摘要
本文用溶液培养的方法,研究了光照(200μmol/m2.s、400μmol/m2.s)及N浓度(0.4mmol/L、4 mmol/L)对不同氮效率玉米自交系(478、Baici)生长及N素吸收的影响。结果表明:提高光照强度有助于光合产物向根系的运输,表现为根冠比、平均根轴长、根体积、根系吸氮量显著增加,光照与N水平对根系的生长及氮素吸收的影响存在着正的交互作用。高光强高N水平对茎叶生长的促进作用大于根系,而高光强低N水平对根系生长的促进作用大于茎叶。从品种的变化来看,在N素胁迫下,提高光照强度能够显著促进氮高效品种478根系的生长,提高了该品种对氮素胁迫的适应能力,能够在低氮下获取更多的氮素,而高光强高N下,两个品种对氮素吸收的差异变小。
The paper studied on the effects of light intensities（200μ mol/m2·s,400μ mol/m2·s） and N concentration（0.4m mol/L,4 m mol/L）on the growth and N uptake of different N efficiency maize varieties by culture solution.The results showed that the growth and N uptake of the two lines were promoted by increasing light intensity especially for root.Therefore,more carbohydrates were allocated a large proportion to root than shoot and the root shoot ratio,root average length of axis,root volume and root N uptake were increased greatly by increasing light intensity.There existed a positive interaction for root growth and N uptake between light and N level.The promoted effect for shoot growth was higher than root at high light and N is supply,on the other hand the enhanced effect for root growth was higher than shoot at low N supply and high light intensity.As for the genetic difference of the two maize varieties,it could greatly enhance the root growth of 478 at low N supply and high light intensity,that enable the variety to obtain more N at N stress condition.Whereas,there had little significant genetic different on N uptake at high light intensity and N supply.
出处
《农业现代化研究》
CSCD
北大核心
2011年第4期479-482,共4页
Research of Agricultural Modernization
基金
山西科技攻关计划培育项目"植物源杀菌缓释肥料的研制及作用机理"(编号:06YFGPNC03100)
关键词
玉米
光照强度
氮浓度
生长
氮素吸收
maize
light intensity
N concentration
growth
N uptake
