Seventeen morphological and anatomical characteristics of the leaves were selected from five natural populations to explore the variation in leaf traits of Lits ea core ana var.sinensis and the effects of geographical...Seventeen morphological and anatomical characteristics of the leaves were selected from five natural populations to explore the variation in leaf traits of Lits ea core ana var.sinensis and the effects of geographical environment on these variations.Nested analysis of variance,multiple comparisons,principal component analysis(PCA),and correlation analysis were conducted to explore the variations within and between populations and their correlation with geographical and climatic factors.Significant differences in the 17 leaf traits were observed within and among populations.On average,the relative contribution of within population variation to total variation was 24.8%,which was lower than among population variation(54.6%).The average differentiation coefficient of the traits was 65.8%,and the average coefficient of variation 11.8%,ranging from6.7%for main vein thickness to 21.4%for petiole length.The PC A results showed that morphological characteristics were divided into two categories,and the level of variation was greater than that of leaf anatomy.Most of the leaf traits were significantly correlated with geography and climate and showed a gradual variation with longitude,latitude,and altitude.In areas with high temperatures,less rainfall,and strong seasonal rainfall,the leaves are larger,longer and thicker.This study shows that variations in leaf traits of L.coreana var.sinensis mainly come from variations among populations.The level of trait differentiation among populations is high and the level of variation within populations low.These findings help further understand leaf morphological characteristics of this species and can provide a valuable reference for the protection and sustainable utilization of this natural resource.展开更多
Studying the dynamics of plant populations is crucial to the conservation and management of endangered plants.The diameter at breast height(DBH),tree height,crown width,and environmental factors of a total of 15 plots...Studying the dynamics of plant populations is crucial to the conservation and management of endangered plants.The diameter at breast height(DBH),tree height,crown width,and environmental factors of a total of 15 plots in five populations in Guizhou Province,China were measured in this study.The method of substituting diameter at breast height for age was used to divide the population into 7 age classes.The age structure,static life table,and relationship between the population characteristics and environmental factors of the Litsea coreana Levl.var.sinensis population were studied.Moreover,the time series model was used to predict the population dynamics.Results showed that the age structure of population in Zhengan County(Population ZA)had an inverted Jshape with abundant seedlings and insufficient middle-aged and elderly individuals.The age structures of populations in Daozhen County(Population DZ),Kaiyang County(KY),Meitan County(Population MT),and Xishui County(Population XS)were spindle-shaped with few young individuals and many middle-aged and elderly individuals.The mortality rate of each population fluctuated with the increase in age class,and the populations were extremely unstable.The survival curve was close to the Deevey III type,and the degree of deviation was related to the lack of young individuals.After the age stages II,IV,and VI,the number of aged plants in the different populations initially increased then decreased,and population stability was difficult to maintain.Redundancy analysis showed that the DBH,tree height and crown width of the population decreased with the increase of annual mean temperature,and the population density was restricted by soil nutrient conditions to a certain extent.The results of this work provide scientific basis for the conservation and sustainable utilization of natural populations of L.coreana var.sinensis in Guizhou Province,China.展开更多
目的研究豹皮樟总黄酮(litsea coteana total flavone,LCTF)对环磷酰胺(cyclophosphamide,Cy)诱导的免疫低下小鼠免疫功能的影响。方法以Cy50mg·kg-1ip给药,每天1次,连续2d,诱导小鼠免疫低下模型,采用碳廓清试验、溶血素生成试验...目的研究豹皮樟总黄酮(litsea coteana total flavone,LCTF)对环磷酰胺(cyclophosphamide,Cy)诱导的免疫低下小鼠免疫功能的影响。方法以Cy50mg·kg-1ip给药,每天1次,连续2d,诱导小鼠免疫低下模型,采用碳廓清试验、溶血素生成试验、二硝基氟苯(DNFB)诱导的迟发性超敏反应,观察LCTF对免疫低下小鼠非特异性免疫、体液免疫和细胞免疫的影响。结果碳廓清试验,LCTF(200、400mg·kg-1)组可提高Cy致免疫低下小鼠的吞噬指数α值和廓清指数K值,提高免疫低下小鼠巨噬细胞的吞噬功能;溶血素试验,LCTF(100、200mg·kg-1)组能提高免疫低下小鼠血清IgM和IgG的生成,LCTF(100、200、400mg·kg-1)能增加免疫低下小鼠脾细胞溶血素的产生;LCTF(200、400mg·kg-1)组可明显促进免疫低下小鼠DTH反应,LCTF(100、200、400mg·kg-1)能提升CD4+、CD8+细胞数以及CD4+/CD8+比值,并能提高脾淋巴细胞生产IL-2含量。结论以上结果表明,LCTF通过广泛刺激小鼠的特异性及非特异性免疫应答,对免疫低下小鼠的免疫功能有良好的增强作用。展开更多
