Plants continuously monitor environmental conditions （such as light and temperature） and adjust their growth and development accordingly. The transcription factor PHYTOCHROME-INTERACTING FACTOR4 （PIF4） regulates b...Plants continuously monitor environmental conditions （such as light and temperature） and adjust their growth and development accordingly. The transcription factor PHYTOCHROME-INTERACTING FACTOR4 （PIF4） regulates both light and temperature signaling pathways. Here, we identified ENHANCED PHOTOMORPHOGENIC2 （EPP2） as a new repressor of photomorphogenesis in red, far-red, and blue light. Map-based cloning revealed that EPP2 encodes the SEUSS （SEU） transcription regulator. The C terminus of SEU has transcriptional activation activity, and SEU physically interacts with PIF4. Moreover, SEU promotes the expression of many genes, including auxin biosynthetic and responsive genes, and regulates IAA levels in plants. SEU associates with the regulatory regions of INDOLE-3-ACETIC ACID INDUCIBLE6 （IAA6） and IAA 19 in a PIF4-independent manner, whereas the binding of PIF4to these genes requires SEU. Furthermore, muta- tions in SEU affect H3K4me3 methylation at IAA6 and IAA 19, and SEU positively regulates warm temperature- mediated hypocotyl growth together with PIF4. Collectively, our results reveal that SEU acts as a central regulator integrating light and temperature signals to control plant growth by coordinating with PIF4.展开更多
目的:建立高效液相色谱法同时测定金胆片中4种主要活性成分含量的方法。方法:采用Agilent Eclipse X DB C_(18)(4.6 mm×250 mm,5μm)色谱柱;以乙腈(A)-0.1%磷酸溶液(B)为流动相梯度洗脱,检测波长为270 nm;柱温为30℃;流速1.0 mL•mi...目的:建立高效液相色谱法同时测定金胆片中4种主要活性成分含量的方法。方法:采用Agilent Eclipse X DB C_(18)(4.6 mm×250 mm,5μm)色谱柱;以乙腈(A)-0.1%磷酸溶液(B)为流动相梯度洗脱,检测波长为270 nm;柱温为30℃;流速1.0 mL•min^(-1)。结果:龙胆苦苷、虎杖苷、槲皮素和大黄素质量浓度分别在7.875~78.75μg•mL^(-1)(r=0.9999)、6.75~67.50μg•mL^(-1)(r=0.9997)、7.726~77.26μg•mL^(-1)(r=0.9994)、3.809~38.09μg•mL^(-1)(r=0.9998)范围内与峰面积呈良好的线性关系,平均加样回收率分别为99.31%、99.21%、99.04%、99.59%(n=6),RSD分别为1.86%、1.24%、1.37%、1.15%。结论:该实验方法准确性可靠、重复性和稳定性良好,专属性强,可为金胆片的质量控制和标准提升提供参考依据。展开更多
文摘Plants continuously monitor environmental conditions （such as light and temperature） and adjust their growth and development accordingly. The transcription factor PHYTOCHROME-INTERACTING FACTOR4 （PIF4） regulates both light and temperature signaling pathways. Here, we identified ENHANCED PHOTOMORPHOGENIC2 （EPP2） as a new repressor of photomorphogenesis in red, far-red, and blue light. Map-based cloning revealed that EPP2 encodes the SEUSS （SEU） transcription regulator. The C terminus of SEU has transcriptional activation activity, and SEU physically interacts with PIF4. Moreover, SEU promotes the expression of many genes, including auxin biosynthetic and responsive genes, and regulates IAA levels in plants. SEU associates with the regulatory regions of INDOLE-3-ACETIC ACID INDUCIBLE6 （IAA6） and IAA 19 in a PIF4-independent manner, whereas the binding of PIF4to these genes requires SEU. Furthermore, muta- tions in SEU affect H3K4me3 methylation at IAA6 and IAA 19, and SEU positively regulates warm temperature- mediated hypocotyl growth together with PIF4. Collectively, our results reveal that SEU acts as a central regulator integrating light and temperature signals to control plant growth by coordinating with PIF4.
文摘目的:建立高效液相色谱法同时测定金胆片中4种主要活性成分含量的方法。方法:采用Agilent Eclipse X DB C_(18)(4.6 mm×250 mm,5μm)色谱柱;以乙腈(A)-0.1%磷酸溶液(B)为流动相梯度洗脱,检测波长为270 nm;柱温为30℃;流速1.0 mL•min^(-1)。结果:龙胆苦苷、虎杖苷、槲皮素和大黄素质量浓度分别在7.875~78.75μg•mL^(-1)(r=0.9999)、6.75~67.50μg•mL^(-1)(r=0.9997)、7.726~77.26μg•mL^(-1)(r=0.9994)、3.809~38.09μg•mL^(-1)(r=0.9998)范围内与峰面积呈良好的线性关系,平均加样回收率分别为99.31%、99.21%、99.04%、99.59%(n=6),RSD分别为1.86%、1.24%、1.37%、1.15%。结论:该实验方法准确性可靠、重复性和稳定性良好,专属性强,可为金胆片的质量控制和标准提升提供参考依据。
