Abstract: The differences in nitrogen(N) uptake and utilization of different potato varieties at seedling stage in Northeast China were evaluated,and potato genotypes with high responsiveness to N were screened to provide a theoretical basis for the selection and mechanism study of potato N efficient genotypes. Pot experiment was used to compare the differences in the ability of different genotypes of potato to obtain N at the seedling stage under the three levels of N supply and their causes. The results showed that different N supply levels had significant differences in the ability of different genotypes to auumulate N. With the increased of N supply levels,the N accumulation of four potato varieties such as Dongnong 310,Yanshu 4,Kexin 13 and Kexin 22 increased significantly. The response rate was high,while the N accumulation of seven potato varieties such as Dongnong 308,Dongnong 311,Dongnong 312,Dongnong 316,Yanshu 9,Yanshu 7 and Kexin 19 had no significant increase,and the response to N was low. For the genotypes with high nitrogen responsiveness,the Nitrate reductase active(NRA),Glutamine synthetase active(GSA),and root activity a little bit increased significantly with increasing N supply levels,while the chlorophyll(SPAD)values increased less. The increase in N accumulation,NRA,GSA,root activity,and SPAD values were significantly greater than those with low N response. The correlations between N accumulation and NRA,GSA,SPAD,and root activity of potato under low N and high N conditions were analyzed. NRA and GSA activity could better reflect the N accumulation ability of potato during seedling stage,the ratio of SPAD and root activity. The reliability is better,and the strength of NRA and GSA activity can be used as an important indicator for evaluating the N uptake accumulation of potato seedlings.

Key words: Potato, N accumulation, Response degree

CLC Number: 

• S143.1

• S532.03