2 research outputs found
Comparison of boron uptake and translocation in two vetiver genotypes and evaluation of boron removal efficiency of vetiver floating islands
<p>The objectives of this study were to identify genotypic differences in the uptake and translocation of boron (B) in vetiver (<i>Chrysopogon zizanioides</i> L.), a promising species in B phytoremediation, and to determine the efficiency of vetiver floating island system in B phytoremediation. Changes in plant biomass and B uptake and translocation were determined in two vetiver genotypes, Sierra and Sunshine, cultured hydroponically in a nutrient solution and exposed to six different B concentrations for 7 d and 14 d. The efficiency of B removal by Sierra (a high B accumulative genotype) grown in floating islands was also determined. Shoot B concentration differed significantly between the two genotypes but differences in root concentration were not significant. Root to shoot B transfer and B uptake ability were higher in Sierra than in Sunshine. The uptake and translocation of B was affected by B concentration and time of exposure. Sierra plants grown in floating islands were more efficient in B removal at lower B concentrations. Most of the B removed accumulated in the middle-upper sections of old leaves. Sierra is more suitable for the removal of B from wastewaters than Sunshine, especially in vetiver floating island system.</p
Effects of Interaction between Cadmium (Cd) and Selenium (Se) on Grain Yield and Cd and Se Accumulation in a Hybrid Rice (<i>Oryza sativa</i>) System
A pot experiment
was conducted to investigate the interactive effects
of cadmium (Cd) and selenium (Se) on their accumulation in three rice
cultivars, which remains unclear. The results showed that Se reduced
Cd-induced growth inhibition, and increased and decreased Se and Cd
concentrations in brown rice, respectively. Cadmium concentrations
in all tissues of the hybrid were similar to those in its male parent
yet significantly lower than those in its female parent. Selenium
reduced Cd accumulation in rice when Cd concentration exceeded 2.0
mg kg<sup>–1</sup>; however Se accumulation depended on the
levels of Cd exposure. Finally, Cd had minimal effect on Se translocation
within the three cultivars. We concluded that Cd concentration in
brown rice is a heritable trait, making crossbreeding a feasible method
for cultivating high-yield, low-Cd rice cultivars. Selenium effectively
decreased the toxicity and accumulation of Cd, and Cd affected Se
uptake but not translocation