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《Grassland and Turf》 2015-05
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Effects of nitrogen supplyon photosynthetic pigments and photosynthetic characteristics in two varieties of alfalfa

HAO Feng;LIU Xiao-jing;ZHANG Xiao-ling;College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S.Centers for Grazingland Ecosystem Sustainability;  
Under the condition of complete nutrient solution,the effect of 5nitrogen levels(0,105,210,315 and 420mg/L)on photosynthetic pigments and photosynthetic characteristics of Medicago sativa cv.Gannong No.3and M.sativacv.Longdong was studied through sand culture method.The results showed that the photosynthetic rate,stomatal conductance,leaf area and chlorophyll content under nitrogen treatment were significantly higher than CK(P0.05),and they increased at beginning and then decreased with the increase of nitrogen level(reached the highest while nitrogen level was 210 mg/L).The intracellular CO2 concentration decreased along with increasing nitrogen level.Treatment N210 performed the best photosynthetic efficiency.The response sensitivity of two varieties was the highest under treatment N210,and the photosynthetic rate,stomatal conductance and chlorophyll content of Gannong No.3was higher than Longdong,in contrast,the leaf area and intracellular CO2 concentration of Longdong were higher than Gannong No.3.
【Fund】: 国家自然科学基金(31460622);; 甘肃省财政厅项目“外源氮素供应对紫花苜蓿产量和品质形成影响研究”资助
【CateGory Index】: S541.9
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