广西科学院学报

引用本文：

秦惠珍,邹蓉,邓丽丽,杨一山,柴胜丰,蒋强,罗亚进.3种观赏性石斛的光合特性比较研究[J].广西科学院学报,2022,38(2):147-154. [点击复制]
QIN Huizhen,ZOU Rong,DENG Lili,YANG Yishan,CHAI Shengfeng,JIANG Qiang,LUO Yajin.Comparative Study on Photosynthetic Characteristics of Three Ornamental Dendrobium Species[J].Journal of Guangxi Academy of Sciences,2022,38(2):147-154. [点击复制]

【打印本页】【在线阅读全文】【下载PDF全文】【查看/发表评论】【下载PDF阅读器】【关闭】

本文已被：浏览 361次下载 333次	码上扫一扫！
3种观赏性石斛的光合特性比较研究
秦惠珍¹, 邹蓉¹, 邓丽丽¹, 杨一山¹, 柴胜丰¹, 蒋强², 罗亚进²
0 字体:加大+\|默认\|缩小-
(1.广西壮族自治区中国科学院广西植物研究所, 广西喀斯特植物保育与恢复生态学重点实验室, 广西桂林 541006;2.广西雅长兰科植物国家级自然保护区管理中心, 广西百色 533209)

摘要:

为探明3种观赏性石斛属Dendrobium Sw.植物在光合生理方面的差异，为其栽培及规模化种植提供理论依据。本研究以3种观赏性石斛(叠鞘石斛D.denneanum Kerr.、流苏石斛D.fimbriatum Hook.和束花石斛D.chrysanthum Wall.ex Lindl.)为材料，测定其叶片的光响应曲线、CO₂响应曲线及叶绿素相对含量(SPAD值)，探究其光合特性。结果表明，叠鞘石斛、流苏石斛和束花石斛3种石斛属植物的光补偿点(LCP)分别为2.15 μmol·m^-2·s^-1、3.74 μmol·m^-2·s^-1、1.79 μmol·m^-2·s^-1,光饱和点(LSP)分别为995.09 μmol·m^-2·s^-1、679.44 μmol·m^-2·s^-1、712.28 μmol·m^-2·s^-1,LCP均低于5 μmol·m^-2·s^-1,LSP均低于1 000 μmol·m^-2·s^-1,属于典型的阴生植物，具有较强的耐阴性；3种石斛的最大净光合速率(P_max)分别为3.54 μmol·m^-2·s^-1、3.86 μmol·m^-2·s^-1、4.03 μmol·m^-2·s^-1,表观量子效率(AQY)分别为0.042，0.044和0.051，束花石斛的P_max和AQY最大，光合作用能力较强。3种石斛的CO₂响应曲线中，最大净光合速率(A_max)大小依次为叠鞘石斛(11.99 μmol·m^-2·s^-1)、流苏石斛(10.87 μmol·m^-2·s^-1)、束花石斛(4.75 μmol·m^-2·s^-1),叠鞘石斛利用CO₂进行光合作用的能力最强；3种石斛的CO₂饱和点(CSP)无显著性差异，在CO₂浓度不大于2 000 μmol·mol^-1时均未到达饱和点；CO₂补偿点(CCP)具有显著性差异，CCP分别为100.12 μmol·m^-2·s^-1、158.02 μmol·m^-2·s^-1、134.44 μmol·m^-2·s^-1,其中叠鞘石斛的CCP最低，对低浓度CO₂的利用能力最强。3种石斛叶片的SPAD值分别为51.09，56.93和58.06，其高低与其净光合速率的大小有一定程度的相关性。在3种石斛中，束花石斛的光合作用能力最强，对弱光的利用能力较强；流苏石斛对弱光的利用能力较弱，光照适应范围狭窄；叠鞘石斛对强光的利用能力较强，光合作用适应范围较广。此外，3种石斛均具有较强的耐阴性，对CO₂的耐受性也较强，在种植时应提供适当的遮阴和增加CO₂浓度来提高石斛的光合作用能力。

