南方农业学报2017，Vol.48Issue(4)：609-615,7.DOI:10.3969/j.issn.2095-1191.2017.04.007
不同施氮量对花后高温春小麦叶绿素含量及荧光特性的影响
Effects of different nitrogen application rates on chlorophyll content and fluorescence characteristics of spring wheat under high temperature after anthesis
摘要
Abstract
[Objective]In the present study, effects of different nitrogen application rates on chlorophyll fluorescence characteristics of spring wheat under high temperature after anthesis were investigated , in order to provide guidance for analysis for inner mechanism of nitrogen nutrition regulation of high temperature harm to spring wheat. [Method]Ningchun 4 and Ningchun 47 were used as plant materials. Three nitrogen application rates, 120 kg/ha(N1), 240 kg/ha (N2) and 300 kg/ha(N3), were set and no nitrogen application was treated as control(CK). High temperature treatment during 18-22 d after anthesis on wheat was conducted. Chlorophyll content and fluorescence parameters were measured 7 , 14, 23, 28 and 33 d after anthesis. [Result]Under high temperature stress(23-33 d after anthesis), SPAD values, maxi-mum fluorescence(Fm) and variable fluorescence(Fv) in leaves of Ningchun 4 and Ningchun 47 under three nitrogen app-lication rates increased, but original fluorescence(Fo) declined, which rose Fv/Fo and Fv/Fm and decreased Fo/Fm. The variation ranges of wheats in N1 and N2 treatment were larger than the one in N3 treatment compared with CK. Ab-sorption flux per RC (ABS/RC) , trapped energy flux per RC (TR0/RC) and dissipated energy flux per RC (DI0/RC) in N1 and N2 treatments were significantly higher than those of CK during 23-28 d after anthesis (P<0.05,the same below), and significantly lower than those of CK on day 33 after anthesis. Electron transport flux per RC (ET0/RC) was expressed as N2>N1>N3>CK during 23-33 d after anthesis. [Conclusion]Appropriate application of nitrogen fertilizer can alleviate the damages to structure and function of spring wheat photosynthetic organ caused by high temperature , and improve pho-tosynthetic performance.关键词
春小麦/花后高温/施氮量/叶绿素荧光特性Key words
spring wheat/high temperature after anthesis/nitrogen application rate/chlorophyll fluorescence cha-racteristics分类
农业科技引用本文复制引用
朱荣,慕宇,康建宏,赵晶晶,吴宏亮..不同施氮量对花后高温春小麦叶绿素含量及荧光特性的影响[J].南方农业学报,2017,48(4):609-615,7.基金项目
国家自然科学基金项目(31160255) （31160255）
宁夏大学研究生创新项目(GIP201650) （GIP201650）
