Evaluation of Nitrogen Efficient Cultivars of Foxtail Millet and Analysis of the Related Characters at Seedling Stage
Objective]The objective of this experiment was to probe genetic variation of nitrogen uptake efficiency (NupE) and nitrogen utilization efficiency (NutE) of foxtail millet cultivars at seedling stage and screen N efficient cultivars, which could provide a theoretical basis for the development of new N efficient varieties and N efficient mechanism study.[Method]In this study, a sand culture pot experiment was conducted with 79 foxtail millet cultivars from three typically ecological types, shoot biomass, nitrogen concentration, nitrogen content, NutE and NupE were assessed under low nitrogen (0.2 mmol·L-1) and high nitrogen (6 mmol·L-1) supply, nitrogen use efficiency (NUE) types were also classified.[Result]Large genetic variation was observed in shoot biomass, shoot N concentration, shoot N content, NupE, NutE and NUE at seedling stage. Among the three ecological types, northwest spring foxtail millet cultivars had the highest genetic variation of NupE, followed by north summer and northeast spring foxtail millet cultivars, while the genotypic variation of NutE in north summer type was more than that in northwest and northeast spring foxtail millet cultivars. Shoot biomass was significantly and positively correlated with NupE and NutE (P<0.01), and correlation coefficients wereR2N0.2=0.1827?? andR2N6=0.1027??,R2N0.2=0.8985??andR2N6=0.9442??, respectively. NUE was significantly and positively correlated with nitrogen content and negatively correlated with nitrogen concentration, and correlation coefficients were R2N0.2=0.8985??andR2N6=0.9442??,R2N0.2=0.1962?? andR2N6=0.0998??, respectively. NupE was negatively correlated with nitrogen concentration, and the correlation coefficients were R2N0.2=0.9924?? andR2N6=0.9910??. There was no significant correlation between NupE and nitrogen concentration, and between NupE and NutE. According to means of shoot biomass and NUE of 79 foxtail millet cultivars, foxtail millet cultivars from three ecological regions were classified into four types, respectively, both higher than the average under low nitrogen and high nitrogen level (HLHH), both lower than the average under low nitrogen and high nitrogen level (LLLH), higher than the average under low nitrogen and lower than the average under high nitrogen level (HLLH), and lower than the average under low nitrogen and higher than the average under high nitrogen level (LLHH). HLHH and LLHH types were dominant cultivar types in northeast spring foxtail millet, and the percentage of LLLH types was the lowest in northeast spring foxtail millet (PNW17.6%<PNS32.4%<PNE36.0%). However, HLLH types were the main cultivar types in northwest spring foxtail millet (PNW24.0%>PNS18.9%>PNE5.9%).[Conclusion]There was a significant NUE genetic variation of seedlings in different foxtail millet cultivars. Genetic variation of NupE was the highest in northwest spring foxtail millet cultivars, and north summer foxtail millet cultivars had the highest genetic variation of NutE. There was no significant correlation between NupE and NutE, indicating that the evaluation and improvement of N uptake and utilization should be undertaken independently.
国家科技期刊平台
NSTL
万方数据
维普
