开花对白芨光合作用的影响  

Effect of flowering on photosynthesis of Bletilla striata

作　　者：冯美玲 杨肖华[1] 商靓婷 赖晓莲[1] 郭圣茂[1] Feng Meiling;Yang Xiaohua;Shang Jingting;Lai Xiaolian;Guo Shengmao(College of Landscape and Art, Jiangxi Agricultural University, Nanchang Jiangxi 330045, Chin)

机构地区：[1]江西农业大学园林与艺术学院,江西南昌330045

出　　处：《南方林业科学》2018年第2期13-16,共4页South China Forestry Science

摘　　要：[目的]以白芨(Bletilla striata Rchb.f.)为试材,研究开花、含苞、非开花3种状态下白芨的叶绿素荧光特性,观察不同状态下光合能力的变化情况,以期为其后续优良品种的高效栽培技术提供理论依据。[方法]用便携式调制荧光仪PAM-2500(德国)测定2-3年生白芨的叶绿素荧光参数。[结果]开花、含苞、非开花白芨3种状态的初始荧光(Fo)、最大荧光(Fm)、光化学效率(Fv/Fm)表现相对稳定;而非光化学淬灭系数(NPQ)具有显著性差异;光合电子传递速率(ETR)、光化学淬灭系数(qp)和非光化学淬灭系数(qn)分别呈显著正相关。[结论]开花降低了白芨电子传导效率,光反应中心开放程度减少,同时依赖于热耗散的光保护能力减弱。【Objectives】Bletilla striata Rchb. f. as experimental materials, studying the flowering, bracts, non flowering under three states chlorophyll fluorescence characteristics of B. striata,observe the change of photosynthetic capacity under different states, so as to provide theoretical basis for the effective cultivation techniques of the following fine varieties.【Methods】The chlorophyll fluorescence parameters of 2-3 years of B. striata were measured by portable modulator PAM-2500（Germany）.【Results】The dark fluorescence yield（Fo）, maximal fluorescence yield（Fm） and maximal quantum yield（Fv/Fm） were relatively stable in flowering, bracts, and non-flowering B. striata. The non-photochemical quenching coefficient（NPQ） has significant difference. Photochemical quenching coefficient（qp） and electron transport rate（ETR） and non-photochemical quenching coefficient（qn） were significantly positively correlated.【Conclusions】Flowering reduces the openness of the B.striata light reaction center, resulting in reduced electron conduction efficiency of photosynthesis, and the reduced ability to rely on thermal dissipation of light.

关 键 词：白芨 开花 叶绿素荧光 

分 类 号：S567.239[农业科学—中草药栽培] Q945.11[农业科学—作物学]