Navigation Links
Pollen also appears outside flowering season
Date:3/18/2011

"There is of course a very close relationship between the moment at which pollen is released by plants and the data gathered by the traps used to measure these grains, but this is not always the case", Rafael Tormo, a botanist from the University of Extremadura and co-author of the paper, tells SINC.

His team found delays or advances of up to a week between the time when the pollen of allergenic grass species (from genuses such as Poa, Agrostis, Bromus and Avena) and cupressaceae (cypresses and Arizona pine) are present in the air and their flowering period.

According to the study, which has been published in the International Journal of Biometeorology, these differences are probably due to the phenomenon of "resuspension" of the grains, caused by the wind and by pollen being transported from distant sources.

"Now, for example, the Holm oaks in Extremadura have still not flowered, but those in Andalusia have done. If the wind blows from the south, the pollen traps in Extremadura will already be able to detect Holm oak pollen", explains Tormo, who highlights the importance of understanding the phenology of plant flowering in order to draw up precise pollen prognoses for people with allergies.

On the Iberian Peninsula and in the rest of Europe, the process of flowering moves from south to north, in such a way that the pollen traps "anticipate flowering" if the wind blows from the south. On the other hand, if the wind blows from the north they may record pollen from more northerly latitudes even if the pollination period in the region they are located in is already over.

Traps and field visits

In order to carry out the study, the scientists measured pollen levels from 2007, using an aerobiological trap in Badajoz. The team also travelled to parks and fields around the city in order to verify in situ that pollen was being released by plants, by shaking the male inflorescences and cones.

"Direct observation is a very useful tool for understanding which plants are in flower and assessing their abundance, providing valuable information to complement the data from the traps", says Tormo.

Despite the data from grasses and cypresses, the results of the study show that the flowering period does coincide with the data recorded by the traps for most tree species (Holm oaks, corks, olives and plane trees), as well as for herbaceous species such as plantains.

In the case of grassy species, it has additionally been observed that most of the airborne pollen comes from a few species within this family, such as Dactylis glomerata, Trisetum paniceum, Lolium rigidum, Phalaris minor and Vulpia geniculata.

The research group also has pollen traps in Plasencia (Cceres) and Santa Eulalia (Badajoz), and it is planning to set up another in the south of Extremadura. "It is like weather data the more stations you have and the greater the number of years of observations available, the more valuable the information is", the researcher concludes.


'/>"/>

Contact: SINC
info@plataformasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

Related biology news :

1. UF Pine lsland pollen study leads to revision of states ancient geography
2. Amount of dust, pollen matters for cloud precipitation, climate change
3. Gone with the wind: Far-flung pine pollen still potent miles from the tree
4. Algae and pollen grains provide evidence of remarkably warm period in Antarcticas history
5. Antibiotic appears safe for stroke patients and good companion for tPA
6. Temperature constancy appears key to tropical biodiversity
7. Invasive tunicate appears in Oregons coastal waters
8. Little melamine appears in eggs from chickens on highly contaminated feed
9. Breast cancer drug fulvestrant appears more effective in the presence of CK8 and CK18
10. Caffeine appears to be beneficial in males -- but not females -- with Lou Gehrigs disease
11. Caffeine appears to be beneficial in males -- but not females -- with Lou Gehrigs disease
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Pollen also appears outside flowering season
(Date:5/6/2017)... RAM Group , Singaporean based ... in biometric authentication based on a novel  ... to perform biometric authentication. These new sensors are based on ... Ram Group and its partners. This sensor will have ... and security. Ram Group is a next generation ...
(Date:4/18/2017)... , April 18, 2017  Socionext Inc., a global expert ... a media edge server, the M820, which features the company,s hybrid ... software provided by Tera Probe, Inc., will be showcased during the ... the NAB show at the Las Vegas ... ...
(Date:4/13/2017)... According to a new market research report "Consumer ... Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and Region - ... to grow from USD 14.30 Billion in 2017 to USD 31.75 Billion ... ... MarketsandMarkets Logo ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... 11, 2017  VMS BioMarketing, a leading provider of patient ... Clinical Nurse Educator (CNE) network, which will launch this week. ... among health care professionals to enhance the patient care experience ... and other health care professionals to help women who have ... ...
(Date:10/10/2017)... ... October 10, 2017 , ... San Diego-based team building and cooking events company, ... today. The bold new look is part of a transformation to increase awareness, ... significant growth period. , It will also expand its service offering from its signature ...
(Date:10/10/2017)... , Oct. 10, 2017 SomaGenics announced ... the NIH to develop RealSeq®-SC (Single Cell), expected to ... profiling small RNAs (including microRNAs) from single cells using ... highlights the need to accelerate development of approaches to ... "New techniques for measuring levels of ...
(Date:10/9/2017)... ... October 09, 2017 , ... At its national board meeting in ... professor in Harvard University’s Departments of Physics and Astronomy, has been selected for membership ... the winning team for the 2015 Breakthrough Prize in Fundamental physics for the discovery ...
Breaking Biology Technology: