摘要
以我国常见行道树种银杏(Ginkgo biloba L.)为对象,分别设置近光(T1,100-200 lx)、远光(T2,30-50 lx)和无光(即对照,CK,0-5 lx)3种不同强度的夜间光照处理,探究夜间光照对秋季变色期(10月1-30日)银杏的光合特性与次生代谢的影响,为城市园林绿化和景观保护提供科学依据.结果表明:(1)夜间光照T1和T2处理下叶绿素a、叶黄素的含量和非调节性能量耗散量子产量均高于CK处理,由大到小表现为T1>T2>CK;而叶绿素b和调节性能量耗散量子产量均低于CK处理,由大到小表现为CK>T2>T1.(2)与CK处理相比,叶片变色初期(1-8日),T1和T2处理银杏的黄酮醇含量降低了4.7%和4.3%,而花青素含量则增加了15.9%和7.5%;夜间光照对叶绿素荧光参数具有不同程度的影响.其中初始荧光、最大荧光、最大光化学效率和光化学淬灭系数降低(3.1%-28.9%),非光化学猝灭系数上升(14.1%-18.3%);随着温度下降,叶片变色后期(15-29日)变化趋势则相反.即T1、T2处理下花青素含量显著降低了34.7%和50.6%,最大光化学效率则显著增加58.5%和56.4%.(3)夜间光照对光合色素和黄酮类化合物含量均有极显著影响(P<0.01),光合色素与花青素之间均存在极显著负相关关系(P<0.01).综上所述,夜间光照对银杏叶片造成了光胁迫,显著影响其光合色素、黄酮类化合物含量和叶绿素荧光指数,改变了光合色素和黄酮类化合物之间的关系,整体推迟了叶片变色期,从而影响植物的正常生长发育.(图7表3参62)
This study focused on the common street tree species Ginkgo biloba L.in China and set up three different intensities of nighttime light treatments:near light(T1,100-200 lx),far light(T2,30-50 lx),and no light(control;CK,0-5 lx),to explore the impact of night light on the photosynthetic characteristics and secondary metabolism of Ginkgo biloba L.during the autumn color-change period(from October 1st to 30th).This study aims to provide a scientific basis for urban landscaping and landscape protection,and the results show that:(1)under the nighttime light T1 and T2 treatments,the content of chlorophyll a and xanthophylls and the quantum yield of non-regulated energy dissipation were all higher than those in the CK treatment,with T1>T2>CK from large to small,while the quantum yield of chlorophyll b and regulated energy dissipation were both lower than those in the CK treatment,with CK>T2>T1 from large to small.(2)Compared with the CK treatment,during the early stage of leaf coloration(1st-8th),the content of flavanols in Ginkgo under T1 and T2 treatments decreased by 4.7% and 4.3%,while the content of anthocyanins increased by 15.9% and 7.5%;nighttime light had different degrees of impact on chlorophyll fluorescence parameters.Among them,the initial fluorescence,maximum fluorescence,maximum photochemical efficiency,and photochemical quenching coefficient decrease(3.1%-28.9%),while the non-photochemical quenching coefficient increases(14.1%-18.3%).As the temperature decreased,the changing trends in the later stages of leaf coloration(15th-29th)were the opposite.Specifically,the content of anthocyanins in Ginkgo biloba L.under T1 and T2 treatments significantly decreased by 34.7% and 50.6%,while the maximum photochemical efficiency significantly increased by 58.5% and 56.4%.(3)Nighttime light had a significant impact on the contents of photosynthetic pigments and flavonoids(P<0.01),and there was a significant negative correlation between photosynthetic pigments and anthocyanins(P<0.01).In summary,nighttime light causes photo stress in Ginkgo biloba L.leaves,significantly affecting their photosynthetic pigments,flavonoid content,and chlorophyll fluorescence indices,thereby postponing the leaf coloration period and affecting the normal growth and development of the plant.
作者
曾祎珣
秦倩倩
刘艳红
ZENG Yixun;QIN Qianqian;LIU Yanhong(College of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;College of Geographical Sciences,Hebei Normal University,Shijiazhuang 050010,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2024年第4期750-758,共9页
Chinese Journal of Applied and Environmental Biology
基金
国家重点研发计划项目(2017YFC0504004)资助。
关键词
银杏
夜间光照
叶片变色期
光合特性
次生代谢
Ginkgo biloba L.
nighttime light
leaf coloration period
photosynthetic characteristics
secondary metabolism