本文采用组织匀浆MDA比色法测定了山柰酚、山柰酚 3 O β D 葡萄糖甙、槲皮素 3 O β D 葡萄糖甙三种贵州老鹰茶 (Litseacoreana)黄酮类提取物对大鼠离体心、脑、肝、肾四种组织脂质过氧化的影响 ,发现以上三种化合物均具有明显的抗...本文采用组织匀浆MDA比色法测定了山柰酚、山柰酚 3 O β D 葡萄糖甙、槲皮素 3 O β D 葡萄糖甙三种贵州老鹰茶 (Litseacoreana)黄酮类提取物对大鼠离体心、脑、肝、肾四种组织脂质过氧化的影响 ,发现以上三种化合物均具有明显的抗氧化活性 ,并呈量效关系 ,且抗氧化活性为 :山柰酚 >槲皮素 3 O β D 葡萄糖甙 >山柰酚 3 O β D 葡萄糖甙 ;以上三种物质对SD大鼠四种离体组织MDA抑制率为 :肾组织 >心组织 >肝组织 >脑组织。本文的研究结果为开发和利用贵州老鹰茶叶中黄酮类天然抗氧化剂提供了一定的科学依据。展开更多
基金the National Natural Science Foundation of China(32060349)China Scholarship Council([2021]15)。
文摘Seventeen morphological and anatomical characteristics of the leaves were selected from five natural populations to explore the variation in leaf traits of Lits ea core ana var.sinensis and the effects of geographical environment on these variations.Nested analysis of variance,multiple comparisons,principal component analysis(PCA),and correlation analysis were conducted to explore the variations within and between populations and their correlation with geographical and climatic factors.Significant differences in the 17 leaf traits were observed within and among populations.On average,the relative contribution of within population variation to total variation was 24.8%,which was lower than among population variation(54.6%).The average differentiation coefficient of the traits was 65.8%,and the average coefficient of variation 11.8%,ranging from6.7%for main vein thickness to 21.4%for petiole length.The PC A results showed that morphological characteristics were divided into two categories,and the level of variation was greater than that of leaf anatomy.Most of the leaf traits were significantly correlated with geography and climate and showed a gradual variation with longitude,latitude,and altitude.In areas with high temperatures,less rainfall,and strong seasonal rainfall,the leaves are larger,longer and thicker.This study shows that variations in leaf traits of L.coreana var.sinensis mainly come from variations among populations.The level of trait differentiation among populations is high and the level of variation within populations low.These findings help further understand leaf morphological characteristics of this species and can provide a valuable reference for the protection and sustainable utilization of this natural resource.
基金supported by the National Natural Science Foundation of China(32060349)China Scholarship Council([2021]15)。
文摘Studying the dynamics of plant populations is crucial to the conservation and management of endangered plants.The diameter at breast height(DBH),tree height,crown width,and environmental factors of a total of 15 plots in five populations in Guizhou Province,China were measured in this study.The method of substituting diameter at breast height for age was used to divide the population into 7 age classes.The age structure,static life table,and relationship between the population characteristics and environmental factors of the Litsea coreana Levl.var.sinensis population were studied.Moreover,the time series model was used to predict the population dynamics.Results showed that the age structure of population in Zhengan County(Population ZA)had an inverted Jshape with abundant seedlings and insufficient middle-aged and elderly individuals.The age structures of populations in Daozhen County(Population DZ),Kaiyang County(KY),Meitan County(Population MT),and Xishui County(Population XS)were spindle-shaped with few young individuals and many middle-aged and elderly individuals.The mortality rate of each population fluctuated with the increase in age class,and the populations were extremely unstable.The survival curve was close to the Deevey III type,and the degree of deviation was related to the lack of young individuals.After the age stages II,IV,and VI,the number of aged plants in the different populations initially increased then decreased,and population stability was difficult to maintain.Redundancy analysis showed that the DBH,tree height and crown width of the population decreased with the increase of annual mean temperature,and the population density was restricted by soil nutrient conditions to a certain extent.The results of this work provide scientific basis for the conservation and sustainable utilization of natural populations of L.coreana var.sinensis in Guizhou Province,China.
文摘目的研究豹皮樟总黄酮(litsea coteana total flavone,LCTF)对环磷酰胺(cyclophosphamide,Cy)诱导的免疫低下小鼠免疫功能的影响。方法以Cy50mg·kg-1ip给药,每天1次,连续2d,诱导小鼠免疫低下模型,采用碳廓清试验、溶血素生成试验、二硝基氟苯(DNFB)诱导的迟发性超敏反应,观察LCTF对免疫低下小鼠非特异性免疫、体液免疫和细胞免疫的影响。结果碳廓清试验,LCTF(200、400mg·kg-1)组可提高Cy致免疫低下小鼠的吞噬指数α值和廓清指数K值,提高免疫低下小鼠巨噬细胞的吞噬功能;溶血素试验,LCTF(100、200mg·kg-1)组能提高免疫低下小鼠血清IgM和IgG的生成,LCTF(100、200、400mg·kg-1)能增加免疫低下小鼠脾细胞溶血素的产生;LCTF(200、400mg·kg-1)组可明显促进免疫低下小鼠DTH反应,LCTF(100、200、400mg·kg-1)能提升CD4+、CD8+细胞数以及CD4+/CD8+比值,并能提高脾淋巴细胞生产IL-2含量。结论以上结果表明,LCTF通过广泛刺激小鼠的特异性及非特异性免疫应答,对免疫低下小鼠的免疫功能有良好的增强作用。
文摘本文采用组织匀浆MDA比色法测定了山柰酚、山柰酚 3 O β D 葡萄糖甙、槲皮素 3 O β D 葡萄糖甙三种贵州老鹰茶 (Litseacoreana)黄酮类提取物对大鼠离体心、脑、肝、肾四种组织脂质过氧化的影响 ,发现以上三种化合物均具有明显的抗氧化活性 ,并呈量效关系 ,且抗氧化活性为 :山柰酚 >槲皮素 3 O β D 葡萄糖甙 >山柰酚 3 O β D 葡萄糖甙 ;以上三种物质对SD大鼠四种离体组织MDA抑制率为 :肾组织 >心组织 >肝组织 >脑组织。本文的研究结果为开发和利用贵州老鹰茶叶中黄酮类天然抗氧化剂提供了一定的科学依据。
