Dynamics of dry matter and selenium accumulation in oilseed rape (Brassica napus L.) in response to organic and inorganic selenium treatments

Abstract

The uptake by and subsequent translocation of selenium (Se) within the plant is dependent on its chemical from and soil properties that dictate this trace element’s bioavailability. Plant species differ in their tendency to accumulate Se. Se taken-up by plants is returned to soil in plant residues, but the bioavailability of organic Se in those residues is poorly known. We investigated the impact of inorganic (Na2SeO4), organic (Se-enriched stem and leaf residues) Se applications and also soil microbial respiration on the growth and Se concentrations of various plant organs of oilseed rape (Brassica napus L.) during its development from the rosette to the seed filling stage. Both inorganic and organic Se slightly improved plant growth and enhanced plant development. Inorganic Se was more bioavailable than the organic forms and resulted in 3-fold to 6-fold higher Se concentrations in the siliques. Inorganic Se in autoclaved soil tended to elevate the Se concentration in all plant parts and at all growth stages. The organic Se raised Se concentrations in plants much less effectively than the inorganic selenate. Therefore, the use of inorganic Se is still recommended for biofortification.

Uptake and remobilization of selenium in Brassica napus L. plants supplied with selenate or selenium‐enriched plant residues

“…Ebrahimi et al. () described the details of the experimental set‐up. Briefly, oilseed rape seeds ( Brassica napus L. cv.…”

“…Plants were supplied twice (at the rosette and flowering stages) with 10 mL of a nutrient solution described by Ebrahimi et al. (). The experiment was designed to be completely randomized with three replications.…”

“…2 Material and methods 2.1 Pot experiment in greenhouse Ebrahimi et al (2015) described the details of the experimental set-up. Briefly, oilseed rape seeds (Brassica napus L. cv.…”

“…To avoid Se contamination, the control and Se-treated pots were placed in two separate greenhouse rooms with the same conditions (16 h : 8 h day : night, 60% humidity, and 22°C : 18°C day : night temperature). Plants were supplied twice (at the rosette and flowering stages) with 10 mL of a nutrient solution described by Ebrahimi et al (2015). The experiment was designed to be completely randomized with three replications.…”

Plant species and growing season weather influence the efficiency of selenium biofortification

“…The method used to analyze Se in plant samples has been described previously (Ebrahimi et al 2015). Briefly, 0.4-0.8 g of ground plant material was digested overnight in an acid mixture (HNO 3 :H 2 SO 4 : HClO 4 , 6:2:3).…”