Astragalus bisulcatus and Stanleya pinnata hyperaccumulate selenium (Se) up to 1% of plant dry weight. In the field, Se was mostly present in the young leaves and reproductive tissues of both hyperaccumulators. Microfocused scanning x-ray fluorescence mapping revealed that Se was hyperaccumulated in trichomes in young leaves of A. bisulcatus. None of 10 other elements tested were accumulated in...

In this research, the uptake of Cu, Mo, Zn, As(III) and Cr(VI) by mesquite (Prosopis spp.) roots and shoots from two different sources was studied. The first source was seeds collected from plants grown in mine tailings in Arizona, USA (Seeds A) and the other source was seeds from a commercial vendor (Seeds B). In addition, the effects of above mentioned elements on plant growth and nutrient up...

nanosized hydroxyapatite and reversed-phase high performance liquid chromatography (RP-HPLC) for the simultaneous determination of organic acids (oxalic, malic, malonic, citric, and fumaric) and nitrate in xylem saps of the hyperaccumulator Alyssum murale is presented in this study. The optimum experimental conditions for the separation and determination of organic acids and nitrate are studied...

Many control approaches are used today to prevent the contamination of soils with heavy metals and remove pollution. One these is phytoremediation for on-site treatment pollutants. In phytoremediation, hyperaccumulator plants used, which absorb metals, accumulate at high levels in their tissues, neutralize them after various processes. It was aimed determine effects on plant growth metal accumu...

Noccaea caerulescens of the Brassicaceae family has become the key model plant among the metal hyperaccumulator plants. Populations/accessions of N. caerulescens from geographic locations with different soil metal concentrations differ in their ability to hyperaccumulate and hypertolerate metals. Comparison of transcriptomes in several accessions provides candidates for detailed exploration of ...

The study of Triglochin maritima L. was carried out on the Pomor (western) coast White Sea, in Republic Karelia (64°22'81"N, 35°93'14"E). Morphological analysis aboveground and underground parts clones performed virginal plants. Anatomical leaf sheaths current year shoots, rhizomes adventitious roots out. viability pollen assessed by determining relative share normally developed malformed grain...

Hyperaccumulators tolerate and accumulate extraordinarily high concentrations of heavy metals. Content of the metal chelator nicotianamine (NA) in the root of zinc hyperaccumulator Arabidopsis halleri is elevated compared with nonhyperaccumulators, a trait that is considered to be one of the markers of a hyperaccumulator. Using metabolite-profiling analysis of root secretions, we found that exc...

Cation/proton exchangers (CAXs) are a class of secondary energised ion transporter that are being implicated in an increasing range of cellular and physiological functions. CAXs are primarily Ca(2+) efflux transporters that mediate the sequestration of Ca(2+) from the cytosol, usually into the vacuole. Some CAX isoforms have broad substrate specificity, providing the ability to transport trace ...

Indian mustard (Brassica juncea) plants overexpressing ATP sulfurylase (APS transgenics) were previously shown to have higher shoot selenium (Se) levels and enhanced Se tolerance compared to wild type when supplied with selenate in a hydroponic system. Other transgenic Indian mustard overexpressing cystathionine-gamma-synthase (CGS) showed a higher Se volatilization rate, lower shoot Se levels,...