油茶无性系果实成熟期光合特性的研究  

Photosynthetic characteristics in Camellia oleifera clones at fruit maturation stage

作　　者：陈永忠[1] 王瑞[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：《经济林研究》2010年第2期1-6,共6页Non-wood Forest Research

基　　金：国家"十一五"科技支撑项目"华中丘陵区油茶高产良种应用集成示范"(2009BADB1B04);"油茶香榧高产优质新品种选育"(2006BAD01A1706);"油茶高产优质培育技术研究"(2006BAD18B02-04)

摘　　要：为了从光合生理方面了解油茶新品种的产量性状,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,在果实成熟期对其净光合速率（Pn）、蒸腾速率（Tr）等日变化参数及光合-光响应曲线进行了测定与比较分析。结果表明：其净光合速率日变化曲线均呈宽大的单峰型,不存在光合午休现象,3个品种类型的净光合速率均存在着显著的差异;3个品种类型上、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个品种类型的最大净光合速率在11.574~14.04μmol.m-2s-1之间,光饱和点在369~500μmol.m-2s-1之间,光补偿点在19~23μmol.m-2s-1之间;逐步回归分析结果表明,影响高产品种叶片Pn的主导因子为气孔导度,光合有效辐射和参比室的CO2浓度是影响中产品种的主导因子,普通品种主要受胞间CO2浓度的影响。In order to learn yield characteristics in new variety of Camellia oleifera from photosynthetic physiology aspect,diurnal changes of net photosynthetic rate（Pn） and transpiration rate（Tr） were studied comparatively with LI-6400P portable photosynthetic system,taking high-yield variety,medium-yield variety and ordinary variety in C.oleifera clones as materials.The results showed that all Pn diurnal change curves were of single peak type,＂Midday depression＂ phenomenon of photosynthesis didn＇t occur in all varieties,and there were significant differences among Pn of three varieties.All Tr diurnal changes curves were of single peak type,while all diurnal change curves of water use efficiency were of ＂U＂ type.The maximum Pn of three varieties was 11.574-14.040 μmol·m-2s-1,their light saturation points was 369-500 μmol·m-2s-1,and their light compensation point was 19-23 μmol·m-2s-1.The results of multiple regression analysis showed that the main factor influencing Pn of the high-yield variety was stomatal conductance,the main factors influencing Pn of the medium-yield variety were photosynthetic active radiation and CO2 concentration,and the ordinary variety was mainly influenced by intercellular CO2 concentration.

关 键 词：油茶 产量 无性系 光合特性 果实成熟期 

分 类 号：S794.4[农业科学—林木遗传育种]