Abstract
Arsenic (As) is an environmentally hazardous toxic metalloid. To evaluate As tolerance and assimilation capacity, seedlings of jute (Corchorus capsularis L. var. BJC-7370 and CVE-3), kenaf (Hibiscus cannabinus L. var. HC-95 and HC-3) and mesta (Hibiscus sabdariffa L. var. Samu-93) were grown for 25 days in hydroponic nutrient solution containing four levels of As viz 0, 5, 10 and 15 mg L-1 with four replications. Results were showed that the seedlings of jute, kenaf and mesta were highly potential to tolerate As toxicity. Arsenic had no significant effects on survibility of kenaf, mesta and jute seedlings (var.VE-3). Root and shoot length and dry biomass were decreased with the increasing levels of As. Values of bio-concentration factor indicated the varieties of kenaf, mesta and jute (var.VE-3) were As accumulator. Arsenic accumulation was higher in root than shoot and translocation factor indicated that As is slowly translocated from root to shoot. The rate of translocation is increased with the increasing concentration of As in solution. Highest As contents in shoot (3636.10 mg kg-1) and root (6350.38 mg kg-1) were detected from kenaf HC-3. The highest amount (16.05 mg As pot-1) of As accumulation was also calculated from the variety of kenaf HC-3 with the addition of 45 mg As pot-1. The order of As tolerance and absorption potentiality were kenaf HC-3>mesta Samu-93>jute CVE- 3>kenaf HC-95>jute BJC-7370. These varieties are good cultivar for cultivation and/or phytoremediation of As contaminated environment.
Highlights
Arsenic (As) is a toxic metalloid which is not biologically essential element
From this point of view, we are trying to evaluate As tolerance and absorption potentiality by different fibrous crop varieties of jute, kenaf and mesta in hydroponic nutrient solution containing different levels of As
The application of As up to 15 mg L-1 had no significant effect on the seedling survibility of kenaf HC-95, kenaf HC-3, mesta -samu93 and jute CVE-3 varieties, but the seedlings of jute BJC-7370 were affected
Summary
Arsenic (As) is a toxic metalloid which is not biologically essential element. Among the toxic metalloids it is one of the catastrophes for environmental and health hazards affecting 35-77 million people or 21-48% of total population in Bangladesh (Rahman et al, 2018). Potential application of non-edible crop species (like different fibrous crop varieties) for remediation or absorption or assimilation of toxic contaminants (like As) in the field level which will be adopted by the farmers by increasing their income and as environmental decontamination technology. From this point of view, we are trying to evaluate As tolerance and absorption potentiality by different fibrous crop varieties of jute, kenaf and mesta in hydroponic nutrient solution containing different levels of As
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