Stability in Agronomic Performance of Maize Inbreds at Different Nitrogen Levels
Low nitrogen is an important abiotic stress in maize that has major impact on production and productivity. Keeping in the increasing concern on low nitrogen stress, it is necessary to identify low nitrogen tolerant germplasm. In view of this, an investigation was carried out at Tamil Nadu Agricultural University, Coimbatore, India, to study the impact of different nitrogen levels on 13 biometrical traits and to understand the stability behavior of 24 maize inbred lines. The experiment was conducted on red loamy soil possessing low soil available nitrogen (154kg/ha). The 24 inbreds replicated twice were applied with three levels of nitrogen viz., 0 (N 0),100 (N1)kg/ha and 200kg/ha (N2) in three split doses. The stability and adaptability of different inbreds were analyzed through AMMI model. Simple correlation between 12 biometrical traits with grain yield per plant at N0 level, showed that eight characters viz., number of grains per row, number of grain rows per cob, plant height at 30 DAS, 100 grain weight, plant height at 80 DAS, grain nitrogen, leaf senescence and SPAD value at 70 DAS were positively associated with grain yield per plant. The mean value of inbreds in three nitrogen environments expressed the influence of low nitrogen (No) on all the characters studied. Plant height at 30 DAS, and 80 DAS, SPAD value at 70 DAS, pollen fertility, number of grain rows per cob, number of grains per row, 100 grain weight, grain nitrogen content and grain yield per plant had lower mean values at N0 level. Days to tasseling, days to silking and anthesis-silking interval were prolonged at NO level. The inbreds UMI 12, UMI 564, UMI 176, UMI 1008, UMI 54, UMI 1007, UMI 919 and UMI 1004 were found promising for grain yield under NO condition. The stability and adaptability of the inbreds to different nitrogen levels explored through AMMI analysis revealed that the inbreds UMI 12, UMI 176 and UMI 54 had maximum additive main effects. The inbreds UMI 1001, UMI 1003, UMI 1005, UMI 1006, UMI 1008, UMI 12, UMI 564, UMI 67, UMI 826, UMI 61 and UMI 4 were identified as stable genotypes across different nitrogen levels.
Ow nitrogen tolerance Maize inbreds AMMI analysis
P. M. Tamilarasi S. Arumugachamy B. Meenakumari P. Malarvizhi
Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore-641003, India Departments of Soil Science & Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
342-345
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）