CAJ | 학술논문

以西南特有濒危植物甜菜树为材料,研究了不同遮荫处理(全光照、50％遮荫、65％遮荫和80％遮荫)对甜菜树叶片光合特性、叶绿素荧光和气孔特征的影响,为甜菜树种质资源保育和开发利用提供科学依据。结果表明：50％遮荫处理显著提高了甜菜树叶片净光合速率,80％遮荫处理则起抑制作用；50％遮荫和65％遮荫处理提高甜菜树叶蒸腾速率,有利于光合作用的进行；80％遮荫处理下胞间 CO 2浓度提高,抑制了甜菜树叶蒸腾作用和光合作用；50％遮荫和65％遮荫处理下净光合速率提高,说明甜菜树对遮荫有一定的适应性；叶绿素荧光方面,80％遮荫处理导致叶片 PSⅡ最大光化学效率(F v/F m )和实际光化学效率(ФPSⅡ)下降。甜菜树叶片光合特性与气孔结构关系密切,遮荫降低甜菜树叶片气孔密度。
이서남특유빈위식물첨채수위재료,연구료불동차음처리(전광조、50％차음、65％차음화80％차음)대첨채수협편광합특성、협록소형광화기공특정적영향,위첨채수충질자원보육화개발이용제공과학의거。결과표명：50％차음처리현저제고료첨채수협편정광합속솔,80％차음처리칙기억제작용；50％차음화65％차음처리제고첨채수협증등속솔,유리우광합작용적진행；80％차음처리하포간 CO 2농도제고,억제료첨채수협증등작용화광합작용；50％차음화65％차음처리하정광합속솔제고,설명첨채수대차음유일정적괄응성；협록소형광방면,80％차음처리도치협편 PSⅡ최대광화학효솔(F v/F m )화실제광화학효솔(ФPSⅡ)하강。첨채수협편광합특성여기공결구관계밀절,차음강저첨채수협편기공밀도。
In order to provide the scientific basis for the species conservation and sustainable exploitation and utiliza-tion,the effect of different shadness(0,50%,65% and 80% shading)on the photosynthetic characteristics,chloro-phyll fluorescence and stomata structure of an endangered species Yunnanopilia longistaminata were studied.The results indicated that net photosynthetic increased at 50% shading but decreased at 80% shading.The transpiration rate and stomatal conductance increased at both 50% and 65% shading,which was helpful to photosynthetic process. Meanwhile,both of net photosynthetic and transpiration rates of the plant were suppressed as a result of the stomata limitation and the increase of the intercelluer CO2 at 80% shading.For the chlorophyll fluorescence parameters,the maximal photochemical efficiency (F v/F m )and the actual quantum yield of photosystem Ⅱ(ΦPSⅡ)decreased signifi-cantly under 80% shading.Shading treatments also decreased the stomatal density and stomatal index.