Santalum album （Indian Sandalwood） is found in the mountainous regions of the intermediate zone of Sri Lanka. Few studies have been conducted on sandalwood ecology in this region, and ours is the first recorded stud...Santalum album （Indian Sandalwood） is found in the mountainous regions of the intermediate zone of Sri Lanka. Few studies have been conducted on sandalwood ecology in this region, and ours is the first recorded study of essential oil content and chemical composition of heartwood. We harvested two trees with State permission and took cross-sections for analysis. We demonstrated a difference in the heartwood formation and oil yield of the trees. The composition of the oil was found to be consistent between trees and along the trunk of the tree. Main aromatic compounds were santalols and other compounds are recorded in lesser quantities. Results of this study comply with the other published work on sandalwood elsewhere. This initial study on S. album in Sri Lanka provided promising results for the future of sandalwood agroforestry.展开更多
In the introduction and propagation of red sandalwood （Pterocarpus santalinus）, a serious leaf disease of its seedlings in winter and spring seasons was found, but the name of the disease and its pathogen species ha...In the introduction and propagation of red sandalwood （Pterocarpus santalinus）, a serious leaf disease of its seedlings in winter and spring seasons was found, but the name of the disease and its pathogen species have not been reported. The pathogen isolated from infected leaves of 18-month-old seedlings was identi- fied as Colletotrichum gloeosporioides by morphological characteristics of colony and conidium, and analysis results of rDNA-intemal transcribed spacer sequence （ITS） of the strain. Pathogenicity test results further confirmed that C. gloeosporioides was the pathogen responsible for the infected leaves symptoms of red sandal- wood. However, the disease belongs to an atypical anthraenose. Control of the leaf diseases of red sandalwood seedlings was discussed.展开更多
The African Sandalwood plant (Osyris lanceolata ) is a threatened shrub or a small hemi-parasitic tree endemic to East Africa and South African regions, which is being severely affected by uprooting for oil extraction...The African Sandalwood plant (Osyris lanceolata ) is a threatened shrub or a small hemi-parasitic tree endemic to East Africa and South African regions, which is being severely affected by uprooting for oil extraction, poor natural regeneration, phenological structures (dioecious), medicinal values, lack of sexual recruitment, habitat loss, anthropogenic and climate factors. It has been found that through application of in situ conservation of natural trees with respect to rapid human population growth, the available natural strands of valuable plants such as African sandalwood have not been able to meet the demands of the people in world specifically developing countries. However, advances in plant biotechnology provide new options for collection, multiplication and short- to long-term conservation of Osyris lanceolata species, using in vitro culture techniques. Different aspects of biotechnological applications can be extensively used to reduce the risk of extinction of this valuable plant species and to improve the quality and quantity of essential oils produced by it. Therefore, tissue culture appears to be a promising approach for the propagation and conservation of African sandalwood plant.展开更多
基金the financial support provided by Sadaharitha Plantations Ltdservices provided by Wescorp Sandalwood Ltd
文摘Santalum album （Indian Sandalwood） is found in the mountainous regions of the intermediate zone of Sri Lanka. Few studies have been conducted on sandalwood ecology in this region, and ours is the first recorded study of essential oil content and chemical composition of heartwood. We harvested two trees with State permission and took cross-sections for analysis. We demonstrated a difference in the heartwood formation and oil yield of the trees. The composition of the oil was found to be consistent between trees and along the trunk of the tree. Main aromatic compounds were santalols and other compounds are recorded in lesser quantities. Results of this study comply with the other published work on sandalwood elsewhere. This initial study on S. album in Sri Lanka provided promising results for the future of sandalwood agroforestry.
基金Supported by Natural Science Foundation of China(31270674)Innovative High School Key Research Platform of Zhaoqing University(CQ201607)
文摘In the introduction and propagation of red sandalwood （Pterocarpus santalinus）, a serious leaf disease of its seedlings in winter and spring seasons was found, but the name of the disease and its pathogen species have not been reported. The pathogen isolated from infected leaves of 18-month-old seedlings was identi- fied as Colletotrichum gloeosporioides by morphological characteristics of colony and conidium, and analysis results of rDNA-intemal transcribed spacer sequence （ITS） of the strain. Pathogenicity test results further confirmed that C. gloeosporioides was the pathogen responsible for the infected leaves symptoms of red sandal- wood. However, the disease belongs to an atypical anthraenose. Control of the leaf diseases of red sandalwood seedlings was discussed.
文摘The African Sandalwood plant (Osyris lanceolata ) is a threatened shrub or a small hemi-parasitic tree endemic to East Africa and South African regions, which is being severely affected by uprooting for oil extraction, poor natural regeneration, phenological structures (dioecious), medicinal values, lack of sexual recruitment, habitat loss, anthropogenic and climate factors. It has been found that through application of in situ conservation of natural trees with respect to rapid human population growth, the available natural strands of valuable plants such as African sandalwood have not been able to meet the demands of the people in world specifically developing countries. However, advances in plant biotechnology provide new options for collection, multiplication and short- to long-term conservation of Osyris lanceolata species, using in vitro culture techniques. Different aspects of biotechnological applications can be extensively used to reduce the risk of extinction of this valuable plant species and to improve the quality and quantity of essential oils produced by it. Therefore, tissue culture appears to be a promising approach for the propagation and conservation of African sandalwood plant.
文摘目的探讨加味丹参饮预处理是否通过调节Beclin-1和Atg5表达调控自噬抗缺血再灌注损伤大鼠心肌。方法将60只健康SD大鼠随机分为空白对照(control group,C)组、假手术(sham,S)组、缺血再灌注损伤(ischemia reperfusion injury,IRI)组、IRI+加味丹参饮(Jiawei Danshen Yin,JDY)组、IRI+JDY+自噬抑制剂(inhibitor,I)组,每组12只。通过结扎-放松大鼠左冠状动脉前降支制备心肌IRI模型。通过氯化三苯基四氮唑(TTC)染色观察心肌梗死面积率;在透射电镜下观察自噬泡;采用实时荧光定量逆转录-聚合酶链反应(reverse transcription-polymerase chain reaction,RT-PCR)方法检测心肌Beclin-1和Atg5 m RNA表达;采用蛋白质印迹(western blot)法检测心肌Beclin-1蛋白表达变化。结果 IRI+JDY组心肌梗死面积率显著低于IRI组及IRI+JDY+I组(P<0.01)。电镜结果显示,IRI+JDY组适度调节大鼠缺血再灌注损伤心肌细胞的自噬,改善心肌细胞结构。IRI组大鼠心肌细胞中Beclin-1和Atg5 m RNA表达水平及Beclin-1蛋白表达较SG组显著升高(P<0.01);IRI+JDY组、IRI+JDY+I组大鼠心肌细胞中Beclin-1和Atg5 m RNA表达水平及Beclin-1蛋白表达较IRI组显著降低(P<0.01);IRI+JDY组大鼠心肌细胞中Beclin-1和Atg5 m RNA表达水平及Beclin-1蛋白表达较IRI+JDY+I组显著升高(P<0.01)。结论加味丹参饮通过调节缺血再灌注损伤大鼠心肌细胞自噬相关基因Beclin-1和Atg5表达适度,调控缺血再灌注心肌细胞发生适度自噬,从而发挥细胞保护作用。
