Inorganic phosphate(Pi)is one of the main nutrients necessary for plant growth.Phosphate transporters mediate the acquisition,transport and recycling of phosphate,which is essential for plant growth and development.Al...Inorganic phosphate(Pi)is one of the main nutrients necessary for plant growth.Phosphate transporters mediate the acquisition,transport and recycling of phosphate,which is essential for plant growth and development.Although PHT1 has been reported in many plants at home and abroad,it is rarely studied in potato.Therefore,it is of great significance to study the PHT1 family members in order to understand the molecular response mechanism of potato in low phosphate state.In this study,a total of 6 potato PHT1 genes were identified and isolated.It was found that after the expression of different members of potato PHT1 gene,there were certain differences in amino acids and proteins,and the transmembrane domains ranged from 6 to 12.The difference in the secondary and tertiary protein structure of potato PHT1 also led to a difference in protein morphology.In addition,the expression of the PHT1 gene in potato increased obviously during 3~9 h of Pi deficiency stress.Overall,the expression levels of different genes in roots,stems and leaves are distinctly different,but the expression levels of the StPHT1;6 and StPHT1;10 genes are very high in roots,stems and leaves,indicating that these two genes may participate in the absorption of Pi in potato and play a role in Pi translocation.These two genes play a major role in the regulation of expression under short-term Pi deficiency stress.Our results provide an important reference for further understanding the evolution and function of potato phosphate transporters,and have important significance for improving the ability of potato to tolerate low Pi.展开更多
The characteristics of the South Asia high (SAH) and subtropical westerly jets in the summer of 2010 and their relationship with the changes in rainband in China were analyzed. As shown by the results, the SAH in the ...The characteristics of the South Asia high (SAH) and subtropical westerly jets in the summer of 2010 and their relationship with the changes in rainband in China were analyzed. As shown by the results, the SAH in the upper troposphere extended northward relatively late in June 2010. Correspondingly, the subtropical westerly jets on the north side of the SAH jumped northward comparatively late, thus delaying the formation of a strong divergence field in the upper air over the Yangtze-Huaihe River valley. This was one of the main causes for the late onset of plum rains in the Yangtze-Huaihe River valley. In July, there was a vertical structure consisting of upper-level divergence and low-level convergence near the subtropical westerly jets on the north side of the SAH and in the air stream dispersal area on the northeast side of the eastward-extending SAH, which was the dynamic mechanism bringing about frequent and extremely heavy rainstorms during the plum rain period in this year. The SAH in the upper troposphere affected the subtropical high in the lower stratosphere, and thereby led to changes in the main rainband location in China.展开更多
The pursuit of high-performance narrowband blue organic light-emitting diodes(OLEDs)is of paramount importance in both academic research and industrial applications.While obvious strides have been made in the design o...The pursuit of high-performance narrowband blue organic light-emitting diodes(OLEDs)is of paramount importance in both academic research and industrial applications.While obvious strides have been made in the design of narrowband blue emitters,the development of appropriate host materials has evidently trailed behind.Herein,we introduce a medium-ring strategy for crafting host molecules based on the heptagonal tribenzo[b,d,f]azepine(TBA)unit.The twisted three-dimensional(3D)architecture of the TBA framework not only endows the host molecules with fast hole-transporting pathways but also effectively reduces exciton quenching.Equipped with two TBA units,DTBA,synthesized with ease,demonstrates a huge horizontal orientation factor(Θ//)of 93.5%and a broad emission spectrum for accelerating the energy transfer process in the emitting layer,which contributes to enhancing device performance.We have fabricated high-performance narrowband blue OLEDs using DTBA as the host,FIrpic as the phosphor sensitizer,and the widely used boron-nitrogen-containing multiple resonance emitter BCz-BN.These devices exhibit a maximum external quantum efficiency(EQEmax)as high as 31.0%with an impressively lowefficiency roll-off.Even at a high luminance level of 10,000 cd m^(-2),the EQE value remains noteworthy at 20.3%,marking a significant advancement in BCz-BN-based devices.展开更多
基金supported by the National Natural Science Foundation of China(31460367).
文摘Inorganic phosphate(Pi)is one of the main nutrients necessary for plant growth.Phosphate transporters mediate the acquisition,transport and recycling of phosphate,which is essential for plant growth and development.Although PHT1 has been reported in many plants at home and abroad,it is rarely studied in potato.Therefore,it is of great significance to study the PHT1 family members in order to understand the molecular response mechanism of potato in low phosphate state.In this study,a total of 6 potato PHT1 genes were identified and isolated.It was found that after the expression of different members of potato PHT1 gene,there were certain differences in amino acids and proteins,and the transmembrane domains ranged from 6 to 12.The difference in the secondary and tertiary protein structure of potato PHT1 also led to a difference in protein morphology.In addition,the expression of the PHT1 gene in potato increased obviously during 3~9 h of Pi deficiency stress.Overall,the expression levels of different genes in roots,stems and leaves are distinctly different,but the expression levels of the StPHT1;6 and StPHT1;10 genes are very high in roots,stems and leaves,indicating that these two genes may participate in the absorption of Pi in potato and play a role in Pi translocation.These two genes play a major role in the regulation of expression under short-term Pi deficiency stress.Our results provide an important reference for further understanding the evolution and function of potato phosphate transporters,and have important significance for improving the ability of potato to tolerate low Pi.
文摘The characteristics of the South Asia high (SAH) and subtropical westerly jets in the summer of 2010 and their relationship with the changes in rainband in China were analyzed. As shown by the results, the SAH in the upper troposphere extended northward relatively late in June 2010. Correspondingly, the subtropical westerly jets on the north side of the SAH jumped northward comparatively late, thus delaying the formation of a strong divergence field in the upper air over the Yangtze-Huaihe River valley. This was one of the main causes for the late onset of plum rains in the Yangtze-Huaihe River valley. In July, there was a vertical structure consisting of upper-level divergence and low-level convergence near the subtropical westerly jets on the north side of the SAH and in the air stream dispersal area on the northeast side of the eastward-extending SAH, which was the dynamic mechanism bringing about frequent and extremely heavy rainstorms during the plum rain period in this year. The SAH in the upper troposphere affected the subtropical high in the lower stratosphere, and thereby led to changes in the main rainband location in China.
基金supported by the National Natural Science Foundation of China(22031007,22275127)。
文摘The pursuit of high-performance narrowband blue organic light-emitting diodes(OLEDs)is of paramount importance in both academic research and industrial applications.While obvious strides have been made in the design of narrowband blue emitters,the development of appropriate host materials has evidently trailed behind.Herein,we introduce a medium-ring strategy for crafting host molecules based on the heptagonal tribenzo[b,d,f]azepine(TBA)unit.The twisted three-dimensional(3D)architecture of the TBA framework not only endows the host molecules with fast hole-transporting pathways but also effectively reduces exciton quenching.Equipped with two TBA units,DTBA,synthesized with ease,demonstrates a huge horizontal orientation factor(Θ//)of 93.5%and a broad emission spectrum for accelerating the energy transfer process in the emitting layer,which contributes to enhancing device performance.We have fabricated high-performance narrowband blue OLEDs using DTBA as the host,FIrpic as the phosphor sensitizer,and the widely used boron-nitrogen-containing multiple resonance emitter BCz-BN.These devices exhibit a maximum external quantum efficiency(EQEmax)as high as 31.0%with an impressively lowefficiency roll-off.Even at a high luminance level of 10,000 cd m^(-2),the EQE value remains noteworthy at 20.3%,marking a significant advancement in BCz-BN-based devices.
