不同供镁水平对两菊芋品种幼苗生物量、光合和叶绿素荧光特性的影响  

Effects of different levels of magnesium supply on the seedling's growth,photosynthesis,and chlorophyll fluorescence characteristics of two Helianthus tuberous varieties.

作　　者：孙晓娥[1] 刘兆普[1] 隆小华[1] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏省海洋生物学重点实验室,南京210095

出　　处：《生态学杂志》2012年第4期823-829,共7页Chinese Journal of Ecology

基　　金：江苏省自主创新项目(CXC1172050);公益性行业(农业)科研专项经费项目(200903001-05);国家科技支撑项目(2011BAD13B09和2009BADA3B04-8);中央高校基本业务费项目(Y0201100249);教育部博士点基金(20100097120016);江苏省科技支撑项目(BE2010305和BE2011368)资助

摘　　要：采用砂培方式研究了不同供镁水平对"南芋1号(Nanyu No.1)"和"青芋2号(Qingyu No.2)"幼苗生物量、光合特性和叶绿素荧光特性的影响。结果表明:缺镁使菊芋叶片叶绿素含量显著降低,干物质积累减少,净光合速率、蒸腾速率和光合电子传递速率显著下降、CO2同化受抑制,同时Fv/Fm、ΦPSII、qP和qN也显著下降,加重了叶片受到光抑制的程度;随着供镁水平的增加,菊芋的干物质积累,叶绿素含量,光合参数和各系列荧光参数均呈现先增加后降低的趋势;南芋1号和青芋2号在镁离子浓度分别为3和6mmol.L-1,叶片的净光合速率、Fo、Fm、Fo'、Fm'、Fv/Fm、ΦPSII、ETR达到最高值,叶绿素a、b及总叶绿素含量也最多,干物质积累量最大;南芋1号的各系列荧光参数、光合参数、叶绿素含量和干物质积累量均显著高于青芋2号。A sand culture experiment was conducted to study the effects of different levels of magnesium（Mg） supply on the seedling＇s growth,photosynthesis,chlorophyll content,and chlorophyll fluorescence characteristics of two Helianthus tuberous varieties（Qinyu No.1 and Nanyu No.2）.Mg deficiency led to a significant decline in the leaf chlorophyll content,net photosynthesis rate（Pn）,transpiration rate（Tr）,and proton electron transport rate（ETR）,and thus,the CO2 assimilation was inhibited.Also,the ETR,Fv/Fm,Φ PSII,qP,and qN decreased significantly,which aggravated photoinhibition,and the excessive excitation energy could not be dissipated in the energy excitation system.All of these resulted in a decrease of dry matter accumulation.With the increasing Mg supply,the leaf chlorophyll content,photosynthetic and chlorophyll fluorescence parameters,and dry matter accumulation all presented a trend of increasing first and decreased then.At the Mg supply of 3 and 6 mmol·L-1,the chlorophyll content,Pn,Fo,Fm,Fo＇,Fm＇,Fv/Fm,ΦPSII,ETR,and dry matter accumulation were the highest for Nanyu No.1 and Qingyu No.2,respectively.As compared with Qingyu No.2,Nanyu No.1 had significantly higher chlorophyll content,fluorescence and photosynthetic parameters,and dry matter accumulation.

关 键 词：镁 菊芋 荧光参数 能量耗散 

分 类 号：S632.9[农业科学—蔬菜学]