低氮胁迫对不同基因型玉米根部性状的影响

By using pot cultivation,an elite hybrid Nongda 108 and its parents as well as its three F2:4 family lines were grown under nitrogen applied(N+) and no N applied(N-) conditions to analyze the root traits of maize with variance genotypes on different stages.The results showed that significant or highly significant differences existed in the 4 root traits among genotypes at elongation stage,flowering stage and grain filling stage.Beside for the hybrid Nongda108 appearing obviously heterosis,the inbred line Xu178 was higher or significant higher in the 4 root traits than any other lines which ranked unstably in the root traits over stages,such as the line 2 was the poorest in root activity among the 5 lines,but its root volume was more larger,only smaller than that of Xu178,also the inbreed line Huang C was small in root volume but with more main root numbers.Obviously,keeping co-regulation among the root traits was the key for Xu178 to maintain excellence.The root traits appeared more higher over the 3 stages under N+ than N-condition,while the increasing rate varied with genotypes,Nongda108 and Xu178 with little increasing rates which referred that Xu178 was insensitive to low nitrogen stress,and was a high nitrogen using efficiency genotype under low nitrogen condition and also which was the genetic basis for Nongda108 to be a high nitrogen using efficiency hybrid.

Effects of Low Nitrogen Stress on the Root Traits of Different Genotypes in Maize