广西4个蒜头果家系幼苗光合生理特征分析  

Analysis on Photosynthetic Physiological Characteristics of Seedlings of Four Malania oleifera Families in Guangxi

作　　者：黄晓露[1] 杨日升 骆相华 苏方贵 李宝财[1] 杨卓颖 梁文汇[1] Huang Xiaolu;Yang Risheng;Luo Xianghua;Su Fanggui;Li Baocai;Yang Zhuoying;Liang Wenhui(Guangxi Forestry Research Institute,Guangxi Key Laboratory of Special Non-wood Forest Cultivation&Utilization,Nanning,Guangxi 530002,China;Agricultural,Forestry and Water Conservancy Technology Service Center of Zhaiya Village,Hechi,Guangxi 547603,China;Walnut Research Center of Fengshan County,Hechi,Guangxi 547600,China)

机构地区：[1]广西壮族自治区林业科学研究院广西特色经济林培育与利用重点实验室,广西南宁530002 [2]砦牙乡农业林业水利技术服务中心,广西河池547603 [3]凤山县核桃科研开发中心,广西河池547600

出　　处：《广西林业科学》2022年第4期482-488,共7页Guangxi Forestry Science

基　　金：广西林科院基本科研业务费专项(林科202112号);中央预算内投资计划项目(2017-450000-02-01-000800)。

摘　　要：为探讨广西不同家系蒜头果(Malania oleifera)幼苗的光合生理特性,以4个蒜头果家系幼苗为试验材料,对其生长情况和叶片光合生理特征指标、叶绿素荧光参数进行测定,拟合光响应曲线并计算光合参数。结果表明,有效光辐射为0~600μmol·m^(-2)·s^(-1)时,叶片实测净光合速率随有效光辐射增加呈增加趋势;有效光辐射为600~1000μmol·m^(-2)·s^(-1)时,趋于平稳;有效光辐射为1200μmol·m^(-2)·s^(-1)时,FS8幼苗的净光合速率下降;有效光辐射为1800μmol·m^(-2)·s^(-1)时,TL3、BM1和FS1幼苗的净光合速率下降。随有效光辐射增加,叶片气孔导度和蒸腾速率呈上升趋势,胞间二氧化浓度呈降低趋势。水分利用效率和潜在水分利用效率均随有效光辐射增加表现为先增加再趋于平稳。光响应曲线模型计算结果显示,4个家系实生幼苗光补偿点为6.170~44.556μmol·m^(-2)·s^(-1),光饱和点为292.703~380.266μmol·m^(-2)·s^(-1),最大净光合速率为7.511~7.890μmol·m^(-2)·s^(-1)。TL3幼苗的苗高、地径最大,最大净光合速率最高,光补偿点最低,光饱和点最高,对环境的适应能力较强;Fv/Fm、Fv/Fo值最大,捕获光能的效率更高。FS1和FS8幼苗的光饱和点较低,生长情况较弱,对光照要求较高。4个家系幼苗皆处于正常的生长状态。In order to discuss photosynthetic and physiological characteristics of seedling of different Malania oleifera families in Guangxi,using seedlings of four M.oleifera families as materials,growth conditions,photo‐synthetic physiological characteristics and chlorophyll fluorescence parameters of leaves were determined.Light response curves were fitted and photosynthetic parameters were calculated.Results showed that measured net photosynthetic rate(Pn)of leaves increased with increase of photosynthetically active radiation(PAR)from 0 to 600μmol·m^(-2)·s^(-1),and tended to be stable with increase of PAR from 600 to 1000μmol·m^(-2)·s^(-1).Pn of FS8 seedling decreased when PAR was 1200μmol·m^(-2)·s^(-1).Pn of TL3,BM1 and FS1 seedlings decreased when PAR was 1800μmol·m^(-2)·s^(-1).The stomatal conductance(Gs)and transpiration rate(Tr)of leaves showed increasing trend with in‐crease of PAR,while intercellular CO2 concentration(Ci)showed decreasing trend.Both water use efficiency(WUE)and potential water use efficiency(WUEi)increased firstly and then tended to be stable with increase of PAR.Calculation results of light response curve model showed that light compensation points(LCP)of seed‐lings of four families were 6.170~44.556μmol·m^(-2)·s^(-1),light saturation points(LSP)were 292.703~380.266μmol·m^(-2)·s^(-1),and maximum net photosynthetic rates(Pnmax)were 7.511~7.890μmol·m^(-2)·s^(-1).Height,ground diameter,Pnmax and LSP of TL3 seedling were the highest and LCP was the lowest,which indicated that TL3 seedling had stronger adaptability to environment.Fv/Fm and Fv/Fo values were the highest which indicated that TL3 seedling had strong ability to capture and convert light energy.FS1 and FS8 seedlings had higher re‐quirements for light with lower LCP and lower growth quantity.All the seedlings were in normal growth conditions.

关 键 词：光响应曲线 光合生理特性 叶绿素荧光 蒜头果 

分 类 号：Q945[生物学—植物学]