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Title:: Effects of Different Selenium Concentrations on Physiological Characteristics and Selenium Accumulation of Eggplant Seedlings

Author(s):: PAN Shaokun1; LU Ronghai1; XIANG Juan1; LIU Lei1; LIN Lijin2; CHEN Ling1; (1.Institute of Horticultural Research,Chengdu Academy of Agriculture and Forestry Sciences,Chengdu,Sichuan 611130；2.Institute of Pomology and Olericulture,Sichuan Agricultural University,Chengdu,Sichuan 611130)

Abstract:: The pot experiment was conducted to plant the eggplant seedlings in the different concentrations (0,5,10,25,50,75，100 mg·kg-1) of selenium (Se) soil,and the physiological characteristics and Se accumulation of eggplant seedlings were studied.The results showed that with the increase of soil Se concentrations,the roots,stems,leaves and shoots biomass,and the chlorophyll content of eggplant seedlings were significantly decreased,but there were no obvious symptoms of poison,indicating that the eggplant seedlings had a certain tolerance to Se stress.With the increase of soil Se concentrations,the net photosynthetic rate and transpiration rate of eggplant seedlings firstly increased and then decreased,while the intercellular CO2 concentration and stomatal conductance decreased.The superoxide dismutase,peroxidase and catalase activities of eggplant seedlings firstly increased and then decreased with the increase of soil Se concentration,when the soil Se concentration was 5 mg·kg-1,the antioxidase activity of eggplant seedlings reached the maximums.The Se contents in roots and stems of eggplant seedlings were increased with the increase of soil Se concentration,and the Se content in leaves were firstly increased and then decreased (the maximum value appeared in soil Se concentration was 50 mg·kg-1,and its value was 147.26 mg·kg-1).These results indicated that eggplant seedlings had strong tolerance to Se stress,and had higher Se accumulation.