Changes in airborne pollen concentrations in Delhi, India

Singh, Anand B.; Pandit, Terlika; Dahiya, Pushpa

doi:10.1080/00173130310016149

Cited by 26 publications

(13 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Male B . papyrifera plants produce large quantities of pollen, as attested in India and Pakistan [ 27 ; 28 , 29 ] where the airborne pollen of large numbers of male plants have become a public health problem. Since paper mulberry in Polynesia generally is cut before it flowers, it seems unlikely that pollen or seeds will be found in archaeological sites [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Sex Distribution of Paper Mulberry (Broussonetia papyrifera) in the Pacific

et al. 2016

View full text Add to dashboard Cite

BackgroundPaper mulberry (Broussonetia papyrifera (L.) L'Hér. ex Vent) is a dioecious tree native to East Asia and mainland Southeast-Asia, introduced prehistorically to Polynesia as a source of bark fiber by Austronesian-speaking voyagers. In Oceania, trees are coppiced and harvested for production of bark-cloth, so flowering is generally unknown. A survey of botanical records of paper mulberry revealed a distributional disjunction: the tree is apparently absent in Borneo and the Philippines. A subsequent study of chloroplast haplotypes linked paper mulberry of Remote Oceania directly to a population in southern Taiwan, distinct from known populations in mainland Southeast-Asia.MethodologyWe describe the optimization and use of a DNA marker designed to identify sex in paper mulberry. We used this marker to determine the sex distribution in selected localities across Asia, Near and Remote Oceania. We also characterized all samples using the ribosomal internal transcribed spacer sequence (ITS) in order to relate results to a previous survey of ITS diversity.ResultsIn Near and Remote Oceania, contemporary paper mulberry plants are all female with the exception of Hawaii, where plants of both sexes are found. In its natural range in Asia, male and female plants are found, as expected. Male plants in Hawaii display an East Asian ITS genotype, consistent with modern introduction, while females in Remote Oceania share a distinctive variant.ConclusionsMost paper mulberry plants now present in the Pacific appear to be descended from female clones introduced prehistorically. In Hawaii, the presence of male and female plants is thought to reflect a dual origin, one a prehistoric female introduction and the other a modern male introduction by Japanese/Chinese immigrants. If only female clones were dispersed from a source-region in Taiwan, this may explain the absence of botanical records and breeding populations in the Philippines and Borneo, and Remote Oceania.

show abstract

Section: Introductionmentioning

confidence: 99%

Sex Distribution of Paper Mulberry (Broussonetia papyrifera) in the Pacific

et al. 2016

View full text Add to dashboard Cite

show abstract

“…This tendency towards increasing pollen concentrations of these taxa have been reported in Neuchaˆtel, Switzerland (Clot, 2003), for Ambrosia in North Italy (Mandrioli et al, 1998a), Vienna, Austria (Ja¨ger, 2000) and Prague, Czech Republic (Rybnicˇek et al, 2000). However, in contrast, in Delhi, India, a decrease in the concentration of ragweed pollen has been noted (Singh et al, 2003). In view of these differences, the results obtained in Szczecin should be confirmed in a long-term study.…”

Section: Discussionmentioning

confidence: 70%

Ragweed and mugwort pollen in Szczecin, Poland

Puc

2006

Aerobiologia

View full text Add to dashboard Cite

Ragweed (genus Ambrosia) and mugwort (Artemisia vulgaris) pollen grains are known to be very potent aeroallergens, often noted to enter into cross reactions. The aim of the study was to analyse ragweed and mugwort pollen release in Szczecin (western Poland) during the period 2000-2003. Measurements were performed by the volumetric and gravimetric method. Pollen seasons were defined as the periods of 90% of the total catch. Of the 4 years studied, the lowest concentration of ragweed pollen was observed in 2000. In 2000, the annual ragweed pollen count was very high, threefold higher than in 2001. There was a high Ambrosia pollen count in 2003, with the highest daily value of 84 grains/m 3 . The mugwort pollen season started in the third 10-day period of July and lasted to the end of August in all of the years studied. Analysis of pollen deposition from different Szczecin cityÕs districts showed that the highest exposure to ragweed pollen allergens occurred in the Majowe district, which is related to the presence of numerous plants of Ambrosia in that district. The mugwort pollen deposition was more abundant in the _ Zelechowa district, which is an area with villas and gardens. Statistically significant correlations were found between the ragweed pollen count in the air and the maximum wind speed, air temperature and relative humidity and between the mugwort pollen count in the air and air temperature and relative humidity.

show abstract

“…2(D-F)). In this season, enhanced emission of pollens and epicuticular waxes from other plant parts is common, which may further be enhanced by convection or dust storm assisted re-suspension of the soil containing drydegraded plant organic matter (Simoneit, 2002;Singh et al, 2003;Tandon et al, 2008). Direct suspension of crystalline epicuticular wax protrusions from the leave surfaces during spring season is also assisted by wind abrasion and, sandblasting effect (Percy et al, 1994;Schefuß et al, 2003) to enhance the n-alkanes fraction in PM 10 (Rogge et al, 1993c).…”

Section: Monthly and Seasonal Variations In The Source(s) Contributiomentioning

confidence: 99%

Monthly and Seasonal Variations in Aerosol Associated n-alkane Profiles in Relation to Meteorological Parameters in New Delhi, India

Yadav

Tandon

Attri

2013

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

A one-year extensive investigation to assess monthly and seasonal variations in the PM 10 associated homologous series of n-alkane (C 11 -C 35 ) profiles was carried out in New Delhi, India. Quantitative estimation of n-alkanes, involving 3-4 PM 10 samples/month, was done by using thermal desorption gas chromatography mass spectrometry (TD-GC-MS). Significant seasonal variations were observed, both in mass concentrations (annual mean: 517 ± 256 ng/m 3 ) and mass fractions (annual mean: 4368 ± 2067 ppm) of total n-alkanes (C 11 -C 35 ). The impact of the Planetary Boundary Layer (PBL) on the n-alkane profiles was the most significant among all the meteorological parameters considered. A strong positive correlation (r = 0.84) between PM 10 load (μg/m 3 ) and mass concentrations of total n-alkanes (ng/m 3 ) was observed; whereas a negative correlation (r = -0.72) was seen between the PM 10 load and mass fractions of total n-alkanes (ppm). Annual mean values of the Carbon Preference Index (CPI) and Wax n-alkanes percentage (WNA%) stood at 2.2 ± 0.6 and 39 ± 10%, respectively. Established diagnostic tools indicated that during autumn, the dominant inputs of aerosol associated n-alkanes came from petrogenic (vehicular and industrial) emissions (72 ± 7%), with lesser contributions from biogenic activities (28 ± 7%). In other seasons, although petrogenic sources remained a dominant contributor (53 ± 6%-59 ± 14%), the contributions from biological sources were also comparable (41 ± 14%-47 ± 6%). Emissions of total n-alkanes from both petrogenic and biogenic sources were maximum during spring. In the rest of the months, small variations were observed in the emissions of total n-alkanes from petrogenic sources, whereas large variations were noted in the emissions from biogenic sources.

show abstract

Changes in airborne pollen concentrations in Delhi, India

Cited by 26 publications

References 7 publications

Sex Distribution of Paper Mulberry (Broussonetia papyrifera) in the Pacific

Sex Distribution of Paper Mulberry (Broussonetia papyrifera) in the Pacific

Ragweed and mugwort pollen in Szczecin, Poland

Monthly and Seasonal Variations in Aerosol Associated n-alkane Profiles in Relation to Meteorological Parameters in New Delhi, India

Contact Info

Product

Resources

About