摘要
以烟草为材料研究了氮素形态(铵态氮和硝态氮)对烟草叶片光合光反应和光合能量分配比例的影响。结果表明,铵态氮(NH4+-N)、硝态氮(NO3--N)和等量比例(m/m,1∶1)铵态氮和硝态氮(简称"等量硝铵比")三种氮素处理对烟草叶片潜在的最大光化学效率(Fv/Fm)影响不大。与NO3--N和等量硝铵比相比较,NH4+-N明显降低了烟草叶片的净光合速率(Pn)、电子传递速率(ETR)、表观量子效率(AQY)、暗呼吸速率(Rd)和实际光化学效率(ΦPSⅡ),类囊体膜两侧质子梯度和叶黄素循环的量子产额(ФNPQ)却明显增加了。铵态氮改变了烟草PSⅡ能量的分配,而硝态氮对其影响较小。
Using tobacco （Nicotiana tabacum L.） as material, the effects of nitrogen forms （ammonium and nitrate nitrogen, NH4＋-N and NO3--N） on light reaction and the energy distribution for photosynthesis in tobacco leaves were investigated. The results showed that the maximal photochemical efficiency（Fv/Fm） in tobacco leaves was little affected in three kinds of nitro- gen forms （ammonium nitrogen, nitrate nitrogen and equivalent ratio of ammonium and nitrate nitrogen）. NH4＋-N reduced the net photosynthetic rate（Pn）, electron transport rate （ETR）, apparent quantum yield（AQY）, dark respiration rate（Rd） and ac- tual photochemical efficiency （ФPsⅡ） compared with NO3--N and equivalent ratio of ammonium and nitrate nitrogen. NH4＋-N increased portion of apparent quantum yield on the thylakoid membranes （ФNPQ）. Proportion of energy distribution for photosyn- thesis in tobacco leaves was changed by NH4＋-N, and not by NOf-N.
出处
《湖北农业科学》
北大核心
2014年第15期3520-3525,共6页
Hubei Agricultural Sciences
基金
国家自然科学基金项目(31070307
30771746)
关键词
氮素形态
电子传递
叶绿素荧光技术
烟草叶片
nitrogen form
electron transport
chlorophyll fluorescence technique
Nicotiana tabacum L. leaves
