翻白叶树是中国南方的常绿树种,具有重要的经济和药用价值。通过Illumina HiSeq X ten高通量测序平台,对翻白叶树叶绿体基因组进行测序、组装和注释,分析翻白叶树的叶绿体基因组特征及系统发育关系。结果表明,翻白叶树叶绿体全基因组具...翻白叶树是中国南方的常绿树种,具有重要的经济和药用价值。通过Illumina HiSeq X ten高通量测序平台,对翻白叶树叶绿体基因组进行测序、组装和注释,分析翻白叶树的叶绿体基因组特征及系统发育关系。结果表明,翻白叶树叶绿体全基因组具有典型的四分体结构,全长为162843 bp,共注释126个基因,其中包括81个蛋白编码基因、37个tRNA和8个rRNA。密码子偏好性分析表明,翻白叶树的密码子使用模式偏向以A或U结尾,亮氨酸(Leu)密码子使用频率最高,半胱氨酸(Cys)使用率最低。重复序列分析共检测到284个SSR位点,其中单碱基重复的SSR位点最多,有171个,6碱基重复最少,仅有2个。翅子树属叶绿体基因组比较分析显示,反向重复区域的位置和边界区域的基因分布存在收缩与扩张的现象。系统发育分析表明,翻白叶树与景东翅子树、勐仑翅子树、截裂翅子树和蚬木亲缘关系较近。该研究为翻白叶树的分子标记开发、物种鉴定以及遗传多样性评估等研究提供重要的理论依据。展开更多
. The biomass dynamics of the pioneer Trema orientalis community in the early stages of secondary succession of tropical forest in Xishuangbanna had been studied for 5 years by the standard tree regression (for trees).... The biomass dynamics of the pioneer Trema orientalis community in the early stages of secondary succession of tropical forest in Xishuangbanna had been studied for 5 years by the standard tree regression (for trees) and clear cut method (for shrub,herb and inter layer plants). 1)The biomass distribution by organs was ranked as stems>branches>roots>leaves. 2)As the succession proceed, the percentages of stem and root biomass increased gradually, the percentage of leaves obviously decreased, and the percentage of branches fluctuated slightly; the dorminant species T. orientalis was replaced gradually by other species,that made the biomass distribution by species appeared to have a characteristics of relative dispersion;the biomass distribution by DBH class showed that biomass was mainly determined by the amounts of larger DBH class trees;the percentage of the tree biomass to the total community biomass gradually increased, the percentages of the shrub and herb layers remarkably decreased and the percentage of the inter-layer plants increased slightly .展开更多
The seed oil from \%Althaea rosea \%(L.) Caven was extracted with Hexane. After saponification and formation, the oil was determined by Capillary GC\|MS. 16 compounds have been determined and its unsaturation is 72.59...The seed oil from \%Althaea rosea \%(L.) Caven was extracted with Hexane. After saponification and formation, the oil was determined by Capillary GC\|MS. 16 compounds have been determined and its unsaturation is 72.59%. Among them the content of linoleic acid is 69.24%.展开更多
文摘翻白叶树是中国南方的常绿树种,具有重要的经济和药用价值。通过Illumina HiSeq X ten高通量测序平台,对翻白叶树叶绿体基因组进行测序、组装和注释,分析翻白叶树的叶绿体基因组特征及系统发育关系。结果表明,翻白叶树叶绿体全基因组具有典型的四分体结构,全长为162843 bp,共注释126个基因,其中包括81个蛋白编码基因、37个tRNA和8个rRNA。密码子偏好性分析表明,翻白叶树的密码子使用模式偏向以A或U结尾,亮氨酸(Leu)密码子使用频率最高,半胱氨酸(Cys)使用率最低。重复序列分析共检测到284个SSR位点,其中单碱基重复的SSR位点最多,有171个,6碱基重复最少,仅有2个。翅子树属叶绿体基因组比较分析显示,反向重复区域的位置和边界区域的基因分布存在收缩与扩张的现象。系统发育分析表明,翻白叶树与景东翅子树、勐仑翅子树、截裂翅子树和蚬木亲缘关系较近。该研究为翻白叶树的分子标记开发、物种鉴定以及遗传多样性评估等研究提供重要的理论依据。
文摘. The biomass dynamics of the pioneer Trema orientalis community in the early stages of secondary succession of tropical forest in Xishuangbanna had been studied for 5 years by the standard tree regression (for trees) and clear cut method (for shrub,herb and inter layer plants). 1)The biomass distribution by organs was ranked as stems>branches>roots>leaves. 2)As the succession proceed, the percentages of stem and root biomass increased gradually, the percentage of leaves obviously decreased, and the percentage of branches fluctuated slightly; the dorminant species T. orientalis was replaced gradually by other species,that made the biomass distribution by species appeared to have a characteristics of relative dispersion;the biomass distribution by DBH class showed that biomass was mainly determined by the amounts of larger DBH class trees;the percentage of the tree biomass to the total community biomass gradually increased, the percentages of the shrub and herb layers remarkably decreased and the percentage of the inter-layer plants increased slightly .
文摘The seed oil from \%Althaea rosea \%(L.) Caven was extracted with Hexane. After saponification and formation, the oil was determined by Capillary GC\|MS. 16 compounds have been determined and its unsaturation is 72.59%. Among them the content of linoleic acid is 69.24%.
