北京林业大学学报2024，Vol.46Issue(4)：52-62,11.DOI:10.12171/j.1000-1522.20230030
自然群体小叶杨叶绿素荧光表型变异分析
Chlorophyll fluorescence phenotypic variation in natural populations of Populus simonii
摘要
Abstract
[Objective]Through the analysis of chlorophyll fluorescence phenotypes of Populus simonii in China,we can display the diversity of chlorophyll fluorescence phenotypes in P.simonii from multiple angles,laying a foundation for the exploration of related photosynthetic genetic mechanism.[Method]According to the phenotypic data of chlorophyll fluorescence parameters of P.simonii in China,the variation law was explored by cluster analysis,phenotypic plasticity index and coefficient of variation calculation,dynamic fitting analysis and other methods.[Result](1)At a constant light intensity(same light intensity),k means clustering was applied to four chlorophyll fluorescence phenotypes of P.simonii,the optimal number of clusters was significantly influenced by light intensity.Four types of fluorescent phenotypes of P.simonii:the electron transfer rate(ETR)through photosynthetic system Ⅱ(PSⅡ),the actual light quantum yield(Yield),photochemical quenching coefficient(qP),non-photochemical quenching coefficient(qN)exhibited significant differences in different categories.(2)The calculation results of the phenotypic plasticity index and coefficient of variation of the four fluorescence parameters of P.simonii showed that the selected population had rich phenotypic plasticity under changeable resources,as the light intensity gradually increased,the phenotypic plasticity index of ETR,Yield and qN showed an overall trend of decreasing first,then increasing and then decreasing,while the phenotypic plasticity index of qN presented a decreasing trend in the whole process.This phenomenon might be related to the genetic control within each phenotype,and also reflected the different degree of response of different phenotypes to gradient light intensities;the coefficient of variation of ETR,Yield and qP showed a trend of decreasing initially and then rising with the increase of light intensity;the coefficient of variation of qN gradually decreased with the increase of light intensity,when the light intensity reached the maximum value,the coefficient of variation of all kinds of samples were less than 0.1.(3)Chlorophyll fluorescence phenotypes of P.simonii under different gradient(dynamic)light intensities can be divided into two categories after clustering.After fitting with the growth equation,it can be found that the phenotypic variation rate and the maximum(minimum)value of different categories of samples have significant differences.[Conclusion]Chlorophyll fluorescence phenotypes of P.simonii vary widely and are significantly affected by light intensity.Through methods,such as cluster analysis,phenotypic plasticity and coefficient of variation calculation and growth equation fitting,we can explore the changing rule of chlorophyll fluorescence phenotypes effectively,lay a foundation for genetic analysis and photosynthesis mechanism,and provide scientific guidance for the cultivation of P.simonii.关键词
小叶杨/叶绿素荧光表型/聚类分析/表型可塑性/变异系数/生长方程/拟合分析Key words
Populus simonii/chlorophyll fluorescence phenotypephotosynthetic trait/cluster analysis/phenotypic plasticity index(PPI)/coefficient of variation(CV)/growth equation/fitting analysis分类
农业科技引用本文复制引用
周子杨,卜琛皞,宋跃朋,张德强,张晓宇..自然群体小叶杨叶绿素荧光表型变异分析[J].北京林业大学学报,2024,46(4):52-62,11.基金项目
国家自然科学基金项目(32070601). （32070601）
