甘蓝型油菜子叶黄化致死直接影响油菜出苗率和成苗率,深入研究子叶黄化致死的分子机制可为探究植物生理相关的基础研究提供便利。本文报道了甘蓝型油菜子叶黄化致死突变体ytl(yellow to lethal)的基因定位及候选基因预测结果。该突变体...甘蓝型油菜子叶黄化致死直接影响油菜出苗率和成苗率,深入研究子叶黄化致死的分子机制可为探究植物生理相关的基础研究提供便利。本文报道了甘蓝型油菜子叶黄化致死突变体ytl(yellow to lethal)的基因定位及候选基因预测结果。该突变体来自恢复系轮回选择群体的自交后代株系,发芽出土后子叶一直处于黄化状态,播种9~15 d后死亡。与野生型相比,突变体ytl的叶绿素、叶黄素含量显著降低。透射电镜观察显示,突变体叶绿体发育仍处于质体阶段,类囊体基粒片层模糊。遗传分析表明,该突变体由一对隐性核基因控制。利用油菜60K SNP芯片结合分子标记技术将该基因定位于C09染色体的标记SSR-140和标记PBZIN-1之间198 kb的物理区间。该研究为进一步克隆基因BnaC09.YTL及后续的功能研究奠定了基础。展开更多
The enzyme activities of phenylalanine ammonia-lyase from six years old Ginkgo biloba leaves in the potted orchard were induced by four groups of metal ions respectively. The PAL activities and flavonoids content were...The enzyme activities of phenylalanine ammonia-lyase from six years old Ginkgo biloba leaves in the potted orchard were induced by four groups of metal ions respectively. The PAL activities and flavonoids content were measured by the UV-Vis spectrophotometer. Changes of the whole year were also studied. The results showed that four groups of metal ion treatments had significant effects on the PAL activities and flavonoids contents in Ginkgo leaves. The treatments with 0.1% and 0.3% FeSO4, 0.1%, 0.2% and 0.3% ZnSO4, 0.1%, 0.3% and 0.5% MnSO4, 0.1% and 0.4% CuSO4 not only enhanced flavonoids contents, but also extended the optimum harvest dates of ginkgo leaves. The optimum combination was 0.1% FeSO4, 0.2% ZnSO4, 0.3% MnSO4, and 0.4% CuSO4. It could improve flavonoids content up to 1.619 4%.展开更多
Tomato yellow leaf curl virus （TYLCV）, belonging to the genus Begomovirus of the family Geminiviridae, is emerging as the most destructive pathogen of tomato plants. Since the first report of TYLCV in Shanghai, Chin...Tomato yellow leaf curl virus （TYLCV）, belonging to the genus Begomovirus of the family Geminiviridae, is emerging as the most destructive pathogen of tomato plants. Since the first report of TYLCV in Shanghai, China in 2006, TYLCV has spread rapidly to 13 provinces or autonomous regions of China. In this study, the molecular varia- bility and evolution of TYLCV were monitored in Shanghai from its first upsurge in 2006 until 2010. Full-length genomic sequences of 26 isolates were obtained by rolling circle amplification. Sequence analysis showed that the intergenic region was the most variable, with a mean mutation rate of 4.81×10-3 nucleotide substitutions per site per year. Ge- netic differentiation was found within isolates obtained from 2006, 2009, and 2010, though a linear increase in genetic diversity over time was not evident. Whilst significant parts of TYLCV genes were under negative selection, the C4 gene embedded entirely within the C1 gene had a tendency to undergo positive selection. Our results indicate that a mechanism of independent evolution of overlapping regions could apply to the natural population of TYLCV in Shanghai, China.展开更多
基金Acknowledgments： This work was funded by the New Century Talent Support Program （No. NCET-04-0746） and the Region Technology Development Program of Chinese Ministry of Education （No. 02095）, and the Natural Science Foundation of Hubei province （No. 2002AB094）, the Youth Talent Foundation of Hubei province （No. 2003AB014） and the Educational Office Key Research Program of Hubei Province of China （No. Z200627002）.
文摘The enzyme activities of phenylalanine ammonia-lyase from six years old Ginkgo biloba leaves in the potted orchard were induced by four groups of metal ions respectively. The PAL activities and flavonoids content were measured by the UV-Vis spectrophotometer. Changes of the whole year were also studied. The results showed that four groups of metal ion treatments had significant effects on the PAL activities and flavonoids contents in Ginkgo leaves. The treatments with 0.1% and 0.3% FeSO4, 0.1%, 0.2% and 0.3% ZnSO4, 0.1%, 0.3% and 0.5% MnSO4, 0.1% and 0.4% CuSO4 not only enhanced flavonoids contents, but also extended the optimum harvest dates of ginkgo leaves. The optimum combination was 0.1% FeSO4, 0.2% ZnSO4, 0.3% MnSO4, and 0.4% CuSO4. It could improve flavonoids content up to 1.619 4%.
基金supported by the Special Fund for Agro-Scientific Research in the Public Interest from the Ministry of Agriculture,China(No.201003065)the China Postdoctoral Science Foundation(No.2012M510200)the National Natural Science Foundation of China(No.31200117)
文摘Tomato yellow leaf curl virus （TYLCV）, belonging to the genus Begomovirus of the family Geminiviridae, is emerging as the most destructive pathogen of tomato plants. Since the first report of TYLCV in Shanghai, China in 2006, TYLCV has spread rapidly to 13 provinces or autonomous regions of China. In this study, the molecular varia- bility and evolution of TYLCV were monitored in Shanghai from its first upsurge in 2006 until 2010. Full-length genomic sequences of 26 isolates were obtained by rolling circle amplification. Sequence analysis showed that the intergenic region was the most variable, with a mean mutation rate of 4.81×10-3 nucleotide substitutions per site per year. Ge- netic differentiation was found within isolates obtained from 2006, 2009, and 2010, though a linear increase in genetic diversity over time was not evident. Whilst significant parts of TYLCV genes were under negative selection, the C4 gene embedded entirely within the C1 gene had a tendency to undergo positive selection. Our results indicate that a mechanism of independent evolution of overlapping regions could apply to the natural population of TYLCV in Shanghai, China.
