摘要
以续随子为材料采用温室盆栽法,研究了14 d NaCl胁迫处理对其幼苗生长、光合作用和叶绿素荧光特性的影响。结果表明:①续随子幼苗的鲜重和干重在25 mmol.L-1NaCl胁迫时与对照无显著差异,但其随着NaCl浓度的继续增加均显著降低。②NaCl胁迫下,续随子幼苗叶片净光合速率(Pn)降低,胞间二氧化碳(Ci)浓度增大;随着NaCl浓度增加,Pn和Ci较对照的变化幅度增加。③NaCl胁迫下,续随子幼苗叶片的初始荧光(Fo)、最大荧光(Fm)、可变荧光(Fv)、恒态荧光(Fs)、恒态荧光与初始荧光差值(△Fo)、PSⅡ实际光化学效率(ФPSⅡ)及幼苗叶片光化学荧光猝灭系数(qP)均降低;在0～25 mmol.L-1NaCl胁迫下,幼苗叶片各荧光参数比对照略有下降。可见,NaCl胁迫下,续随子产生了光合作用的光抑制伤害。低浓度下,植株能够较多地将光能用于光化学反应,光抑制程度较低,保持了较高的净光合速率,最终明显减轻盐胁迫对植株生长的影响。
Pot experiments were carried out to study the effects of NaCl stress on the characteristics of photosynthesis and chlorophyll fluorescence in Euphorbia lathyris.L.Eight different concentrations of NaCl were applied： 0,25,50,75,100,150,200,250 mmol·L-1.The results showed as follows ： the plant fresh weights and dry wheights of seedlings had no difference with the control when the concentration of NaCl was 25mmol·L-1,but decreased with increasing NaCl concentration when the NaCl concentration was above 25 mmol·L-1.With increasing NaCl concentration,net photosynthetic rate（Pn） decreased,intracellular CO2（Ci） increased,and the magnitude of changes of Pn and Ci compared with the control increased with increasing NaCl concentration.Minimal fluorescence（Fo）,maximum fluorescence（Fm）,variable fluorescence（Fv）,stable fluorescence（Fs）,difference between Fs and Fo（△Fo）,ФPSⅡand photochemical quench（qP） of seedlings all decreased when stressed by NaCl.And at low concentrations NaCl（0-25 mmol·L-1） stress,the fluorescence parameters changed slightly.So Euphorbia lathyris L.was injured by photo-inhibition on NaCl stress,and at low concentrations,plant applied more light energy to photochemical reaction to maintain a high net photosynthetic rate,the degree of photo-inhibition was lower,therefore,NaCl stress had little effect on growth.
出处
《西南农业学报》
CSCD
北大核心
2012年第5期1642-1646,共5页
Southwest China Journal of Agricultural Sciences
基金
江苏省农业科技自主创新资金[CX(10)219]
公益性行业(农业)科研专项经费项目(200903001)
江苏沿海地区农业科学研究所基金(YHS201005)
关键词
叶绿素荧光
NACL胁迫
光合作用
续随子
盐土农业
Chlorophyll fluorescence
NaCl stress
Photosynthesis
Euphorbia lathyris.L.
Salty-soil agriculture
