摘要
【目的】银杏(Ginkgo biloba L.)叶片在秋季衰老变黄,极具观赏性,但黄化后不久易脱落,讨论叶片黄化和脱落的关系,为提高银杏观赏期提供理论依据。【方法】选取银杏绿色叶、浅绿色叶、黄色叶为本研究的实验材料,测定光合色素含量、吸收光谱和叶绿素荧光参数,分析其变化特征。【结果】在银杏叶片衰老变黄过程中,各种光合色素的含量均呈下降趋势,但并不同步;叶片黄化对可见光吸收量减少,在510~710 nm范围内,光吸收量差异显著;随着叶片黄化,Fv/Fm显著下降,同时PSⅡ最大荧光Fm和单位面积反应中心数量RC/CSm显著减少。【结论】在衰老进程中,银杏叶片色素蛋白复合体解体,色素分散,黄化叶片的这种特性可能有利于其在白天提高叶片温度,有助于叶片内含物的分解和向外转运。
【Objective】In autumn,the leaves of Ginkgo biloba L.age and turn yellow,which is very ornamental,but easy to fall off soon after yellowing.The present paper aimed to discuss the relationship between leaf yellowing and shedding,and provide a theoretical basis for improving the viewing period of ginkgo.【Method】In this study,ginkgo biloba green leaves,light green leaves and yellow leaves were used as materials to determine the content of photosynthetic pigment,absorption spectrum and chlorophyll fluorescence parameters,analyze the change characteristics.【Result】The results showed that the contents of photosynthetic pigments in ginkgo biloba leaves decreased with the senescence and yellowing of ginkgo bilobaleaves.As the leaves turn yellow,visible light absorption decreases,and the difference in optical absorption was significant in the range of 510-710 nm.With leaf etiolation,Fv/Fm decreased significantly,at the same time the PSⅡmaximum fluorescent(Fm)and the number of reaction centers per unit area(RC/CSm)reduced significantly.【Conclusion】During the senescence process,the pigment protein complex of ginkgo leaves disintegrates,the pigment is dispersed,and the characteristics of yellowing leaves may be beneficial to increase the temperature of the leaves during the day,and help the decomposition and transport of the contents of the leaves.
作者
王艺斐
姜泽东
张敖
计舒文
何梦原
朱延姝
WANG Yi-fei;JIANG Ze-dong;ZHANG Ao;JI Shu-wen;HE Meng-yuan;ZHU Yan-shu(College of Bioscience and Biotechnology,Shenyang Agricultural University,Liaoning Shenyang 110866,China)
出处
《西南农业学报》
CSCD
北大核心
2020年第10期2220-2224,共5页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(31201141)。
关键词
银杏
黄化
吸收光谱
叶绿素荧光参数
类胡萝卜素
Ginkgo biloba L.
Etiolation
Absorption spectrum
Chlorophyll fluorescence parameters
Carotenoid
