植物营养与肥料学报2017，Vol.23Issue(4)：1104-1111,8.DOI:10.11674/zwyf.16305
油菜NO3-的吸收、分配及氮利用效率对低氮胁迫的响应
Response of NO3-uptake and distribution and nitrogen use efficiency in oilseed rape to limited nitrogen stress
摘要
Abstract
[Objectives] This research was conducted in order to investigate response of NO3-uptake and distribution to limited nitrogen (N) stress and its influence on nitrogen use efficiency (NUE) in oilseed rape,and supply scientific basis for understanding the physiological and NUE changes under limited-N stress condition.[Methods] Oilseed rape genotype 814 was used as plant materials,and sand culture experiment was conducted under normal-N (10 mmol/L) and limited-N (3 mmol/L,1 mmol/L) levels.The response of root characteristics,transpiration,NO3 distribution and assimilation to limited-N stress and its influence on NO3-uptake efficiency and NUE were studied.[Results] Compared with the normal-N level,NO3-content,total N,root biomass and root uptake area were decreased significantly under limited-N level (3 mmol/L,1 mmol/L),but ratio of (NO3) shoot/root and (total N) shoot/root,ratio of root biomass/shoot biomass were increased significantly.Stomatal conductance and transpiration rate were increased significantly in oilseed rape under limited-N stress,which not only stimulated NO3-uptake,but also higher proportion of NO3 distributed from root to shoot;meanwhile,water use efficiency was decreased significantly.There were no significant differences of NR and GS in root and shoot between normal-N and limited-N treatments,chlorophyll content and photosynthesis were decreased significantly,but photosynthetic NUE was increased significantly.[Conclusions] Total N and biomass of oilseed rape plants were decreased significantly under limited-N stress,but the NUE was increased significantly,which is result from the higher proportion of NO3-distributed from root to shoot and higher photosynthetic NUE under limited-N stress.关键词
油菜/NO3-/氮素吸收效率/氮素利用效率Key words
oilseed rape/nitrate/N uptake efficiency/N use efficiency引用本文复制引用
荣楠,韩永亮,荣湘民,宋海星,彭建伟,谢桂先,张玉平,张振华..油菜NO3-的吸收、分配及氮利用效率对低氮胁迫的响应[J].植物营养与肥料学报,2017,23(4):1104-1111,8.基金项目
土壤与农业可持续发展国家重点实验室开放课题(Y20160015) （Y20160015）
湖南农业大学大学生科技创新基金(2016ZK13) （2016ZK13）
湖南农业大学青年科学基金(16QN35)资助. （16QN35）
