BACKGROUND Grasses release the most widespread aeroallergens with considerable sensitization rates, while different species produce several pollen concentration peaks throughout the season. This study analyzed the prevalence of grass species in three different European city areas and compared the flowering period of these species with daily pollen concentrations and the symptom loads of grass p...

In the framework of interaction nets 6], Yves Lafont has proved 8] that every interaction system can be simulated by a system composed of 3 symbols named , and. One may wonder if it is possible to nd a similar universal system with less symbols. In this paper, we show a way to simulate every interaction system with a speciic interaction system constituted of only 2 symbols. By transitivity, we ...

Los suelos sódicos ocupan una extensa proporción de la Depresión del Salado. El sodio aumenta el pH y provoca dispersión las arcillas generando modificaciones en estructura los que perjudican crecimiento cultivos al reducir su porosidad infiltración. La aplicación yeso puede mejorar características sódicos. Se realizó un ensayo se aplicaron tres dosis yeso: A) 0 kg/ha (testigo); B) 100 (en líne...

Vegetation succession was studied for 12 years on an abandoned nutrient-poor small field surrounded by a strip of natural grassland. No fertilizers or herbicides were applied. Few weeds or annuals were present during this period. Only two plants, i.e. Agrostis capillaris and Festuca rubra , dominated during the 12 years. At two spatial scales (0.04 and 0.4 m) a dramatic increase in species rich...

Ruminal solubility of N, K, P, Ca, Mg and S were measured for three forages at six growth stages. The three forages were Kentucky 31 tall fescue (TF), Kenhy fescue (KN) and a red clover-tall fescue mixture (RC). Disappearance parameters were measured by means of the dacron bag technique using cannulated steers. Exposures were for 48 h; maximum extent of disappearance for all elements occurred b...

BACKGROUND Phosphoglucose isomerase (PGI, EC 5.3.1.9) is an essential metabolic enzyme in all eukaryotes. An earlier study of the PgiC1 gene, which encodes cytosolic PGI in the grass Festuca ovina L., revealed a marked difference in the levels of nucleotide polymorphism between the 5' and 3' portions of the gene. METHODS In the present study, we characterized the sequence polymorphism in F. o...

UNLABELLED PREMISE OF THE STUDY Chloroplast microsatellite markers were developed for Festuca rubra to examine its population genetic characteristics, taxonomy, and coevolution with its endophyte Epichloë festucae. • METHODS AND RESULTS Thirteen polymorphic markers were identified from the chloroplast genome of a F. ovina accession and intergenic chloroplast sequences of F. rubra accession...

In plant species, control of flowering time is an important factor for adaptation to local natural environments. The Vrn1 , CO , FT1 and CK2α genes are key components in the flowering-specific signaling pathway of grass species. Meadow fescue is an agronomically important forage grass species, which is naturally distributed across Europe and Western Asia. In this study, meadow fescue flowering-...

Characterization of individual genetic variation within a plant population is an important component of plant conservation and evolutionary genetics. Here we present a marker-based approach to interpolating individual genetic information from a sample of plants to the whole population. The effectiveness of the approach was demonstrated by applying AFLP markers to estimate genetic distinctivenes...