In order to clarify the characteristics of nitrogen efficiency differences among different maize inbred lines, select excellent nitrogen efficient germplasm, improve the nitrogen use efficiency of maize, and lay the foundation for the research of maize nitrogen efficient breeding. Average yield and nitrogen efficiency as the evaluation index, and combined with second level traits such as tasselling stage, anthesis stage, maturity stage, plant height, ear position to calculate correlation among traits and investigate the nitrogen use efficiency of 25 maize inbred lines, which were core germplasm or self-breeding maize inbred line materials used in Huanghuaihai. Correlation analysis results showed that ASI and average yield were extremely significantly positively correlated to nitrogen efficiency in two treatments. Plant height was significantly correlated to nitrogen efficiency in low nitrogen and extremely significantly positively correlated in high nitrogen conditions. The three traits could be used as indicators for evaluating the nitrogen efficiency of maize inbred lines. The results of analysis of variance showed that the ASI, average yield and plant height were significantly difference in genotype and nitrogen supply environment under low and high nitrogen conditions. Based on analyzing the average yield, ASI and plant height of maize inbred lines under high and low nitrogen conditions, three maize inbred lines such as Zheng 58, WK858 and 9058 were identified as donor parents improving the nitrogen use efficiency of maize. This study enriched the nitrogen-efficient germplasm resources, evaluated the nitrogen use efficiency of different maize materials, revealed the degree of response of different materials to nitrogen, provided materials for nitrogen-efficient breeding and theoretical basis and technical support for inbred lines selection and fertilizers rational utilization.
Nitrogen use efficiency,
AN Hongzhou, GAO Zengyu, LI Kuiying, HE Jianhan, WU Yuhua, ZHANG Quanguo. Analysis of Related Traits of Nitrogen Use Efficiency in Maize Inbred Lines of Huanghuaihai[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(S1): 240-245. doi: 10.7668/hbnxb.20191990.