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《Acta Botanica Boreali-Occidentalia Sinica》 2017-07
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Response of Leaf Physiological Indexes to Short-term Salinity Stress for Seedlings of Sonchus oleraceus L.

JIA Pengyan;TIAN Fuping;LIU Yifan;LIU Yu;WU Gaolin;HU Yu;LU Yuan;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University;Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS/The Lanzhou Scientific Observation and Experiment Field Station of Ministry of Agriculture for Ecological System in the Loess Plateau;College of Forestry,Northwest A&F University;  
In order to evaluate the responses of physiological indexes of Sonchus oleraceus to short-term salt stress and provide theoretical instructions to the further research of salt tolerance and tolerance mechanism for wild plants,we irrigated S.oleraceus seedings with Hoagland's nutrient solution containing NaCl at various concentrations[0(control),66,133,200,250,300 mmol·L~(-1)].After 1,2and 3day of salt treatments,the leaves of plants were harvested,Na~+,K~+,malondialdehyde(MDA),soluble sugar,soluble protein,free proline contents and superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT)activities were measured.The results showed that:(1)after 1,2day of 66~200 mmol·L~(-1)NaCl,the changes of Na~+content were not obvious.K~+content and K~+/Na~+ratio significantly increased with salinity compared with CK and reached to the maximun at 200mmol·L~(-1) NaCl.After 3day of salt treatment,the changes of K~+content had the similar tendency with 1day and 2day treatments.Na~+content significantly increased with salinity.K~+/Na~+ratio significantly decreased with salinity except at 66mmol·L~(-1) NaCl.(2)Soluble sugar,soluble protein and proline contents increased,then decreased with salinity after 1-3day of salt stress.At 200mmol·L~(-1) NaCl,soluble protein content reached to the maximun after 1day and 2day salt stress and soluble sugar content reached to the maximun after 2day and 3day salt stress.Free proline had the similar tendency after 1day and 2day salt stress and significantly increased compared with CK with salinity after 3day salt stress.(3)The activities of SOD,POD and CAT increased then decreased with salinity after 1~3day salt stress.All of them reached to the maximun at 250mmol·L~(-1) NaCl and were much higher than CK at all levels of salinity after 1day and 2day salt stress.The activities of SOD and POD reached to the maximun at 200 mmol·L~(-1) NaCl after 3day salt stress,during which CAT activity reached to the maximun at 250mmol·L~(-1) NaCl and were much higher than CK except at 250 and 300mmol·L~(-1) NaCl.It was demonstrated that S.oleraceus was very salt tolerant and could tolerance 66-300mmol·L~(-1) NaCl,as judged from the higher ability to absorb K~+and reject Na~+as well as the higher osmoregulation and antioxidant capacity,almost relieving the toxicity of Na~+and osmotic stress.But,the osmoregulation and antioxidant capacity decrease when NaCl concentration exceed200mmol·L~(-1).
【Fund】: 国家自然科学基金(31372368);; 中国农业科学院创新工程专项资金(CAAS-ASTIP-2014-LIHPS-08);; 中国科学院“西部之光”项目(XAB2015A04);中国科学院青年创新促进会(2011288)
【CateGory Index】: Q945.78;S636.9
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