Effect of Hg,Cr and Pb Single Pollution to Photosynthesis in Mung Bean

With Jinlu 2 as test material,a pot experiment was conducted to study the effects of treatment of single heavy metal(Hg2+,Cr3+,Pb2+)on the photosynthesis of mung bean in podding period.The result showed,compared with CK,the chlorophyll a,chlorophyll b,chlorophyll a to chlorophyll b,net photosynthesis rate,transpiration rate,stomatal conductance and intercellular CO2 concentration were reduced by different degree with the the increase of concentration of single treatment of Hg2+,Cr3+ and Pb2+.Low concentration Cr3+ and Pb2+ had promoter action on chlorophyll a,chlorophyll b,transpiration rate,stomatal conductance and intercellular CO2 concentration.The inhibited effect of Hg2+ on the photosynthesis of mung bean in podding period was the greatest in three heavy metal.