Characterization of selenium and sulfur accumulation across the genus Stanleya (Brassicaceae): A field survey and common‐garden experiment

Abstract

The S. pinnata species complex has a range of physiological properties making it an attractive system to study the evolution of Se hyperaccumulation. Beyond the basic scientific value of understanding the evolution of this fascinating trait, we can potentially use S. pinnata or its genes for environmental cleanup and/or nutrient-enhanced dietary material.

Transcriptome‐wide comparison of selenium hyperaccumulator and nonaccumulator Stanleya species provides new insight into key processes mediating the hyperaccumulation syndrome

“…The expression of sultr2;1 , sultr2;2 and sultr3;5 , which are thought to mediate the flux of sulphate through phloem and xylem parenchyma cells (Kataoka et al ., ), were also higher in S. pinnata than S. elata . This explains why S. pinnata had a greater rate of Se root‐to‐shoot translocation and source‐to‐sink remobilization than S. elata in an earlier study (Cappa et al ., ). In hyperaccumulator Astragalus species, groups 1 through 4 sultr genes were also found to be constitutively up‐regulated (Cabannes et al ., ).…”

“…The dried shoot material was acid digested and analysed for Se and S levels using ICP‐OES as described by Cappa et al . ().…”

Pseudomonas moraviensissubsp. stanleyae, a bacterial endophyte of hyperaccumulatorStanleya pinnata, is capable of efficient selenite reduction to elemental selenium under aerobic conditions

“…; Cappa et al . ). In S. pinnata , Se is stored predominantly in organic forms, which it reductively assimilates from selenate (Freeman et al .…”

Selenium distribution and speciation in plant parts of wheat (Triticum aestivum) and Indian mustard (Brassica juncea) from a seleniferous area of Punjab, India

“…This is possible thanks to a detoxification process based on the conversion of more toxic inorganic Se or Se amino acids into organic and non-protein-compatible Se compounds, mainly by methylation (De Souza et al, 1998;Terry et al, 2000;Ellis and Salt, 2003). Moreover, Brassicaceae are known to have high sulfur levels and unique S compounds which could also contribute to their high Se accumulation capacity and might explain the higher enrichment compared to wheat (Cobbet and Goldsbrough, 2002;Cappa et al, 2014).…”