Effect of nitrate supply on root growth of maize inbred line Zheng 58.

Recently,the effect of NO3 availability on maize root morphology is a research hotspot.To understand the response of maize root morphology to changes in nitrate concentration,this paper used maize inbred line Zheng 58 as material,and analyzed the effect of changes in nitrate concentration within a short time,and partial NO3 treatment on seedling root characteristics,plant biomass,root / shoot ratio and total N content of plants.The results showed that treatment of high concentration of N(10 mmol / L) for a short time could promote main root elongation and inhibit lateral root germination.Treatment of low N concentration(0.04 mmol / L) could promote lateral root growth and dry matter accumulation in root system,and increased root / shoot ratio.Moreover,N deficiency and partial N supply inhibited lateral root elongation.The effect of plant biomass and total N content on lateral root growth showed there were correlation between plant dry weight and lateral root length and between total N content and lateral root density.Root system characteristics phenotype data and quantitative index analysis showed that changes of nitrate concentration in environment would firstly cause the change in growth of Zheng58's lateral root.