油茶无性系新梢生长期光合特性的研究  

Study on Photosynthetic Characteristics in Shoot-growing Stage of Camellia oleifera Clones

作　　者：王瑞[1] 陈永忠[1] 王湘南[1] 彭邵锋[1] 杨小胡[1] 王玉娟[1] 杨杨[1] 

机构地区：[1]湖南省林业科学院,湖南长沙410004

出　　处：《林业科学研究》2010年第3期405-410,共6页Forest Research

基　　金：国家科技部科技支撑项目"油茶高产优质培育技术研究"(2006BAD18B02-04);国家林业局重点推广项目"湘林系列油茶新品系繁育及配套丰产技术示范与推广"

摘　　要：以油茶无性系高产品种、中产品种和普通品种为试材,采用LI-6400P便携式光合测定系统在新梢生长期对其净光合速率、蒸腾速率等日变化规律及光合-光响应曲线进行了比较研究。结果表明：3个品种净光合速率日变化曲线存在单峰和双峰两种类型,高产品种与中产品种为单峰型,普通品种为双峰型,普通品种存在明显的光合午休现象,3个品种的净光合速率存在显著差异;3个品种上、下部叶片的蒸腾速率的日变化曲线均为单峰型,水分利用效率的日变化曲线均为＂U＂型;3个品种的最大净光合速率在8.404-10.879μmol.m-2.s-1之间,光饱和点在305~318μmol.m-2.s-1之间,光补偿点在24~53μmol.m-2.s-1之间;逐步回归分析表明,影响高产品种叶片净光合速率的主导因子为气孔导度、胞间CO2浓度和相对湿度;气孔导度是影响中产品种净光合速率的主导因子,普通品种净光合速率主要受气孔导度和胞间CO2浓度的影响。Taking Camellia oleifera clones,including high-yield varieties,moderate-yield varieties and common varieties,as materials and using the Li-6400 portable photosynthesis system,the diurnal dynamics of net photosythetic rate（Pn）,transpiration rate,and light response curves of net photosynthetic rate（Pn） in the shoot-growing stage of Camellia oleifera were compared and studied.The results showed that：（1） The diurnal variation of net photosynthetic rate（Pn） presented a single peak curve and a double peak curve,the single peak curve existed in the high-yield and moderate-yield varieties,while the double peak curve existed in the common varieties,and the common varieties appeared an obvious midday depression.There were significantly differences of Pn among the three types of varieties,which provided references for high photosynthetic efficiency breeding of Camellia oleifera.（2）The diurnal variation curve of transpiration rate presented a single peak curve and the diurnal variation curve of WUE presented a U-shaped pattern.（3）The maximum net photosynthetic rate（Pnmax） was 8.404-10.879 μmol CO2·m-2·s-1,light saturation point varied from 305 to 318 μmol·m-2·s-1 and light compensation point varied from 24 to 53 μmol·m-2·s-1.（4） Stomatal conductance（Cond）,intercellular CO2 concentration（Ci） and air relative humidity were the dominant factors influencing the Pn of high-yield varieties.However,the dominant factors were stomatal conductance（Cond） for moderate-yield varieties,and Cond and Ci for common varieties.

关 键 词：油茶 产量 无性系 光合特性 新梢生长期 

分 类 号：S794.4[农业科学—林木遗传育种]