首页|Potassium alleviated high nitrogen-induced apple growth inhibition by regulating photosynthetic nitrogen allocation and enhancing nitrogen utilization capacity
Potassium alleviated high nitrogen-induced apple growth inhibition by regulating photosynthetic nitrogen allocation and enhancing nitrogen utilization capacity
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There is a close relationship between potassium(K)and nitrogen(N).However,the roles of K under high N conditions remain unclear.Using a hydroponics approach,we monitored the morphological,physiological,and molecular changes in M9T337 apple(Malus domestica)rootstocks under different nitrate(10 and 30 mmol·L-1 NO3-)and K supply(0.5,6,10,and 20 mmol.L-1 K+)conditions.Results revealed that high nitrate inhibited the root growth of M9T337 rootstocks,downregulated the expressions of K transporter genes(MdPT5,MdHKT1,and MdATK1),and reduced the net NO3- and K+ influx at the surface of roots,thereby resulting in an N/K imbalance in rootstocks.Further investigation showed that 10 mmol·L-1 K increased the activity of N metabolic enzymes(NR,GS,NiR,and GOGAT),upregulated the expressions of genes related to nitrate uptake and transport(MdNRT1.1,MdNRT1.2,MdNRT1.5,and MdNRT2.4),promoted 15N transport from the roots to the shoots,optimized leaf N distribution,and improved photosynthetic N utilization efficiency under high nitrate conditions.These results suggest that the negative effects of high nitrate may be related to the N/K imbalance and that reducing N/K in plants by increasing K supply level can effectively alleviate the inhibition of N assimilation by high nitrate stress.
Apple rootstockK levelHigh nitrate stressN metabolism15N
State Key Laboratory of Crop Biology,College of Horticulture Science and Engineering,Shandong Agricultural University,Tai'an,Shandong 271018,China
Key Laboratory of Biochemistry and Molecular Biology in Universities of Shandong,College of Biological and Agricultural Engineering,Weifang University,Weifang,Shandong 261061,China
Special Fund for the National Key R & D Program of Chinaearmarked fund for CARSTaishan Scholar Assistance Program from Shandong Provincial Government
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