摘要
在施氮(N+)和不施氮(N-)条件下进行盆栽试验,对6种基因型玉米材料在不同发育时期植株地上部(整株不含根)与地下部(根)的生物产量、氮素含量、氮积累量等性状进行了分析.结果表明,植株地上部与地下部的生物产量和氮积累量随生育期变化而不断增加,但积累速率地上部﹥地下部,从拔节-成熟,地上部生物产量和氮积累量分别是地下部的2～5和4～8倍;不同时期氮素含量地上部﹥地下部,且地下部保持基本稳定,而地上部稳中有降;拔节后N+条件下的生物产量、氮素含量和氮积累量高于或显著高于N-,但不同基因型材料对低氮胁迫反应不同,除农大108表现明显杂种优势外,其他5个系中,许178表现最突出,开花-乳熟期的生物产量、氮积累量均居前列,高于或显著高于其他自交系;拔节后,材料间生物产量、氮积累量虽呈递增态势,但增幅不一,开花后的变异系数为拔节期的2～3倍,且N-处理的变异系数﹥N+的,地下部的变异系数﹥地上部的,地下部的最大变异系数在开花期,早于地上部(乳熟期-成熟期),因此促根管理措施宜早;在N-条件下,农大108、许178和L2各期仍具有较高的生物产量,证明其对低氮胁迫不敏感,具有氮高效利用特性.
In this investigation, the biomass, nitrogen content, nitrogen accumulation of plant aboveground （whole plant excluding root,WP） and belowground （root） at different developing stages were analyzed under nitrogen applied （N ＋ ） and no nitrogen applied （N - ） conditions by means of pot cultivation in the field. The results showed that the biomass and nitrogen accumulation of WP and root increased with growth but at different speeds, and from jointing to maturity stage, the WP biomass and nitrogen accumulation were 2 - 5 and 4 - 8 times of root, respectively. The mean nitrogen content of WP was higher than that of root but the mean nitrogen content of WP tends to be lightly decreased while that of root maintained stable over stages. The biomass, nitrogen content and nitrogen accumula- tion were higher or much higher under N ＋ than N - condition after jointing stage, but the response to low nitrogen stress varied with materials, except the hybrid Nongda 108 appearing obvious heterosis,the inbred line Xu 178 was higher or significantly higher in biomass, nitrogen accumulation in flower- ing and milk stages than the other inbred lines. The increasing range varied with genotypes, and the coefficient of variations（CV） at flowering stages was 2 -3 times higher than that of jointing stage, es- pecially under N - condition and in root, the max CV of root appeared at flowering stage, earlier than that of WP（ milk-maturity stage） , so the management to promote root system should be earlier. Nongda 108, Xu 178 and L2 had higher biomass than other materials under N - condition, which indicated that they had higher nitrogen use efficiency, and were insensitive to low nitrogen stress.
出处
《河南农业大学学报》
CAS
CSCD
北大核心
2012年第4期353-358,共6页
Journal of Henan Agricultural University
基金
国家自然科学基金项目(30871537)
国家"863"计划项目(2006AA100103)
河南省重点科技攻关项目(082102140021)
关键词
玉米
基因型
低氮胁迫
氮素吸收
氮素分配
maize
genotype
low nitrogen stress
nitrogen absorption
nitrogen distribution
作者简介
卫晓轶，1984年生，女，河南宜阳人，助理研究员，博士，主要从事玉米遗传育种研究．
通讯作者：刘宗华，1960年生，男，河南三门峡人，教授，博士生导师．
