曲茎石斛(Dendrobium flexicaule Z.H.Tsi,S.C.Sun et Z.G.Xu)是中药西枫斗的原植物之一。因其生长在悬崖峭壁上,采挖十分困难,采收时连根拔起,使自然资源日益减少。为解决种源供人工栽培,近年来,我们对其进行了无性快速繁殖、培养出了...曲茎石斛(Dendrobium flexicaule Z.H.Tsi,S.C.Sun et Z.G.Xu)是中药西枫斗的原植物之一。因其生长在悬崖峭壁上,采挖十分困难,采收时连根拔起,使自然资源日益减少。为解决种源供人工栽培,近年来,我们对其进行了无性快速繁殖、培养出了大量试管苗。但大多数苗及根细小,成活困难,为解决这一问题,我们进行了选择不同激素对曲茎石斛试管生长的影响试验。现将结果报告如下。展开更多
The molecular variation of satellite DNA associated with Tobacco curly shoot virus (TbCSV) was compared by DNA sequencing of progenies of TbCSV DNA in Nicotiana benthamiana and N. glutinosa plants agroinoculated with ...The molecular variation of satellite DNA associated with Tobacco curly shoot virus (TbCSV) was compared by DNA sequencing of progenies of TbCSV DNA in Nicotiana benthamiana and N. glutinosa plants agroinoculated with infectious clones of TbCSV and its associated DNA. Comparisons indicated that TbCSV DNA populations had the higher levels of mutation frequency in N. glutinosa than that in N. benthamiana, and mutations generated in N. benthamiana were found upstream or downstream of C1 ORF whereas those in N. glutinosa were mostly located in A-rich region. No mutation was found in C1 ORF and satellite conserved region of DNA. The biological significance of the mutation accumulation and its role in disease epidemic were discussed.展开更多
文摘曲茎石斛(Dendrobium flexicaule Z.H.Tsi,S.C.Sun et Z.G.Xu)是中药西枫斗的原植物之一。因其生长在悬崖峭壁上,采挖十分困难,采收时连根拔起,使自然资源日益减少。为解决种源供人工栽培,近年来,我们对其进行了无性快速繁殖、培养出了大量试管苗。但大多数苗及根细小,成活困难,为解决这一问题,我们进行了选择不同激素对曲茎石斛试管生长的影响试验。现将结果报告如下。
文摘The molecular variation of satellite DNA associated with Tobacco curly shoot virus (TbCSV) was compared by DNA sequencing of progenies of TbCSV DNA in Nicotiana benthamiana and N. glutinosa plants agroinoculated with infectious clones of TbCSV and its associated DNA. Comparisons indicated that TbCSV DNA populations had the higher levels of mutation frequency in N. glutinosa than that in N. benthamiana, and mutations generated in N. benthamiana were found upstream or downstream of C1 ORF whereas those in N. glutinosa were mostly located in A-rich region. No mutation was found in C1 ORF and satellite conserved region of DNA. The biological significance of the mutation accumulation and its role in disease epidemic were discussed.