[Effects of low nitrogen stress on source-sink characters and grain-filling traits of different genotypes summer maize].
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.
Lu
Hai-dong
HD
College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China. lhd2042@yahoo.com.cn
Xue
Ji-quan
JQ
Ma
Guo-sheng
GS
Zhang
Ren-he
RH
Zhang
Xing-hua
XH
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*
D005308:Fertilizers; D009584:Nitrogen