An experiment was conducted to reduce the entrance of arsenic on rice plant. Experiment consisted three different density of the trap plants viz. P1: No P. vittata (control); P2: four P. vittata plant per m 2 and P3: eight P. vittata plant per m 2. Inter planting of four P. vittata per m 2 reduced 96.24 % and eight P. vittata per m 2 reduced 97.01% arsenic accumulation into rice. Maximum yield was found from P2 (34.2 g per plant) which was statistically similar with P3 (32.9 g per plant) while minimum was found from P1 (30.0 g per plant). Highest amount of arsenic accumulation was found from P1 in rice grain (1.55 ppm), husk (5.57 ppm) and straw (39.78 ppm). Arsenic accumulation was found in rice grain (0.02 ppm in both P2 and P3), husk (0.60 and 0.58 ppm in P2 and P3 respectively) and straw (1.05 and 1.00 ppm in both P2 and P3 respectively). Concerning both yield of rice and arsenic concentrations in rice plant, it can be recommended to interplant four P. vittata plant per m 2 area as a trap plant to reduce arsenic entrance into rice plant from soil which can keep away of arsenic pollution in food chain.
The rhizosphere soil has a large and various number of microorganisms especially the bacteria. This experiment was conducted at the department of Botany, Jahangirnagar University, Savar, to investigate the rhizospheric and non-rhizospheric bacteria from arsenic contaminated soil. Pteris vittata was treated with different concentrations of arsenic ranges from 5000 to 10000 ppm in the pot. The experimental result indicated that the negative correlation between arsenic concentration and rhizospheric soil bacteria. Highest number of bacteria (8.6×108 cfu/g) were found in rhizospheric soil (control), while lowest numbers of bacteria (4.0×107 cfu/g) were found in the non-rhizospheric soil with 10000 ppm arsenic. Thirty bacteria were isolated from rhizospheric and non-rhizospheric soil samples. Out of thirty samples Bacillus and Pseudomonas were selected on the basis of morphological and biochemical nature. The present study concluded that the arsenic has an adverse effect on the growth of rhizospheric soil bacteria.
Jahangirnagar University J. Biol. Sci. 8(1): 9-15, 2019 (June)
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