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  • 秦惠珍,邹蓉,韦霄,柴胜丰,唐凤鸾.光强对白花兜兰光合特性及干物质积累的影响[J].广西科学,2023,30(6):1171-1179.    [点击复制]
  • QIN Huizhen,ZOU Rong,WEI Xiao,CHAI Shengfeng,TANG Fengluan.Effects of Light Intensity on Photochemistry and Dry Weight Accumulation of Paphiopedilum emersoniii[J].Guangxi Sciences,2023,30(6):1171-1179.   [点击复制]
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光强对白花兜兰光合特性及干物质积累的影响
秦惠珍1,2, 邹蓉1, 韦霄1, 柴胜丰1, 唐凤鸾1
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(1.广西壮族自治区中国科学院广西植物研究所, 广西植物功能物质与资源持续利用重点实验室, 广西桂林 541006;2.广西大学林学院, 广西森林生态与保育重点实验室, 广西南宁 530004)
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,Pn)日变化影响基本一致,Pn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Pn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Pn影响较大。RI 30光强处理下白花兜兰叶片Pn日均值最大且具有最大净光合速率 (Pmax)、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750 μmol·m-2·s-1,约为自然光强(2 500 μmol·m-2·s-1)的30%。
关键词:  白花兜兰  光强  光合特性  叶绿素  生物量
DOI:10.13656/j.cnki.gxkx.20240125.016
投稿时间:2023-06-27修订日期:2023-10-15
基金项目: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。
Effects of Light Intensity on Photochemistry and Dry Weight Accumulation of Paphiopedilum emersoniii
QIN Huizhen1,2, ZOU Rong1, WEI Xiao1, CHAI Shengfeng1, TANG Fengluan1
(1.Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, 541006, China;2.Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, Guangxi, 530004, China)
Abstract:
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 (Pn) of Paphiopedilum.Pn decreased with time.Photosynthesis in leaves of P.emersoniii mainly occurred before noon.Stomatal factors had great influence on Pn of P.emersoniii leaf under RI 10 light intensity treatment.The decrease of Pn of leaves of P.emersoniii under different light intensity treatment was mainly caused by non-stomatal factors.Stomatal factors had great influence on Pn of P.emersoniii leaf under RI 10 light intensity treatment.Under RI 30 light intensity treatment, the average daily Pn of the leaves of P.emersoniii had the maximum Net Photosynthetic Rate (Pmax), 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 750 μmol·m-2·s-1, which is about 30% of the natural light intensity (2 500 μmol·m-2·s-1).
Key words:  Paphiopedilum emersoniii  light intensity  photosynthetic characteristics  chlorophyll  biomass

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