[目的]分析DNA、引物,dNTPs、Taq DNA聚合酶4种因素对雷公笋SCoT-PCR扩增结果的影响,通过最优的SCoT-PCR反应体系筛选多态性引物,为雷公笋种质资源分子标记研究提供条件。[方法]以海南雷公笋为材料,采用单因素试验和正交试验方法。[结果...[目的]分析DNA、引物,dNTPs、Taq DNA聚合酶4种因素对雷公笋SCoT-PCR扩增结果的影响,通过最优的SCoT-PCR反应体系筛选多态性引物,为雷公笋种质资源分子标记研究提供条件。[方法]以海南雷公笋为材料,采用单因素试验和正交试验方法。[结果]Taq酶对雷公笋SCoT-PCR扩增的影响最大,其次是模板DNA和dNTPs,最后是引物;最优反应体系为20μL体系中40 ng DNA,0.30μmol/L引物,0.25 mmol/L dNTPs,3.00 U Taq酶。经验证,该体系获得的扩增产物清晰稳定;应用该体系从40条SCoT引物筛选出8条多态性好,且适合雷公笋扩增的引物,多态性条带占62.64%。[结论]该研究为使用SCoT分子标记技术对雷公笋开展深入研究提供了重要的理论基础和技术支持。展开更多
A century and a half ago,in the European part of Russia(Moscow),forest scientists established the first long-term observations of forests,many of which are under observation to the present day.In the twentieth century...A century and a half ago,in the European part of Russia(Moscow),forest scientists established the first long-term observations of forests,many of which are under observation to the present day.In the twentieth century,climate changes and,due to industrial development,forest areas were under air pollution.Based on observations from 157 sites,this study shows that the growth and density of Scots pine(Pinus sylvestris L.)have decreased by the end of the twentieth century.The environment has changed,and the growth and development of plantations has slowed.Pine yields(-34%stand volume)and their life expectancy(on average 50 years)have decreased.These changes are critical for forestry and for the management of forests in urban centers.Due to the decline in growth,ecosystem functions by urban forests has decreased.In order to increase the sustainability of urban forests and the provision of ecosystem services,it is preferable to create multi-species stands with a complex structure.展开更多
Microwave(MW)drying method was adopted to enhance the liquid permeability of Scots pine lumber.Structure changes were characterized by stereoscope microscope,scanned electron microscope(SEM)and transmission electron m...Microwave(MW)drying method was adopted to enhance the liquid permeability of Scots pine lumber.Structure changes were characterized by stereoscope microscope,scanned electron microscope(SEM)and transmission electron microscope(TEM)examination.Pore parameters before and after MW treatment were detected by mercury intrusion porosimetry(MIP)method,and the effect of structure changes on liquid permeability were analyzed.As stereoscope microscope,SEM and TEM examination results showed,macro and micro checks mainly developed at intercellcular of tracheids,intercellular of ray parenchyma and tracheid,while these checks extend main along the radial-longitudinal plane.Pit border destruction,aspirated pits’orus translocation and micro-checks in tracheid cell wall were also observed.MIP test shown that pore volume and pore area increased as macro and micro checks generated to form new cavities.Microstructure changes would increase the quantity of pores or enlarge the pore diameter.Liquid flow pathways increased as macro and micro checks generated,aspirated pits reopened to form new pathways;liquid flow efficiency improved as porosity,pore volume and pore diameter increased which facilitated the liquid flow.展开更多
文摘[目的]分析DNA、引物,dNTPs、Taq DNA聚合酶4种因素对雷公笋SCoT-PCR扩增结果的影响,通过最优的SCoT-PCR反应体系筛选多态性引物,为雷公笋种质资源分子标记研究提供条件。[方法]以海南雷公笋为材料,采用单因素试验和正交试验方法。[结果]Taq酶对雷公笋SCoT-PCR扩增的影响最大,其次是模板DNA和dNTPs,最后是引物;最优反应体系为20μL体系中40 ng DNA,0.30μmol/L引物,0.25 mmol/L dNTPs,3.00 U Taq酶。经验证,该体系获得的扩增产物清晰稳定;应用该体系从40条SCoT引物筛选出8条多态性好,且适合雷公笋扩增的引物,多态性条带占62.64%。[结论]该研究为使用SCoT分子标记技术对雷公笋开展深入研究提供了重要的理论基础和技术支持。
基金supported by the Russian State Agrarian University–Moscow Timiryazev Agricultural Academy。
文摘A century and a half ago,in the European part of Russia(Moscow),forest scientists established the first long-term observations of forests,many of which are under observation to the present day.In the twentieth century,climate changes and,due to industrial development,forest areas were under air pollution.Based on observations from 157 sites,this study shows that the growth and density of Scots pine(Pinus sylvestris L.)have decreased by the end of the twentieth century.The environment has changed,and the growth and development of plantations has slowed.Pine yields(-34%stand volume)and their life expectancy(on average 50 years)have decreased.These changes are critical for forestry and for the management of forests in urban centers.Due to the decline in growth,ecosystem functions by urban forests has decreased.In order to increase the sustainability of urban forests and the provision of ecosystem services,it is preferable to create multi-species stands with a complex structure.
基金supported by Key Research&Development Program of Zhejiang Province(2021C02012)Chinese National Natural Science Foundation,Study on Pore Structure and Liquid Permeate Mechanism of Moso Bamboo(31700489).
文摘Microwave(MW)drying method was adopted to enhance the liquid permeability of Scots pine lumber.Structure changes were characterized by stereoscope microscope,scanned electron microscope(SEM)and transmission electron microscope(TEM)examination.Pore parameters before and after MW treatment were detected by mercury intrusion porosimetry(MIP)method,and the effect of structure changes on liquid permeability were analyzed.As stereoscope microscope,SEM and TEM examination results showed,macro and micro checks mainly developed at intercellcular of tracheids,intercellular of ray parenchyma and tracheid,while these checks extend main along the radial-longitudinal plane.Pit border destruction,aspirated pits’orus translocation and micro-checks in tracheid cell wall were also observed.MIP test shown that pore volume and pore area increased as macro and micro checks generated to form new cavities.Microstructure changes would increase the quantity of pores or enlarge the pore diameter.Liquid flow pathways increased as macro and micro checks generated,aspirated pits reopened to form new pathways;liquid flow efficiency improved as porosity,pore volume and pore diameter increased which facilitated the liquid flow.
