浙江农林大学学报2025，Vol.42Issue(6)：1174-1183,10.DOI:10.11833/j.issn.2095-0756.20240625
遮光对单叶铁线莲生长和光合特性的影响
Effect of shading on the growth and photosynthetic characteristics of Clematis henryi
摘要
Abstract
[Objective]The objective is to explore the photosynthetic response mechanism of Clematis henryi to different light intensities,and to provide support for the introduction,cultivation and garden application of C.henryi.[Method]From March to October 2022,3-year-old C.henryi cuttings were used as experimental materials,and 5 light treatments,including 82%(T1),61%(T2),53%(T3),43%(T4),and 0%(full light,the control)shading,were set up to study the effects of different shading degrees on the growth and photosynthetic characteristics of C.henryi.[Result]T1 and T2 treatments helped maintain dark green leaf color of C.henryi in summer and promoted the increase in leaf area,internode spacing,leaf dry mass,and water content(mean values of the two treatments being 2.17,1.43,6.60,and 1.51 times those of the control,respectively).These treatments facilitated the expansion of leaf spongy tissue(with an average of 1.28 times that of the control)while inhibiting palisade tissue growth(with an average of 0.76 times that of the control).The leaves of plants treated with shading below 61%(T2)turned yellow and wrinkled.The shading treatments stimulated increases in leaf area,internode distance,leaf dry weight,and water content,which were 1.49,1.31,3.47,and 1.20 times those of the control,respectively.They also promoted spongy tissue expansion(1.12 times the control)while suppressing palisade tissue growth(0.86 times the control).From June to August,with the continuous increase of light intensity and temperature,the diurnal variations in net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr)of plants treated by T1,T2,and T3-changed from a single-peak to a double-peak curve.The leaves protected their photosynthetic systems through photosynthetic midday depression.Concurrently,by lowering the light compensation point(PLC)(81.72%of the control)and dark respiration rate(RD)(67.70%of the control),the plants adapted to low-light environments and enhanced light energy utilization.By stabilizing the initial fluorescence(Fo),electron transport rate(RET),and non-photochemical quenching coefficient(QNP),the photochemical efficiency of PSⅡ was maintained.Meanwhile,the photosynthetic systems of T4 and plants of the control group were subjected to excessive stress from strong light and high temperature,resulting in irregular variations in photosynthetic and chlorophyll fluorescence parameters.In October,growth,photosynthetic and chlorophyll fluorescence parameters of plants treated by T1,T2 and T3 recovered faster than those by T4.[Conclusion]C.henryi has strong shade tolerance,and shading treatment can promote the growth of branches and leaves.In summer cultivation,a shading environment of 61%to 82%should be set up to avoid irreversible damage to the photosynthetic system caused by high temperature and strong light,and ensure the healthy growth of plants.The shade tolerance of C.henryi will effectively expand its scope of garden applications,providing more choices for plant landscape construction in understory,north balcony,and indoor space.[Ch,2 fig.4 tab.32 ref.].关键词
铁线莲属/单叶铁线莲/遮光/光合特性/叶绿素荧光Key words
Clematis/Clematis henryi/shading/photosynthetic characteristics/chlorophyll fluorescence分类
农业科技引用本文复制引用
ZHAO Changgao,CHEN Zihang,ZHANG Chengchai,TAO Li,WANG Yutong,ZHANG Quhua,XU Yuanke,HE Weichen,LIU Zhigao..遮光对单叶铁线莲生长和光合特性的影响[J].浙江农林大学学报,2025,42(6):1174-1183,10.基金项目
浙江省农业新品种重大专项花卉育种专项(2021C02071-6-4) （2021C02071-6-4）
浙江省农业(林木)新品种选育重大科技专项(2016C02056-13-4) （林木）
浙江省景宁县科技计划项目(2023A34) （2023A34）
浙江农林大学学生科研训练项目(2024kx0046) （2024kx0046）
