【背景和目的】热休克蛋白20(Heat Shock Protein 20,HSP20)是一个重要的蛋白质家族,在植物生长发育及抗逆胁迫中发挥重要作用,目前HSP20基因在烟草中还未有广泛的研究。【方法】通过茄科数据库,利用生物信息学分析手段,确定普通烟草中H...【背景和目的】热休克蛋白20(Heat Shock Protein 20,HSP20)是一个重要的蛋白质家族,在植物生长发育及抗逆胁迫中发挥重要作用,目前HSP20基因在烟草中还未有广泛的研究。【方法】通过茄科数据库,利用生物信息学分析手段,确定普通烟草中HSP20家族成员并进行相关分析。【结果】在烟草中鉴定得到了58个HSP20家族基因,进化分析将其划分为13个亚家族,分布在13条染色体上;共线性分析表明烟草中有5对基因存在染色体片段复制;顺式作用元件分析表明NtHSP20成员上游存在生长发育、胁迫响应等多种顺式作用元件;HSP20家族基因具有显著的组织特异表达性,在根、茎中基因表达数量和表达水平较明显,在花中的表达数量和表达水平较低;qRT-PCR分析表明NtHSP20家族部分成员对干旱胁迫具有特异性响应,且在不同的胁迫阶段不同基因表达量有显著差异。【结论】该研究为后续烟草HSP20家族生长发育和抗逆胁迫等机理研究奠定了基础。展开更多
Analysis of the gene expression differentiation in leaves of wheat （Triticum aestivum L.） cultivar Baofeng 7228, under salt stress, was carried out by Differential-Display Reverse Transcription-polymerase Chain Reac...Analysis of the gene expression differentiation in leaves of wheat （Triticum aestivum L.） cultivar Baofeng 7228, under salt stress, was carried out by Differential-Display Reverse Transcription-polymerase Chain Reaction （DDRT-PCR.） Twenty-seven differential cDNA fragments were obtained. The expression of the SR07 fragment was induced noticeably by salt treatment, and the nucleotide sequence homology of 87% between the SR07 fragment and PIPs （water channel proteins） was observed. Further research showed that a 561 bp open read frame was present in the SR07 fragment. Plant expression vector of pCAMBIA-SR07 was constructed and three transformants of tobacco （Nicotiana tobacum） mediated by Agrobacterium tumefaciens plasmid were obtained. Resistance to salt, PEG, and mannitol stresses of the three transformants were examined. No significant difference （P 〉 0.05） was observed between the control and the transformants in resistance to salt stress, but there was significant difference （P 〈 0.05） between the control and the transformants in resistance to PEG and mannitol stresses. Therefore, the expression of the SR07 fragment may play an important role in the water regulation of the plant.展开更多
文摘【背景和目的】热休克蛋白20(Heat Shock Protein 20,HSP20)是一个重要的蛋白质家族,在植物生长发育及抗逆胁迫中发挥重要作用,目前HSP20基因在烟草中还未有广泛的研究。【方法】通过茄科数据库,利用生物信息学分析手段,确定普通烟草中HSP20家族成员并进行相关分析。【结果】在烟草中鉴定得到了58个HSP20家族基因,进化分析将其划分为13个亚家族,分布在13条染色体上;共线性分析表明烟草中有5对基因存在染色体片段复制;顺式作用元件分析表明NtHSP20成员上游存在生长发育、胁迫响应等多种顺式作用元件;HSP20家族基因具有显著的组织特异表达性,在根、茎中基因表达数量和表达水平较明显,在花中的表达数量和表达水平较低;qRT-PCR分析表明NtHSP20家族部分成员对干旱胁迫具有特异性响应,且在不同的胁迫阶段不同基因表达量有显著差异。【结论】该研究为后续烟草HSP20家族生长发育和抗逆胁迫等机理研究奠定了基础。
基金This work was supported by the Foundation of Technological Department of Shaanxi Province (No. 06JK267)Basic Research Foundation of Xi’an University of Architecture & Technology (No. JC0507)
文摘Analysis of the gene expression differentiation in leaves of wheat （Triticum aestivum L.） cultivar Baofeng 7228, under salt stress, was carried out by Differential-Display Reverse Transcription-polymerase Chain Reaction （DDRT-PCR.） Twenty-seven differential cDNA fragments were obtained. The expression of the SR07 fragment was induced noticeably by salt treatment, and the nucleotide sequence homology of 87% between the SR07 fragment and PIPs （water channel proteins） was observed. Further research showed that a 561 bp open read frame was present in the SR07 fragment. Plant expression vector of pCAMBIA-SR07 was constructed and three transformants of tobacco （Nicotiana tobacum） mediated by Agrobacterium tumefaciens plasmid were obtained. Resistance to salt, PEG, and mannitol stresses of the three transformants were examined. No significant difference （P 〉 0.05） was observed between the control and the transformants in resistance to salt stress, but there was significant difference （P 〈 0.05） between the control and the transformants in resistance to PEG and mannitol stresses. Therefore, the expression of the SR07 fragment may play an important role in the water regulation of the plant.
