长白山三种橐吾光适应性的初步研究

以长白山蹄叶橐吾、复序橐吾、狭苞橐吾为试材,对其不同遮荫条件下的形态指标、叶绿素含量、光合形态指标及叶绿素荧光参数等进行测定,并根据其叶绿素含量、光合速率和叶绿素荧光参数来探讨3种橐吾的耐荫性。结果表明:在50%遮荫下的狭苞橐吾、复序橐吾和在70%遮荫的蹄叶橐吾,其形态、叶绿素含量、净光合速率、日均净光合速率、原初光能转化效率(Fv/Fm)和光化学淬灭系数(qP)达最大,叶绿素a/b值最低,但非光化学淬灭系数(NPQ)随遮荫度增加而降低。因此,狭苞橐吾和复序橐吾适宜生长在50%遮荫环境下,蹄叶橐吾适宜生在70%遮荫环境下;3种橐吾品种为耐荫性植物,其中蹄叶橐吾耐荫性最高,狭苞橐吾和复序橐吾次之。

Study on Light-adapted of Variations of Three Ligularia Cass in Long White

Taking L.fischeri,L.jaluensis Kom,L.intermedia Nakai as material,morphological indexes and the pigment content,net photosynthetic rate,and chlorophyll fluorescence of leaf under different shading treatments(0%,50%,70%) were investigated.The results showed that the pigment content,net photosynthetic rate,photosynthetic rate of dailyaverage,conversion efficiencyof primary light energy(Fv/Fm) of PSⅡ and photochemical quenching coefficient(qP) were enhanced of treatments with shading degree at 50% of L.jaluensis Kom and L.intermedia Nakai and 70% shading treatments of L.fischeri,but the non-photochemical quenching coefficient(NPQ) was decreased behind shading.Conclusion that L.jaluensis Kom.and L.intermedia Nakai could adapt to treatments with shading degree at 50%,L.fischeri could adapt to treatments with shading degree at 70%,three variations of Ligularia Cass of shade plant,L.fischeri No.1,L.jaluensis Kom.and L.intermedia Nakai were poor than its.