Khan Shahid, Amaral Júnior Antônio Teixeira do, Ferreira Fernando Rafael Alves, Kamphorst Samuel Henrique, Gonçalves Gabriel Moreno Bernardo, Simone Mendonça Freitas Marta, Silveira Vanildo, Apolinário de Souza Filho Gonçalo, Francisco Teixeira do Amaral José, Enrique Bresssan Smith Ricardo, Hussain Khalil Iftikhar, Maganha Silva Vivas Janieli, Pequeno de Souza Yure, Alves Peçanha Diego
Laboratory of Plant Breeding and Genetics, Center of Agricultural Science and Technology, Darcy Ribeiro State University of Northern Rio de Janeiro, Av. Alberto Lamego, 2000, Campos dos Goytacazes, RJ 28000-000, Brazil.
Department of Plant Breeding and Genetics, University of Agriculture, Peshawar 25130, Pakistan.
Plants (Basel). 2020 Jul 15;9(7):893. doi: 10.3390/plants9070893.
The extensive use of nitrogen (N) in agriculture has caused negative impacts on the environment and costs. In this context, two pot experiments were performed under different N levels and harvested at different vegetative stages to assess two popcorn inbred lines (P2 and L80) and their hybrid (F1 = P2 × L80) for the N use, uptake and utilization efficiency (with the inclusion and exclusion of root N content); to find the contrasting N levels and vegetative stages that effect nitrogen use efficiency (NUE) and to understand the relationship between the traits related to NUE. The hybrid and P2 were confirmed better than L80 for all the studied traits. NUE is mainly affected by the shoot dry weight, uptake and utilization efficiency. Extremely low and high N levels were found to be more discriminating for N use and dry weight, respectively. At the V6 (six fully expanded leaf) stage, root N content (RNC) should be considered; in contrast, at the VT (tasseling stage) stage, RNC should not be considered for the uptake and utilization efficiency. The genetic parameter performance for N use, uptake, shoot dry weight and N content could favor the achievement of the genetic gain in advanced segregating generations.
农业中大量使用氮（N）已对环境和成本造成负面影响。在此背景下，进行了两项盆栽试验，设置不同氮水平，并在不同营养阶段收获，以评估两个爆米花自交系（P2和L80）及其杂交种（F1 = P2 × L80）的氮利用、吸收和利用效率（包括和排除根系氮含量）；找出影响氮利用效率（NUE）的对比氮水平和营养阶段，并了解与NUE相关性状之间的关系。对于所有研究性状，杂交种和P2均被证实优于L80。NUE主要受地上部干重、吸收和利用效率的影响。极低和高氮水平分别对氮利用和干重更具区分性。在V6（六片完全展开叶）阶段，应考虑根系氮含量（RNC）；相反，在VT（抽雄期）阶段，在吸收和利用效率方面不应考虑RNC。氮利用、吸收、地上部干重和氮含量的遗传参数表现可能有利于在高级分离世代实现遗传增益。
