PAP2(Production of anthocyanin pigment 2)编码MYB转录因子,与bHLH、WD40形成MYB-bHLH-WD40复合体来调控花青素合成。本研究从埃塞俄比亚芥和黑芥中分别克隆出2个和1个PAP2基因拷贝,分别命名为BcaB.PAP2、BcaC.PAP2、BniB.PAP2,这三...PAP2(Production of anthocyanin pigment 2)编码MYB转录因子,与bHLH、WD40形成MYB-bHLH-WD40复合体来调控花青素合成。本研究从埃塞俄比亚芥和黑芥中分别克隆出2个和1个PAP2基因拷贝,分别命名为BcaB.PAP2、BcaC.PAP2、BniB.PAP2,这三个基因均由3个外显子和2个内含子组成,均编码247个氨基酸。基于本研究克隆的PAP2基因序列和已报道的其他芸薹属PAP2基因序列,设计了3对能分别检测A、B、C基因组PAP2基因的引物,通过等位特异PCR可以区分芸薹属禹氏三角中的6个物种PAP2的基因组来源。选取芥菜型油菜B基因组的BjuB.PAP2基因构建过表达载体,转化拟南芥,其叶片变紫,表明PAP2基因正调控花青素合成。遮光处理10天后紫叶埃塞俄比亚芥的叶片紫色变淡,花青素含量下降了41.22%。荧光定量PCR和转录组研究表明,遮光处理植株叶片中BcaB.PAP2和BcaC.PAP2表达量均下降,花青素合成的结构基因查尔酮合成酶基因(CHS)、查尔酮异构酶基因(CHI)、黄烷酮3-羟化酶基因(F3H)、二氢黄酮醇还原酶基因(DFR)、花青素合成酶基因(ANS)、类黄酮3-葡糖基转移酶基因(UFGT)等基因的表达量也下降。本研究完成了对芸薹属植物中埃塞俄比亚芥和黑芥PAP2基因的克隆,并对其进行进化分析。根据本实验中克隆及其他已报道的PAP2基因序列设计等位基因特异性PCR引物,为芸薹属种间杂交后代PAP2基因的基因组传递鉴定提供了分子标记。通过BjuB.PAP2基因转拟南芥植株结果表明PAP2基因参与花青素的积累。紫叶埃塞俄比亚芥经遮光处理后,发现BcaPAP2基因及花青素合成结构基因的表达受光照的诱导。本研究在芸薹属中克隆PAP2基因,并初步验证PAP2的功能,为进一步解析芸薹属植物花青素合成的调控机制提供参考。展开更多
Phosphorus fertilizers from less pure sedimentary sources become increasingly important, due to depletion of phosphorus from igneous rock of high quality. Consequently, robust methods with potential to remove various ...Phosphorus fertilizers from less pure sedimentary sources become increasingly important, due to depletion of phosphorus from igneous rock of high quality. Consequently, robust methods with potential to remove various types of hazardous elements are required. Among such impurities, hexavalent chromium (Cr(VI)) is very likely to become a future challenge. Different industrial ways to treat phosphate rock are currently being practised, and we have here studied how chromium behaves when using the nitro-phosphate process. The reduction mechanism of Cr (VI) in nitric acid and phosphoric acid solutions was investigated by measuring redox potential and UV-VIS spectra. The results show that Cr (VI) is not stable in strong nitric acid solutions. Reduction of Cr (VI) species decreased with decreasing temperature, NO<sub>2</sub> concentration, ionic strength and absence of light. These findings support the proposed reduction reaction:The reduction rate was observed proportional to the nitric acid decomposition: .展开更多
文摘PAP2(Production of anthocyanin pigment 2)编码MYB转录因子,与bHLH、WD40形成MYB-bHLH-WD40复合体来调控花青素合成。本研究从埃塞俄比亚芥和黑芥中分别克隆出2个和1个PAP2基因拷贝,分别命名为BcaB.PAP2、BcaC.PAP2、BniB.PAP2,这三个基因均由3个外显子和2个内含子组成,均编码247个氨基酸。基于本研究克隆的PAP2基因序列和已报道的其他芸薹属PAP2基因序列,设计了3对能分别检测A、B、C基因组PAP2基因的引物,通过等位特异PCR可以区分芸薹属禹氏三角中的6个物种PAP2的基因组来源。选取芥菜型油菜B基因组的BjuB.PAP2基因构建过表达载体,转化拟南芥,其叶片变紫,表明PAP2基因正调控花青素合成。遮光处理10天后紫叶埃塞俄比亚芥的叶片紫色变淡,花青素含量下降了41.22%。荧光定量PCR和转录组研究表明,遮光处理植株叶片中BcaB.PAP2和BcaC.PAP2表达量均下降,花青素合成的结构基因查尔酮合成酶基因(CHS)、查尔酮异构酶基因(CHI)、黄烷酮3-羟化酶基因(F3H)、二氢黄酮醇还原酶基因(DFR)、花青素合成酶基因(ANS)、类黄酮3-葡糖基转移酶基因(UFGT)等基因的表达量也下降。本研究完成了对芸薹属植物中埃塞俄比亚芥和黑芥PAP2基因的克隆,并对其进行进化分析。根据本实验中克隆及其他已报道的PAP2基因序列设计等位基因特异性PCR引物,为芸薹属种间杂交后代PAP2基因的基因组传递鉴定提供了分子标记。通过BjuB.PAP2基因转拟南芥植株结果表明PAP2基因参与花青素的积累。紫叶埃塞俄比亚芥经遮光处理后,发现BcaPAP2基因及花青素合成结构基因的表达受光照的诱导。本研究在芸薹属中克隆PAP2基因,并初步验证PAP2的功能,为进一步解析芸薹属植物花青素合成的调控机制提供参考。
文摘Phosphorus fertilizers from less pure sedimentary sources become increasingly important, due to depletion of phosphorus from igneous rock of high quality. Consequently, robust methods with potential to remove various types of hazardous elements are required. Among such impurities, hexavalent chromium (Cr(VI)) is very likely to become a future challenge. Different industrial ways to treat phosphate rock are currently being practised, and we have here studied how chromium behaves when using the nitro-phosphate process. The reduction mechanism of Cr (VI) in nitric acid and phosphoric acid solutions was investigated by measuring redox potential and UV-VIS spectra. The results show that Cr (VI) is not stable in strong nitric acid solutions. Reduction of Cr (VI) species decreased with decreasing temperature, NO<sub>2</sub> concentration, ionic strength and absence of light. These findings support the proposed reduction reaction:The reduction rate was observed proportional to the nitric acid decomposition: .