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以盆栽短梗大参为试验材料,探讨不同遮荫处理(全光日照、70%光日照及40%光日照)对短梗大参苗木叶绿素含量、光合作用和生长的影响,为耐阴植物引种栽培及在园林上的应用提供理论依据。结果表明:在遮荫处理下短梗大参生长良好,叶色浓绿,植株的冠幅和复叶数显著高于全光日照(P<0.05);遮荫处理下叶绿素a、叶绿素b及总叶绿素的含量显著高于全光日照(P<0.05),且随着遮荫程度增强而增加,而叶绿素a/b则呈下降趋势。与全光日照相比,遮荫处理提高了短梗大参表观量子效率(AQY)和最大净光合速率(Pmax),同时明显降低了光饱和点(LSP)和光补偿点(LCP)。遮荫处理提高了PSⅡ原初光能转换效率(Fv/Fm)和潜在活性(F0/Fm),尤其是40%光日照下Fv/Fm和F0/Fm均显著高于全光日照(P<0.05)。遮荫处理下非光化学猝灭系数(NPQ)显著低于全光日照(P<0.05),并随着遮荫程度的增加而进一步降低,以减少热耗散等途径来提高PSⅡ光能转化效率,但光化学猝灭系数(q P)受遮荫处理影响不大。因此,作为喜阴植物,短梗大参具有较强的弱光利用能力,适宜生长于适度荫蔽的环境。
The effects of different shading treatments (total light sunshine, 70% light sunshine and 40% light sunshine) on the chlorophyll content, photosynthesis and growth of short stalk, Introduction and cultivation in gardens and provide a theoretical basis. The results showed that under the shade treatment, the short stalk had a good growth, the leaf color was dark green, the crown width and the number of the compound leaf were significantly higher than that of the full sunlight (P <0.05); Under the shading treatment, the chlorophyll a, chlorophyll b, The content of total chlorophyll was significantly higher than that of total sunlight (P <0.05), and increased with the degree of shading, while the chlorophyll a / b decreased. Shading treatment increased the apparent quantum yield (AQY) and the maximum net photosynthetic rate (Pmax) of short stalk, and significantly reduced the light saturation point (LSP) and light compensation point (LCP) compared with that of full sunlight. The shading treatment increased the primary photochemical efficiency (Fv / Fm) and the potential activity (F0 / Fm) of PS Ⅱ, especially the Fv / Fm and F0 / Fm under 40% ). The non-photochemical quenching coefficient (NPQ) under shading treatment was significantly lower than that of total sunlight (P <0.05), and further decreased with the increase of shading degree, and the heat dissipation was reduced to improve the PSⅡ light energy conversion efficiency , But the photochemical quenching coefficient (q P) was not affected by shading treatment. Therefore, as a favorite shade plants, short stalk Senate has a strong ability to use weak light, suitable for growth in a moderate shade of the environment.