory analysis. Ambrosia pollen data were collected at three sites in Poland, Rze...

2014
Long-Xi Yu Mandayam V. Parthasarathy

Profilin is an actin-binding protein involved in the dynamic turnover and restructuring of the actin cytoskeleton in all eukaryotic cells. We previously cloned a profilin gene, designated as LePro1 from tomato pollen. To understand its biological role, in the present study, we investigated the temporal and spatial expression of LePro1 during pollen development and found that the transcript was ...

2016
Li-Juan Zhao Hong-Mei Yuan Wen-Dong Guo Chuan-Ping Yang

Pollen tubes are an ideal model for the study of cell growth and morphogenesis because of their extreme elongation without cell division; however, the genetic basis of pollen germination and tube growth remains largely unknown. Using the Illumina/Solexa digital gene expression system, we identified 13,017 genes (representing 28.3% of the unigenes on the reference genes) at three stages, includi...

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