Stipa robusta (= Stipa vaseyi) is a perennial grass found in certain areas of the southwestern United States. It is commonly known as sleepygrass, as horses that ingest this grass may become profoundly somnolent or stuporous for periods of time lasting up to several days. In an attempt to determine the active principle(s), fractionation of a methanolic extract of sleepygrass infected with an Ac...

Plants depend upon both genetic differences and phenotypic plasticity to cope with environmental variation over different timescales. The spatial variation in foliar δ(13)C levels along a moisture gradient represents an overlay of genetic and plastic responses. We hypothesized that such a spatial variation would be more obvious than the variation arising purely from a plastic response to moistu...

An understanding of the factors controlling plant community composition will allow improved prediction of the responses of plant communities to natural and anthropogenic environmental change. Using monitoring data from 1980 to 2009, we quantified the changes in community composition in Leymus chinensis and Stipa grandis dominated grasslands in Inner Mongolia under long-term grazing-exclusion an...

Celem przeprowadzonych badań była analiza plonowania i elementów struktury plonu czterech odmian pszenicy ozimej – trzech zwyczajnej (Triticum aestivum ssp. vulgare): ‘Laudis’, ‘Patinas’ ‘Danubius’ jednej odmiany twardej durum Desf.) ‘Lupidur’ oraz jarej dwóch ‘Nawra’ ‘Telimena’ Desf.): ‘Haristide’ ‘Floradur’ uprawianych w systemie rolnictwa konwencjonalnego. Doświadczenie polowe przeprowadzono...

PREMISE OF THE STUDY Stipa breviflora (Poaceae) is one of the dominant species of the desert steppe in the eastern Eurasian grasslands. Simple sequence repeat (SSR) markers were developed for use in genetic diversity studies of this species. METHODS AND RESULTS A total of 1954 potentially polymorphic loci were obtained by comparing transcriptome data of eight different S. breviflora individua...