关键词: 石斛属|光响应曲线|CO₂响应曲线|叶绿素相对含量|光抑制

DOI：10.13657/j.cnki.gxkxyxb.20220622.006

投稿时间：2022-01-20

基金项目:广西科技基地和人才专项(桂科AD18281006)，广西植物研究所基本业务费项目(桂植业21002,21012和21013)和广西科学院基本业务费项目(2019YJJ1008)资助。

Comparative Study on Photosynthetic Characteristics of Three Ornamental Dendrobium Species

QIN Huizhen¹, ZOU Rong¹, DENG Lili¹, YANG Yishan¹, CHAI Shengfeng¹, JIANG Qiang², LUO Yajin²

(1.Guangxi Key Laboratory of Plant Consevation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, 541006, China;2.Guangxi Yachang Orchid National Nature Reserve Management Center, Baise, Guangxi, 533209, China)

Abstract:

The differences of photosynthetic physiology among three kinds of ornamental Dendrobium Sw.plants were explored to provide theoretical basis for their cultivation and large-scale planting. In this study,three kinds of ornamental Dendrobium (D.denneanum Kerr.,D.fimbriatum Hook. and D.chrysanthum Wall.ex Lindl.) were used as materials. The light response curve,CO₂ response curve and chlorophyll relative content (SPAD value) of leaves were measured to explore their photosynthetic characteristics. The results showed that the light compensation points (LCP) of the D.denneanum,D.fimbriatum and D.chrysanthum were 2.15 μmol·m^-2·s^-1,3.74 μmol·m^-2·s^-1,1.79 μmol·m^-2·s^-1,respectively,and the light saturation points (LSP) were 995.09 μmol·m^-2·s^-1,679.44 μmol·m^-2·s^-1,712.28 μmol·m^-2·s^-1,respectively. The LCP of the three Dendrobium were lower than 5 μmol·m^-2·s^-1,LSP were lower than 1 000 μmol·m^-2·s^-1.The three Dendrobium belonged to typical shade plants and had strong shade tolerance.The maximum net photosynthetic rates (P_max) of the three Dendrobium species were 3.54 μmol·m^-2·s^-1,3.86 μmol·m^-2·s^-1 and 4.03 μmol·m^-2·s^-1,respectively,and the apparent quantum yield (AQY) were 0.042,0.044,and 0.051,respectively.The P_max and AQY of the D.chrysanthum was the largest,and the photosynthesis ability was strong.The maximum net photosynthetic rate (A_max) in the CO₂ response curves of the three Dendrobium were in order of D.denneanum (11.99 μmol·m^-2·s^-1),D.fimbriatum (10.87 μmol·m^-2·s^-1),D.chrysanthum (4.75 μmol·m^-2·s^-1). D.denneanum had the strongest ability to use CO₂ for photosynthesis. There was no significant difference in the CO₂ saturation point (CSP) among the three species of Dendrobium, and no CSP was reached when the CO₂ concentration was not greater than 2 000 μmol·mol^-1. The CO₂ compensation point (CCP) was significantly different,and the CCP were 100.12 μmol·m^-2·s^-1,158.02 μmol·m^-2·s^-1 and 134.44 μmol·m^-2·s^-1,respectively. The CCP of D.denneanum was the lowest,and the utilization ability of low concentration CO₂ is the strongest. The SPAD values of the leaves of the three species of Denneanum were 51.09,56.93 and 58.06,respectively,and their levels had a certain degree of correlation with their net photosynthetic rates. Among the three kinds of Dendrobium,D.chrysanthum has the strongest photosynthesis ability and stronger utilization ability of weak light. D.fimbriatum has weak light utilization ability and narrow light adaptation range. D.denneanum has a strong ability to utilize strong light and a wide range of photosynthesis adaptation. In addition,the three kinds of Dendrobium had strong tolerance to negative shade and strong tolerance CO₂,and appropriate shading should be provided and the concentration of CO₂ should be increased to improve the photosynthetic ability during planting.

Key words: Dendrobium Sw.|light response curve|CO₂ response curve|SPAD value|photoinhibition

用微信扫一扫