Poisonous weeds are a serious threat to cattle in countries where animals are fed on natural as well as planted pastures. These may cause slight to severe lesions to different organs and, ultimately, death depending on the toxic principle and amount of ingested plant material. Wedelia glauca (Ort.) Hoffm. ex Hicken (Asteraceae) is a perennial plant from South America present in Southern Brazil,...

The synthesis of H(2)O-soluble and NaOH-hydrolyzable bound forms of indole-3-acetic acid (IAA) in petiole slices of Nicotiana glauca, Nicotiana langsdorffii, and their tumorous and nontumorous hybrids in the presence of exogenous (14)C-IAA was investigated. The synthesis of conjugates progressively increased during 6 hours of incubation in (14)C-IAA. The results showed that the rate of synthesi...

Little is known about the paleoecological histories of the three spruce species (white spruce, Picea glauca; black spruce, P. mariana; and red spruce P. rubens) in eastern North America, largely because of the difficulty of separating the three species in the pollen record. We describe a novel and effective classification method of distinguishing pollen grains on the basis of quantitative analy...

Lindera glauca fruits (LGF) with the abundance of terpenoid and oil has emerged as a novel specific material for industrial and medicinal application in China, but the complex regulatory mechanisms of carbon source partitioning into terpenoid biosynthetic pathway (TBP) and oil biosynthetic pathway (OBP) in developing LGF is still unknown. Here we perform the analysis of contents and composition...

Crosses between three distinct species in Nicotiana are comparatively rare, only nine having appeared in the literature on this genus. The one here reported upon, (rustica Xpaniculata) x Langsdor i , as well as (rustics X Tabacum) Xpaniculata, and (rustica X paniculata) XgZutinosa, was produced in Europe many years ago (EAST 1928) but has not been studied much since. In 1930 KOSTOFF also descri...

To improve their nutrition, most plants associate with soil microorganisms, particularly fungi, to form mycorrhizae. A few lineages, including actinorhizal plants and legumes are also able to interact with nitrogen-fixing bacteria hosted intracellularly inside root nodules. Fossil and molecular data suggest that the molecular mechanisms involved in these root nodule symbioses (RNS) have been pa...

Water flux across cell membranes has been shown to occur not only through the lipid bilayer, but also through aquaporins, which are members of the major intrinsic protein (MIP) super-family of channel proteins. Aquaporins greatly increase the membrane permeability for water, but may also be regulated, allowing cellular control over the rate of water influx/efflux. Water flux is crucial for stom...

We describe a new species of small strabomantid frog (genus Psychrophrynella) from a humid montane forest in the Peruvian Department of Puno. Specimens were collected at 2,225 m a.s.l. in the leaf litter of primary montane forest near Thiuni, along the Macusani-San Gabán road, in the province of Carabaya. The new species is assigned to Psychrophrynella on the basis of morphological similarity, ...

Ratios of ammonium (NH 4 ‡) to nitrate (NO 3 ±) in soils are known to increase during forest succession. Using evidence from several previous studies, we hypothesize that a malfunction in NH 4 ‡ transport at the membrane level might limit the persistence of early successional tree species in later seral stages. In those studies, 13 N radiotracing was used to determine unidirectional fluxes and ...

Abstract Background Suaeda glauca ( S. ) is a halophyte widely distributed in saline and sandy beaches, with strong saline-alkali tolerance. It also admired as landscape plant high development prospects scientific research value. The chloroplast (cp) genome has recently been reported; however, the mitochondria (mt) still unexplored. Results mt of were assembled based on reads from Pacbio Illumi...