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谢东锋,张光灿,夏宣宣,郎莹.不同浓度酚酸对欧美杨I-107苗木生长和光合特性的影响.生态学报,2018,(5).http://dx.doi.org/10.5846/stxb201704120646  
不同浓度酚酸对欧美杨I-107苗木生长和光合特性的影响
Effects of phenolic acids on the growth and photosynthesis of Populus×euramericana ‘Neva’
投稿时间:2017-04-12  修订日期:2017-10-18
DOI: 10.5846/stxb201704120646
关键词酚酸  光合作用  化感物质  胁迫  杨树
Key Wordsphenolic acid  photosynthesis  allelochemical  stress  poplar
基金项目国家重点基础研究发展计划项目(2012CB416904);国家自然科学基金(31500511);山东省自然科学基金联合专项(ZR2015CL044)共 同资助
作者单位E-mail
谢东锋 山东农业大学临沂大学 y010249@163.com 
张光灿 山东农业大学 zhgc@sdau.edu.cn 
夏宣宣 江苏省邮电规划设计院有限责任公司  
郎莹 临沂大学  
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摘要:
模拟杨树人工林根际土壤酚酸累积,以杨树人工林二代连作土壤中酚酸含量为参考值(X),对欧美杨I-107(Populus×euramericana ‘Neva’)一年生盆栽苗木进行不同浓度酚酸(0X、0.5X、1.0X)处理,通过比较不同浓度酚酸对杨树苗木生长和生理生化特性的影响,来揭示酚酸胁迫对杨树生长的抑制作用和机理。结果表明:随酚酸浓度增加,杨树苗木净光合速率(Pn)、气孔限制值(Ls)、蒸腾速率(Tr)、水分利用效率(WUE)、最大净光合速率(Pnmax)、表观光合量子效率(Φ)、暗呼吸速率(Rd)、最大荧光(Fm)、光系统Ⅱ(PSⅡ)实际光化学效率(ΦPSⅡ)、PSⅡ最大光化学效率(Fv/Fm)、叶绿素(Chl)荧光光化学淬灭(qP)、表观光合电子传递速率(ETR)、Chl含量和苗木总生物量显著降低,杨树苗木胞间CO2浓度(Ci)、光补偿点(LCP)、叶绿素初始荧光(Fo)、非光化学淬灭(NPQ)、丙二醛(MDA)含量和苗木根茎比明显增大。结论:酚酸显著抑制杨树苗木的光合作用、蒸腾作用和呼吸作用,且酚酸浓度越大,抑制作用越强;随着酚酸浓度的增加,杨树苗木有机物积累明显降低,叶片细胞受到显著伤害。光合机构通过增加热耗散实施光保护,光合产物更多的向苗木地下部分分配,是杨树适应酚酸胁迫的生理对策。
Abstract:
The degradation of forestland productivity in continuous-cropping poplar plantations is strongly related to the accumulation of phenolic acids in the soil. Therefore, the present study aimed to examine the effects of phenolic acid concentration on the photosynthetic characteristics and growth traits of poplar and to clarify the stress mechanism of phenolic acids on poplar growth. We established three treatments (CK, 0.5X, and 1.0X), based on the field concentration (X) of phenolic acids in the soil of a second-generation continuous-cropping poplar plantation and measured the physiological and biochemical parameters and growth indices of treated one-year-old black poplar cultivar I-107 (Populus×euramericana ‘Neva’). The results indicated that net photosynthetic rate (Pn), stomatal limitation (Ls), water use efficiency (WUE), transpiration rate (Tr), light-saturated net photosynthetic rate (Pnmax), apparent quantum yield (Φ), dark respiration rate (Rd), maximal fluorescence yield of the dark-adapted state (Fm), effective quantum efficiency of PSII (ΦPSⅡ), potential quantum efficiency of PSII (Fv/Fm), photochemical quenching coefficient (qP), electron transport rate (ETR), chlorophyll (Chl) content, and total biomass decreased significantly with increasing concentrations of phenolic acids, whereas the intercellular CO2 concentration (Ci), light compensation point (LCP), minimal fluorescence yield of the dark-adapted state (Fo), non-photochemical quenching (NPQ), malondialdehyde (MDA) content, and root/shoot ratio (R/S) increased significantly. We concluded that phenolic acid stress significantly reduces the photosynthesis, transpiration and respiration of poplar and that phenolic acid concentration and the inhibition of the poplar’s physiological activities are positively correlated. With increasing phenolic acid concentrations, the organic matter accumulation of the poplar seedlings decreased significantly, and poplar leaf cells were seriously damaged. Therefore, poplar responds to phenolic acid stress by increasing the dissipation of excess light energy to alleviate damage to the photosynthetic apparatus under strong light conditions and by distributing photosynthates underground to promote root growth and nutrient absorption.
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