title: [Effects of low nitrogen stress on source-sink characters and grain-filling traits of different genotypes summer maize].
abstract: This paper studied the source-sink characters and grain-filling traits of six genotype summer maize varieties under 2 years (from 2007 to 2008) application of low dosage (105 kg x hm(-2)) and normal dosage (337.5 kg x hm(-2)) fertilizer nitrogen. Under low nitrogen stress, the population yield, leaf area index (LAI), source-sink characters, and grain-filling traits of test varieties differed significantly. The varieties tolerant to low nitrogen, e.g., Xianyu 335 and Zhengdan 958, had longer active grain-filling stage, higher maximum filling rate, longer duration of maximum LAI, and more harmonious sink-source relation; while less tolerant species, e.g., Shaandan 902 and Yuyu 22, had shorter active grain-filling hours, lower maximum filling rate, lower mass increment and LAI under maximum grain-filling rate after silking, and significantly decreased source supply capacity. Low nitrogen stress increased the yield difference among the test varieties significantly.
authors: College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China. lhd2042@yahoo.com.cn
authors: Hai-dong
authors: HD
authors: Lu
authors: Ji-quan
authors: JQ
authors: Xue
authors: Guo-sheng
authors: GS
authors: Ma
authors: Ren-he
authors: RH
authors: Zhang
authors: Xing-hua
authors: XH
authors: Zhang
mesh_terms: D018533:Biomass; D002681:China; D002523:Edible Grain / Q000254:growth & development*; D005308:Fertilizers; D005838:Genotype; D009584:Nitrogen / Q000032:analysis*; D012621:Seasons; D013312:Stress, Physiological; D003313:Zea mays / Q000235:genetics* / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D009584:Nitrogen