From the overground parts of an endemic Sideritis species, S. stricta, 4 diterpenes, sideridiol (1), isosidol (2), isolinearol (3), and linearol (4); 2 flavonoid glycosides, isoscutellarein 7-O-[6′′′-O-acetyl-β-Dallopyranosyl-(1→2)]-β-D-glucopyranoside (5), and isoscutellarein 7-O-[6′′′-O-acetyl-β-D-allopyranosyl(1→2)]-6′′-O-acetyl-β-D-glucopyranoside (6); a methoxyflavone, xanthomicrol (7); an...

The circadian clock is an important determinant of fitness that entrained by local conditions. Aside from abiotic factors, individual pathogenic soil bacteria affect function in plant hosts. Yet, nature, plants interact with diverse microbial communities, and the effect complex communities on remains unclear. In Arabidopsis thaliana its wild relative, Boechera stricta, we used rhizosphere inocu...

Pollen grain morphology of Bromeliaceae species collected in areas of the Atlantic Rainforest of southeastern Brazil was studied. The following species were analyzed: Aechmea bambusoides L.B.Sm. & Reitz, A. nudicaulis (L.) Griseb., A. ramosa Mart. ex Schult.f., Ananas bracteatus (Lindl.) Schult.f., Billbergia distachia (Vell.) Mez, B. euphemiae E. Morren, B. horrida Regel, B. zebrina (Herb.) Li...

Prickly pear fruits constituted valuable foodstuff for humans and animals in arid and semi-arid regions. Two species of prickly pear from Tunisia, Opuntia ficus indica and Opuntia stricta, were investigated for fatty acid composition and physicochemical parameters of the seed oil. No significant difference in either physical or chemical parameters was found between the species. The main fatty a...

For 120 specimens and fi gures of Fragilariforma, 10 Legendre coeffi cients were calculated as shape descriptors. For each half valve apically bisected, 50 x,y coordinates were used to calculate Legendre coeffi cients. Principal components analysis (PCA) was used to ordinate the shape descriptors as a total shape gradient of valve forms. The fi rst four principal components explained 90.3 % of ...

Warmer and drier climates have shifted phenologies of many species. However, the magnitude and direction of phenological shifts vary widely among taxa, and it is often unclear when shifts are adaptive or how they affect long-term viability. Here, we model evolution of flowering phenology based on our long-term research of two species exhibiting opposite shifts in floral phenology: Lythrum salic...

Many widely known invasive plants are well integrated into native plant–pollinator networks. Typically, these invaders have entomophilous flowerswhich are visited by a diverse array of pollinators. The type of breeding system and the role that pollination services play in the reproductive success of invasive plants have, however, received little attention. We studied the breeding system and pol...

BACKGROUND AND AIMS Oxalis debilis is a South American tristylous species that is currently naturalizing in China. Based on field observations and herbarium data a report is made on its pollination, morph frequencies, pollen viability, seed set and chromosome number. In addition, a new chromosome count for the species in Africa is provided. METHODS Field observations were conducted in six pro...