There are many studies dedicated to the allergic nose, but most of them deal with seasonal allergic rhinitis and particularly with acute experimental situations. Perennial allergic rhinitis is less well documented. When studying the allergic nose, several aspects must be taken into consideration: the genetic background of the patient, various environmental factors (antigens, air pollution, clim...

The fungus Magnaporthe oryzae Couch (anamorph = Pyricularia oryzae Cavara) (previously known as Magnaporthe grisea (Herbert) Barr) (4) causes gray leaf spot disease of perennial ryegrass (Lolium perenne L.) (12). In recent years, this disease has become a serious but sporadic problem for turfgrass managers in the mid-Atlantic and midwestern United States (9,12,16, 20,22). The disease can cause ...

Following the flurry of plant exploration in the 1950's, most activity with the plants collected apparently centred on expanding the area of adaptation of perennial grass and annual legume. Many of the subsequently released grass cultivars have been agronomically successful but have not been adopted. Haifa white clover, released by the New South Wales Department of Agriculture 25 years after co...

Perennial crop production is inherently dynamic due to several salient physical characteristics including an establishment period of several years, long lives in commercial production, and pathdependence of yields on input use and other exogenous factors such as weather. While perennial crop production is properly regarded as a dynamic investment under uncertainty, the literature on regional ag...

The aim of this paper is to evaluate seed bank density and composition along a semi-arid gypsum gradient in Central Spain. Seed bank density was relatively high (16,214 seed/m) with a very clumped spatial distribution. Landform and microslope were the best predictors for seed density, indicating that density can be at least partly interpreted as a result of the physical processes regulating sec...

Jiang, Y., J. Tang, X. Yu and J. Camberato. 2013. Growth and Physiological Responses of Diverse Perennial Ryegrass Accessions to Increasing Salinity. 2012 Annu. Rep. Purdue Univ. Turfgrass Sci. Progr. p. 7-11. Summary: Ten diverse accessions of perennial ryegrass (Lolium perenne L.) were grown in sand culture and exposed to a half-Hoagland solution amended with 0 (control), 50-, 100-, 150-, 200...

Ninety five patients with perennial rhinitis were examined clinically and various investigations were done in order to find out the common allergens and to assess the value of various tests in perennial rhinitis. In this study group 94% of cases were proven to be cases of allergic rhinitis. Cat fur was found to be the commonest allergen. Grass pollen which is a common allergen in European count...

Metabolic profiling was carried out in the forage grass Lolium perenne L. (perennial ryegrass) to uncover mechanisms involved in the plants response to water stress. When leaf and root materials from two genotypes, with a contrasting water stress response, were analysed by GC-MS, a clear difference in the metabolic profiles of the leaf tissue under water stress was observed. Differences were pr...