摘要
为探明最适宜栽培白花兜兰(Paphiopedilum emersoniii)的光强,采用人工遮阴方法研究不同光强处理(RI 10、RI 30和RI 50)对其叶片光合日变化、光响应曲线、叶绿素含量,以及地上、地下部分生物量的影响。结果表明:不同光强对白花兜兰净光合速率(Net photosythetic rate,P_(n))日变化影响基本一致,P_(n)均随着时间递进而降低,白花兜兰叶片进行光合作用主要集中在12:00之前,不同光强处理下白花兜兰叶片P_(n)的降低主要是由非气孔因素导致的,气孔因素对RI 10光强处理下白花兜兰叶片P_(n)影响较大。RI 30光强处理下白花兜兰叶片P_(n)日均值最大且具有最大净光合速率(P_(max))、光饱和点(Light Saturation Point,LSP)和表观量子效率(Apparent Quantum Efficiency,AQE),显著高于其他光强处理,是白花兜兰生长的最适光强。白花兜兰为阴生植物,RI 50光强处理下白花兜兰叶片叶绿素易受损。经过2个月遮阴处理后,白花兜兰的地上和地下生物量均在RI 30光强处理下最大。因此,人工栽培白花兜兰时应进行适当遮阴处理,其最适宜栽培的光强为750μmol·m^(-2)·S^(-1),约为自然光强(2500μmol·m^(-2)·S^(-1))的30%。
In order to determine the most suitable light intensity for cultivation of Paphiopedilum emersoniii,we examined the diurnal variation of photosynthesis,light response curve,chlorophyll content,aboveground and belowground biomass of leaves under different light intensity treatments(RI 10,RI 30 and RI 50)using artificial shading method.The results show that,different light intensification had the same effect on diurnal change of Net Photosythetic rate(P_(n))of Paphiopedilum.P_(n) decreased with time.Photosynthesis in leaves of P.emersoniii mainly occurred before noon.Stomatal factors had great influence on P_(n) of P.emersoniii leaf under RI 10 light intensity treatment.The decrease of P_(n) of leaves of P.emersoniii under different light intensity treatment was mainly caused by non stomatal factors.Stomatal factors had great influence on P_(n) of P.emersoniii leaf under RI 10 light intensity treatment.Under RI 30 light intensity treatment,the average daily P_(n) of the leaves of P.emersoniii had the maximum Net Photosynthetic Rate(P_(max)),Light Saturation Point(LSP)and Apparent Quantum Efficiency(AQE),which were significantly higher than other light intensity treatments,and were the most suitable light intensity for the growth of P.emersoniii.P.emersoniii is a shade plant,and the leaf chlorophyll of P.emersoniii was easily damaged under RI 50 light intensity treatment.After 2 months of shade treatment,both above and below ground biomass of P.emersoniii was maximum under RI 30 light intensity treatment.Therefore,appropriate shade treatment should be applied to the artificial cultivation of P.emersoniii.The most suitable light intensity for cultivation is 750μmol·m^(-2)·S^(-1),which is about 30%of the natural light intensity(2500μmol·m^(-2)·S^(-1)).
作者
秦惠珍
邹蓉
韦霄
柴胜丰
唐凤鸾
QIN Huizhen;ZOU Rong;WEI Xiao;CHAI Shengfeng;TANG Fengluan(Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences,Guilin,Guangxi,541006,China;Guangxi Key Laboratory of Forest Ecology and Conservation,College of Forestry,Guangxi University,Nanning,Guangxi,530004,China)
出处
《广西科学》
CAS
北大核心
2023年第6期1171-1179,共9页
Guangxi Sciences
基金
广西自然科学基金项目(2023GXNSFAA026253)
国家重点研发计划课题(2022YFF1300703)
国家自然科学基金项目(31760085)
广西林业局科技项目(2023LYKJ03)和广西科技计划项目(桂科AD18281077)资助。
关键词
白花兜兰
光强
光合特性
叶绿素
生物量
Paphiopedilum emersoniii
light intensity
photosynthetic characteristics
chlorophyll
biomass
作者简介
第一作者:秦惠珍(1993-),女,在读博士研究生,主要从事濒危植物保育与研究,E-mail:qhz0122@sina.com;通信作者:唐凤鸾(1978-),女,研究员,主要从事生物技术与濒危植物保育研究,E-mail:1251657759@qq.com。
