Arsenic uptake and translocation in rice varieties differing in grain as accumulation
2016
Mussawar, H.A.
Rice is the principal nutrition food for approximately 50% of the world people. As is widespread environmental contaminant and its toxicity causes chronic and epidemic impact on human health. A pot experiment was performed on rice for inspect the translocation of As to different rice genotypes for different soil As contents and potential of different rice genotypes to accumulate As in grains. Arsenic was applied @ (0, 10, 20 and 30 mg per kg) to rice genotypes. Sodium arsenate was the source of As. Four Rice genotypes (KS-462, KSK-133, Shaheen and Shaheen-2000) were used for this study. Seeds of rice was germinated in trays containing sand. At two leaves stage seedlings of uniform size was transplanted in pots. Recommended fertilizers were applied. Crop was harvested at maturity stage. The plant growth and yield was significantly decreased as the arsenic stress increased. Plant biomass was decreased 20 to 44%. Chlorophyll contents were also decreased 10 to 26%. Similarly, spikelet per spike was reduced 5 to 15%. Grain yield was also reduced 13 to 50% at arsenic level (10 ppm of arsenic) to (30 ppm arsenic). The different genotypes of rice were different in accumulation of arsenic in their different plant parts. Maximum concentration of arseni9 in roots and shoots was measured in genotype (KSK-133) and minimum arsenic concentration was measure in genotype (KS-462). Arsenic concentration was measured in shoots of different genotypes which was increased by increasing contamination of arsenic. Accumulation of arsenic in grains of different rice genotypes was increased as the arsenic stress was increased. Arsenic concentration was 30 to 70% high in genotype (KSK-133) compared genotype (KS-462).
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