目的:对新疆产准噶尔大戟根的化学成分进行研究。方法:通过反复硅胶柱色谱,硅胶薄层制备以及凝胶柱色谱等方法分离纯化化合物,利用核磁共振等解析化合物结构。结果:从正丁醇部分分离得到了10个化合物:鞣花酸(ellagic ac id)(1),3,3′-...目的:对新疆产准噶尔大戟根的化学成分进行研究。方法:通过反复硅胶柱色谱,硅胶薄层制备以及凝胶柱色谱等方法分离纯化化合物,利用核磁共振等解析化合物结构。结果:从正丁醇部分分离得到了10个化合物:鞣花酸(ellagic ac id)(1),3,3′-二甲基鞣花酸(3,3-′d i-O-m ethylellagic ac id)(2),3,3′-二甲基鞣花酸-4′-O-α-D-阿拉伯糖苷(3,3-′d i-O-m ethylellagic ac id-4′-O-α-D-arab infuranoside)(3),3,3′-二甲基鞣花酸-4′-O-β-D-木糖苷(3,3-′d i-O-m ethylellagic ac id-4′-O--βD-xylopyranoside)(4),3,3′-二甲基鞣花酸-4-O-β-D-葡萄糖苷(3,3-′d i-O-m ethylellagicac id-4-O--βD-glucopyranoside)(5),3,3,′4′-三甲基鞣花酸(3,3,′4-′tri-O-m ethylellagic ac id)(6),3-甲基鞣花酸-4′-O-β-D-木糖苷(3-O-m ethylellagic ac id-4′-O-β-D-xylopyranoside)(7),3,3,′4-三甲基鞣花酸-4′-O-β-D-葡萄糖苷(3,3,′4-tri-O-m ethylellagic ac id-4′-O--βD-glucopyranoside)(8),短叶苏木酚(brevifolin)(9)和短叶苏木酚酸乙酯(ethyl brevi-folin carboxylate)(10)。结论:上述化合物均首次从该植物中分离得到。展开更多
In the field of phylogenetic analyses, the rbcL gene encoded large subunit Ribulose-1,5-biphosphate carboxylase/oxygenase （Rubisco, EC4.1.1.39）, which plays a crucial role in the process of photosynthesis for most ...In the field of phylogenetic analyses, the rbcL gene encoded large subunit Ribulose-1,5-biphosphate carboxylase/oxygenase （Rubisco, EC4.1.1.39）, which plays a crucial role in the process of photosynthesis for most terrestrial plants, has been considered to be conserved; however, recent controversy regarding rbcL conservation has appeared since it was proposed to be under natural selection within all principal lineages of land plants. In this study, by examining the variation of DNA and protein sequences among 17 species in the family Tamaricaceae, three nonsynonymous mutations were identified to be under positive selection. The favored sites were located in the alph-helix domains of Rubisco, with decreased hydrophobicity and increased entropy, which could facilitate C〇 2 penetration into the active site of Rubisco. We also found that the expression level of rbcL in different genotypes of Reaumuria soongarica shifted in response to various stresses such as drought, temperature, salt, and light. This study not only sheds light on the functional/structural features of Rubisco in the evolution scenarios from 〇 3-like into C4 in Tamaricaceae but also provides useful information on directing genetic performance to enhance photosynthesis efficiency of desert plants for sustaining fragile desert ecosystems; fur-thermore, it promotes the ability to cope with desert aridification and global warming.展开更多
文摘目的:对新疆产准噶尔大戟根的化学成分进行研究。方法:通过反复硅胶柱色谱,硅胶薄层制备以及凝胶柱色谱等方法分离纯化化合物,利用核磁共振等解析化合物结构。结果:从正丁醇部分分离得到了10个化合物:鞣花酸(ellagic ac id)(1),3,3′-二甲基鞣花酸(3,3-′d i-O-m ethylellagic ac id)(2),3,3′-二甲基鞣花酸-4′-O-α-D-阿拉伯糖苷(3,3-′d i-O-m ethylellagic ac id-4′-O-α-D-arab infuranoside)(3),3,3′-二甲基鞣花酸-4′-O-β-D-木糖苷(3,3-′d i-O-m ethylellagic ac id-4′-O--βD-xylopyranoside)(4),3,3′-二甲基鞣花酸-4-O-β-D-葡萄糖苷(3,3-′d i-O-m ethylellagicac id-4-O--βD-glucopyranoside)(5),3,3,′4′-三甲基鞣花酸(3,3,′4-′tri-O-m ethylellagic ac id)(6),3-甲基鞣花酸-4′-O-β-D-木糖苷(3-O-m ethylellagic ac id-4′-O-β-D-xylopyranoside)(7),3,3,′4-三甲基鞣花酸-4′-O-β-D-葡萄糖苷(3,3,′4-tri-O-m ethylellagic ac id-4′-O--βD-glucopyranoside)(8),短叶苏木酚(brevifolin)(9)和短叶苏木酚酸乙酯(ethyl brevi-folin carboxylate)(10)。结论:上述化合物均首次从该植物中分离得到。
基金supported by the National Natural Science Foundation of China(NSFC,Grant Nos.31370395 and 31500266)the"One Hundred Talents"project of the Chinese Academy of Sciences(Grant No.29Y127E71)
文摘In the field of phylogenetic analyses, the rbcL gene encoded large subunit Ribulose-1,5-biphosphate carboxylase/oxygenase （Rubisco, EC4.1.1.39）, which plays a crucial role in the process of photosynthesis for most terrestrial plants, has been considered to be conserved; however, recent controversy regarding rbcL conservation has appeared since it was proposed to be under natural selection within all principal lineages of land plants. In this study, by examining the variation of DNA and protein sequences among 17 species in the family Tamaricaceae, three nonsynonymous mutations were identified to be under positive selection. The favored sites were located in the alph-helix domains of Rubisco, with decreased hydrophobicity and increased entropy, which could facilitate C〇 2 penetration into the active site of Rubisco. We also found that the expression level of rbcL in different genotypes of Reaumuria soongarica shifted in response to various stresses such as drought, temperature, salt, and light. This study not only sheds light on the functional/structural features of Rubisco in the evolution scenarios from 〇 3-like into C4 in Tamaricaceae but also provides useful information on directing genetic performance to enhance photosynthesis efficiency of desert plants for sustaining fragile desert ecosystems; fur-thermore, it promotes the ability to cope with desert aridification and global warming.
