Microfibril angles of bamboo cell wall in different part of culm have been measured by using X ray diffraction(002)peaks. Its distribution shows that:(1)microfibril angle increases slightly along radial direction from...Microfibril angles of bamboo cell wall in different part of culm have been measured by using X ray diffraction(002)peaks. Its distribution shows that:(1)microfibril angle increases slightly along radial direction from the culm’s surface to its interior part. The Ansade Cortex consists of amorphous material.(2)The microfibril angles of the different parts along vertical direction in the same internode are the same.(3)The relationship between microfibril angle( θ ) and internode length( L) can be satisfactorily expressed as: L=b cos θ+a , in which \%a, b\% is constant respectively.展开更多
利用PCR扩增产物直接测序的方法分析广义青篱竹属 (Arundinaria)中有关争议类群的代表种或模式种 (毛竹为外类群 )等 18种竹种的核糖体DNA内转录间隔区 (InternalTranscribedSpacers ,ITS)序列。通过最简约性分析产生的ITS系统发育树表...利用PCR扩增产物直接测序的方法分析广义青篱竹属 (Arundinaria)中有关争议类群的代表种或模式种 (毛竹为外类群 )等 18种竹种的核糖体DNA内转录间隔区 (InternalTranscribedSpacers ,ITS)序列。通过最简约性分析产生的ITS系统发育树表明 ,供试竹种形成一个自然的单系类群 ,这说明广义青篱竹属中这些不同的类群归属青篱竹属是合理的。 17种竹种可聚为 2大分支 :其中斑苦竹 (A .oleosa)、仙居苦竹 (A .hsienchuensis)、茶秆竹 (A .amabilis)、长叶苦竹 (A .chino)、苦竹 (A .amara)、宜兴苦竹 (A .yixingensis)、菲白竹 (A .fortunei)、翠竹 (A .pygmaea)为一个分支 ;而大明竹 (A .graminea)、巴山木竹 (A .fargesii)、冷箭竹 (A .faberi)、凤竹 (A .hupehense)、鼓节矢竹 (Pseudosasajaponicacv.Tsutsumiana)、矢竹 (Pseudosasajaponica)、短穗竹 (Brachystachyumdensiflorum)、肿节竹 (A .oedogonata)、少穗竹 (A .sulcata)组合在另一分支。ITS系统发育树还表明 ,大明竹与巴山木竹、鼓节矢竹与矢竹、少穗竹与短穗竹和肿节竹关系极为密切 ,均得到较高的Bootstrap(分别为 99%、10 0 %和 87% )的支持 ;茶秆竹与仙居苦竹关系非常密切 ,茶秆竹可归隶到青篱竹属中 ;翠竹和菲白竹关系密切 。展开更多
Random amplified polymorphic DAN were used to study the introgressive hybridization between Huangshan Pine(\%Pinus hwangshanensis)\% and Masson Pine (\%P.massoniana\%). The results indicated that the hybrids and intro...Random amplified polymorphic DAN were used to study the introgressive hybridization between Huangshan Pine(\%Pinus hwangshanensis)\% and Masson Pine (\%P.massoniana\%). The results indicated that the hybrids and introgression existed in the overlap zone between two species. The backcross mainly occured between the hybrids and Masson Pine.展开更多
文摘Microfibril angles of bamboo cell wall in different part of culm have been measured by using X ray diffraction(002)peaks. Its distribution shows that:(1)microfibril angle increases slightly along radial direction from the culm’s surface to its interior part. The Ansade Cortex consists of amorphous material.(2)The microfibril angles of the different parts along vertical direction in the same internode are the same.(3)The relationship between microfibril angle( θ ) and internode length( L) can be satisfactorily expressed as: L=b cos θ+a , in which \%a, b\% is constant respectively.
文摘利用PCR扩增产物直接测序的方法分析广义青篱竹属 (Arundinaria)中有关争议类群的代表种或模式种 (毛竹为外类群 )等 18种竹种的核糖体DNA内转录间隔区 (InternalTranscribedSpacers ,ITS)序列。通过最简约性分析产生的ITS系统发育树表明 ,供试竹种形成一个自然的单系类群 ,这说明广义青篱竹属中这些不同的类群归属青篱竹属是合理的。 17种竹种可聚为 2大分支 :其中斑苦竹 (A .oleosa)、仙居苦竹 (A .hsienchuensis)、茶秆竹 (A .amabilis)、长叶苦竹 (A .chino)、苦竹 (A .amara)、宜兴苦竹 (A .yixingensis)、菲白竹 (A .fortunei)、翠竹 (A .pygmaea)为一个分支 ;而大明竹 (A .graminea)、巴山木竹 (A .fargesii)、冷箭竹 (A .faberi)、凤竹 (A .hupehense)、鼓节矢竹 (Pseudosasajaponicacv.Tsutsumiana)、矢竹 (Pseudosasajaponica)、短穗竹 (Brachystachyumdensiflorum)、肿节竹 (A .oedogonata)、少穗竹 (A .sulcata)组合在另一分支。ITS系统发育树还表明 ,大明竹与巴山木竹、鼓节矢竹与矢竹、少穗竹与短穗竹和肿节竹关系极为密切 ,均得到较高的Bootstrap(分别为 99%、10 0 %和 87% )的支持 ;茶秆竹与仙居苦竹关系非常密切 ,茶秆竹可归隶到青篱竹属中 ;翠竹和菲白竹关系密切 。
文摘Random amplified polymorphic DAN were used to study the introgressive hybridization between Huangshan Pine(\%Pinus hwangshanensis)\% and Masson Pine (\%P.massoniana\%). The results indicated that the hybrids and introgression existed in the overlap zone between two species. The backcross mainly occured between the hybrids and Masson Pine.
