| A hydroponic experiment under greenhouse condition with five leafy vegetable species including romaine（Lactuce sativa var. longifolia）, lettuce（Lactuce sativa L.）, Celery（Apium graveolens L.）, amaranth（Amaranthus mangostanus L.） and water spinach（Ipomea aquatica L.） was conducted to compare the properties of arsenic（As） uptake in As contaminated farmland. The results showed that the shoot biomass（FW） of celery, amaranth, and water spinach was significantly（P<0.05） lower, when the As concentration in the nutrient solution was with 2, 4, and 8 mg·L-1, while As addition did not have significant effects on the shoot biomass of romaine and lettuce under all the As treatments used compared to the control. It indicated that romaine and lettuce had higher As tolerance. When the arsenic in nutrient solution reached up to 10 mg·L-1, water spinach had the highest shoot As accumulation with 1623 μg·pot-1 and lettuce had the lowest shoot As accumulation with 45.58 μg·pot-1. As accumulation in shoot of five species was ranked from high to low in the order of spinach, celery, amaranth, lettuce and romaine. Under the different As concentrations in the nutrient solution, the translocation factor（TFs） for lettuce and romaine is with 0.02 and 0.03 respectively, while the BFs（ratio between As concentration in shoot and As in nutrient） for lettuce and romaine is with 2.75 and 2.66 respectively. Both of TFs and BFs in lettuce and romaine is lower than in other vegetables. The results could provide an effective basis for screening of low As uptake crops under hydroponic experiments. |
