结合茶条槭转录组数据库,利用RT-PCR的方法克隆得到茶条槭SDH基因,命名为AgSDH,并对该基因及其蛋白进行了生物信息学分析。结果显示,AgSDH基因的ORF全长为1 563 bp,共编码520个氨基酸,推测蛋白相对分子量为57.219 k Da,理论等电点为5.61...结合茶条槭转录组数据库,利用RT-PCR的方法克隆得到茶条槭SDH基因,命名为AgSDH,并对该基因及其蛋白进行了生物信息学分析。结果显示,AgSDH基因的ORF全长为1 563 bp,共编码520个氨基酸,推测蛋白相对分子量为57.219 k Da,理论等电点为5.61,无信号肽,预测亚细胞定位于细胞质中。生物信息学分析表明AgSDH蛋白为亲水性蛋白,没有跨膜结构。蛋白质二级结构α-螺旋占35.38%,延伸链占18.65%,无规则卷曲占45.96%;三级结构预测表明AgSDH蛋白以单体形式存在。与目前已知的多种植物的SDH蛋白具有相似的结构功能域。系统进化分析表明,AgSDH蛋白与脐橙SDH蛋白亲缘关系最为接近。该研究结果为深入了解该基因的功能和茶条槭次生代谢产物合成的调控机理提供了基础数据。展开更多
One-year-old seedlings of Amur maple (Acer ginnala Maxim), Ussurian pear (Pyrus ussuriensis Maxim) and David peach (Prunus davidiana Carr) were planted in pots in greenhouse and treated with four different soil moistu...One-year-old seedlings of Amur maple (Acer ginnala Maxim), Ussurian pear (Pyrus ussuriensis Maxim) and David peach (Prunus davidiana Carr) were planted in pots in greenhouse and treated with four different soil moisture contents (75.0%, 61.1%, 46.4% and 35.4%). The results showed that net photosynthesis rate (NPR), transpiration rate (TR) and stomatal conductance (Sc) of seedlings of the three species decreased with the decease of soil moisture content, and Amur maple seedlings had the greatest change in those physiological indices, followed by Ussurian pear, David peach. Amur maple and Ussurian pear seedlings also presented a decrease tendency in water use efficiency (WUE) under lower soil moisture content, whereas this was reversed for David peach. Under water stress the biomass allocation to seedling root had a significant increase for all the experimental species. As to root/shoot ratio, Amur maple seedlings had the biggest increase, while David peach had the smallest increase. The leaf plasticity of Amur maple seedlings was greater, the leaf size and total leaf area decreased significantly as the stress was intensified. No significant change of leaf size and total leaf area was found in seedlings of Ussurian pear and David peach. It was concluded that Amur maple was more tolerant to soil moisture stress in comparison with David peach and Ussurian pear.展开更多
文摘结合茶条槭转录组数据库,利用RT-PCR的方法克隆得到茶条槭SDH基因,命名为AgSDH,并对该基因及其蛋白进行了生物信息学分析。结果显示,AgSDH基因的ORF全长为1 563 bp,共编码520个氨基酸,推测蛋白相对分子量为57.219 k Da,理论等电点为5.61,无信号肽,预测亚细胞定位于细胞质中。生物信息学分析表明AgSDH蛋白为亲水性蛋白,没有跨膜结构。蛋白质二级结构α-螺旋占35.38%,延伸链占18.65%,无规则卷曲占45.96%;三级结构预测表明AgSDH蛋白以单体形式存在。与目前已知的多种植物的SDH蛋白具有相似的结构功能域。系统进化分析表明,AgSDH蛋白与脐橙SDH蛋白亲缘关系最为接近。该研究结果为深入了解该基因的功能和茶条槭次生代谢产物合成的调控机理提供了基础数据。
基金This study was supported by Science and Technology Program of Heilongjiang Province (GC01KB213), and the Quick Response of Basic Research Supporting Program (2001CCB00600)
文摘One-year-old seedlings of Amur maple (Acer ginnala Maxim), Ussurian pear (Pyrus ussuriensis Maxim) and David peach (Prunus davidiana Carr) were planted in pots in greenhouse and treated with four different soil moisture contents (75.0%, 61.1%, 46.4% and 35.4%). The results showed that net photosynthesis rate (NPR), transpiration rate (TR) and stomatal conductance (Sc) of seedlings of the three species decreased with the decease of soil moisture content, and Amur maple seedlings had the greatest change in those physiological indices, followed by Ussurian pear, David peach. Amur maple and Ussurian pear seedlings also presented a decrease tendency in water use efficiency (WUE) under lower soil moisture content, whereas this was reversed for David peach. Under water stress the biomass allocation to seedling root had a significant increase for all the experimental species. As to root/shoot ratio, Amur maple seedlings had the biggest increase, while David peach had the smallest increase. The leaf plasticity of Amur maple seedlings was greater, the leaf size and total leaf area decreased significantly as the stress was intensified. No significant change of leaf size and total leaf area was found in seedlings of Ussurian pear and David peach. It was concluded that Amur maple was more tolerant to soil moisture stress in comparison with David peach and Ussurian pear.
