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Flowering, Pollen, Plant reproduction, Allergens

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https://www.readbyqxmd.com/read/25372614/projected-carbon-dioxide-to-increase-grass-pollen-and-allergen-exposure-despite-higher-ozone-levels
#1
Jennifer M Albertine, William J Manning, Michelle DaCosta, Kristina A Stinson, Michael L Muilenberg, Christine A Rogers
One expected effect of climate change on human health is increasing allergic and asthmatic symptoms through changes in pollen biology. Allergic diseases have a large impact on human health globally, with 10-30% of the population affected by allergic rhinitis and more than 300 million affected by asthma. Pollen from grass species, which are highly allergenic and occur worldwide, elicits allergic responses in 20% of the general population and 40% of atopic individuals. Here we examine the effects of elevated levels of two greenhouse gases, carbon dioxide (CO2), a growth and reproductive stimulator of plants, and ozone (O3), a repressor, on pollen and allergen production in Timothy grass (Phleum pratense L...
2014: PloS One
https://www.readbyqxmd.com/read/24361781/statistical-approach-to-the-analysis-of-olive-long-term-pollen-season-trends-in-southern-spain
#2
H García-Mozo, L Yaezel, J Oteros, C Galán
Analysis of long-term airborne pollen counts makes it possible not only to chart pollen-season trends but also to track changing patterns in flowering phenology. Changes in higher plant response over a long interval are considered among the most valuable bioindicators of climate change impact. Phenological-trend models can also provide information regarding crop production and pollen-allergen emission. The interest of this information makes essential the election of the statistical analysis for time series study...
March 1, 2014: Science of the Total Environment
https://www.readbyqxmd.com/read/19070936/production-of-male-and-female-sterile-plants-through-reproductive-tissue-ablation
#3
Nicole Gardner, Roderick Felsheim, Alan G Smith
Male and female sterilities have many useful applications in horticultural crops, including reducing the invasive potential of new ornamentals, elimination of pollen allergens and redirecting resources from seeds to vegetative growth. In this study, we tested a male- and female-sterility (MS; FS) gene construct in Nicotiana tabacum to evaluate its effectiveness and effect on phenotype. Three T1 Nicotiana tabacum lines expressing the MS (p108:barnase) and FS (sp41:barnase) genes (MS/FS lines) and a control Nicotiana tabacum line (WT GUS) were measured for plant height, leaf length and width, corolla length, number of nodes on the main stem and stem diameter...
May 15, 2009: Journal of Plant Physiology
https://www.readbyqxmd.com/read/17593535/biomonitoring-of-heavy-metals-by-pollen-in-urban-environment
#4
D M Kalbande, Sharda N Dhadse, P R Chaudhari, S R Wate
Abstract Industrial development and consumption of petroleum products leads to increase air pollution levels especially in urban and industrial areas. Heavy metal components associated with air pollutants have far reaching effects with respect to economic and ecological importance of pollens. The pollens are male reproductive organs of the plant and travel through air from flower to flower for pollination purpose. During this period they are exposed to air pollutants. Present investigation thus pertains to study of effect of air pollutants on pollens especially biosorption and bioaccumulation of heavy metals...
March 2008: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/16759986/interaction-of-the-onset-of-spring-and-elevated-atmospheric-co2-on-ragweed-ambrosia-artemisiifolia-l-pollen-production
#5
Christine A Rogers, Peter M Wayne, Eric A Macklin, Michael L Muilenberg, Christopher J Wagner, Paul R Epstein, Fakhri A Bazzaz
Increasing atmospheric carbon dioxide is responsible for climate changes that are having widespread effects on biological systems. One of the clearest changes is earlier onset of spring and lengthening of the growing season. We designed the present study to examine the interactive effects of timing of dormancy release of seeds with low and high atmospheric CO2 on biomass, reproduction, and phenology in ragweed plants (Ambrosia artemisiifolia L.), which produce highly allergenic pollen. We released ragweed seeds from dormancy at three 15-day intervals and grew plants in climate-controlled glass-houses at either ambient or 700-ppm CO2 concentrations, placing open-top bags over influorescences to capture pollen...
June 2006: Environmental Health Perspectives
https://www.readbyqxmd.com/read/3331269/-male-female-recognition-during-sexual-reproduction-in-flowering-plants
#6
REVIEW
E Matthys-Rochon, T Gaude, C Dumas
In flowering plants, the recognition reactions occur between male and female partners at the stigma level or along the style and in the embryo sac between the gametes. The study of these biological events implies to check the viability of the two partners. Interacting molecules are glycoproteins. A cDNA coding for the stigma protein molecules has recently been cloned. The specific pollen molecules have been also characterized. They are glycoproteins which are localized at the periphery of the grain and rapidly diffuse...
June 1987: Allergie et Immunologie
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