Response of Different Genotypes of Millet to Low Nitrogen Stress at Maturity
In order to study the physiological mechanisms of low nitrogen tolerance in foxtail millet and explore germplasm resources with efficient utilization of nitrogen,pot experiment was taken with six genotypes of foxtail millet varieties were used as materials.Two treatments of normal nitrogen(120 mg/kg,NN)and no nitrogen(N0)were set to study their effects on leaf photosynthetic performance,nitrogen contents in various nutrient organs,nitrogen allocation ratio,and main nutritional indicators of grains.The results showed that there were significant differences(P<0.05)in biomass,thousand grain weight,grain nitrogen content,plant total nitrogen content,and nitrogen accumulation and allocation ratio in different organs among millet varieties.Compared with other genotypes of foxtail millet in treatment N0,the 1 000-grain weight,and nitrogen alloca-tion ratio,crude fibre and lysine contents in grains of Jigu 17 increased by 11.1～21.6%,3.5%～9.5%,9.7%～18.2%and 0.3%～45.5%,respectively.Compared with treatment N0,the plant total nitrogen and grain nitro-gen contents in different genotypes of foxtail millet increased by 8.8%～20.7%and 2.3%～22.4%respectively in NN treatment.Clustering analysis showed that the varieties of Jigu 17 and Yugu 18 performed better under both normal and no nitrogen treatments,while Changnong 35 was more sensitive to low nitrogen environment.These results could provide theoretical references for breeding and planting of millet varieties with tolerance to low nitrogen.
MilletLow nitrogen stressBiomassNitrogen allocation ratio
万方数据
维普
