The left-lateral Altyn Tagh Fault(ATF) system is the northern boundary of the Qinghai-Xizang Plateau, separating the Tarim Basin and the Qaidam Basin. The middle section of ATF has not recorded any large earthquakes s...The left-lateral Altyn Tagh Fault(ATF) system is the northern boundary of the Qinghai-Xizang Plateau, separating the Tarim Basin and the Qaidam Basin. The middle section of ATF has not recorded any large earthquakes since1598 AD, so the potential seismic hazard is unclear. We develope an earthquake catalog using continuous waveform data recorded by the Tarim-Altyn-Qaidam dense nodal seismic array from September 17 to November23, 2021 in the middle section of ATF. With the machine learning-based picker, phase association, location, match and locate workflow, we detecte 233 earthquakes with M_L-1–3, far more than 6 earthquakes in the routine catalog. Combining with focal mechanism solutions and the local fault structure, we find that seismic events are clustered along the ATF with strike-slip focal mechanisms and on the southern secondary faults with thrusting focal mechanisms. This overall seismic activity in the middle section of the ATF might be due to the northeastward transpressional motion of the Qinghai-Xizang Plateau block at the western margin of the Qaidam Basin.展开更多
In Arabidopsis roots,xylem-pole-pericycle(XPP)cells exhibit dual cellfates by contributing to both lateral root(LR)and cambium formation.Despite the significant progress in understanding these processes indi-vidually,...In Arabidopsis roots,xylem-pole-pericycle(XPP)cells exhibit dual cellfates by contributing to both lateral root(LR)and cambium formation.Despite the significant progress in understanding these processes indi-vidually,the mechanism deciding between these two fates and its contribution on root architecture and secondary growth remain unknown.In this study,we combined lineage tracing with molecular genetics to study the regulation of fate plasticity of Xpp cell lineage.We showed that developmentally arrested lateral root primordium(LRP)that fails to emerge as a lateral root gradually obtains cambium identity,thus contributing to secondary growth.Conversely,procambium identity within XPP cells can be reverted to LR identity when simulated by auxin,a key player in LR development.This competence for auxin-induced LR formation from XPP cells,termed LR potency,however,decreases as the root matures.We found that key cambium regulators play critical roles in shaping LR potency not only by promoting cambium identity and activation but also by inhibiting LR formation.Consistently,corresponding mutants with impaired cam-bium activity display broader LR potency.Moreover,cytokinins,essential players in cambium develop-ment,facilitate the identity transition of LRP to cambium and reduce LR potencythrough key cambium reg-ulators.Taken together,these findings highlight the inherent fate plasticity of XPP cell lineage and elucidate how planthormones influence root architecture and secondary growth through balancing the two cellfates of XPPcells.展开更多
COVID-19 is the most severe pandemic globally since the 1918 influenza pandemic.Effectively responding to this once-in-a-century global pandemic is a worldwide challenge that the international community needs to joint...COVID-19 is the most severe pandemic globally since the 1918 influenza pandemic.Effectively responding to this once-in-a-century global pandemic is a worldwide challenge that the international community needs to jointly face and solve.This study reviews and discusses the key measures taken by major countries in 2020 to fight against COVID-19,such as lockdowns,social distancing,wearing masks,hand hygiene,using Fangcang shelter hospitals,large-scale nucleic acid testing,close-contacts tracking,and pandemic information monitoring,as well as their prevention and control effects.We hope it can help improve the efficiency and effectiveness of pandemic prevention and control in future.展开更多
基金supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP, 2019QZKK0701-02)the National Natural Science Foundation of China (Grant 42104102 and 42130807)。
文摘The left-lateral Altyn Tagh Fault(ATF) system is the northern boundary of the Qinghai-Xizang Plateau, separating the Tarim Basin and the Qaidam Basin. The middle section of ATF has not recorded any large earthquakes since1598 AD, so the potential seismic hazard is unclear. We develope an earthquake catalog using continuous waveform data recorded by the Tarim-Altyn-Qaidam dense nodal seismic array from September 17 to November23, 2021 in the middle section of ATF. With the machine learning-based picker, phase association, location, match and locate workflow, we detecte 233 earthquakes with M_L-1–3, far more than 6 earthquakes in the routine catalog. Combining with focal mechanism solutions and the local fault structure, we find that seismic events are clustered along the ATF with strike-slip focal mechanisms and on the southern secondary faults with thrusting focal mechanisms. This overall seismic activity in the middle section of the ATF might be due to the northeastward transpressional motion of the Qinghai-Xizang Plateau block at the western margin of the Qaidam Basin.
基金supported by the Academy of Finland(grant numbers 316544 and 346141 to A.P.M.)European Research Council(ERC-CoG CORKtheCAMBIA,agreement 819422 to X.W.,L.Y.,J.Z.,and A.P.M.)+1 种基金the Wallenberg Academy Fellowship from the Knut and Alice Wallenberg Foundation(to C.W.M.)supported by a grant from the Chinese Scholarship Council(CSC).
文摘In Arabidopsis roots,xylem-pole-pericycle(XPP)cells exhibit dual cellfates by contributing to both lateral root(LR)and cambium formation.Despite the significant progress in understanding these processes indi-vidually,the mechanism deciding between these two fates and its contribution on root architecture and secondary growth remain unknown.In this study,we combined lineage tracing with molecular genetics to study the regulation of fate plasticity of Xpp cell lineage.We showed that developmentally arrested lateral root primordium(LRP)that fails to emerge as a lateral root gradually obtains cambium identity,thus contributing to secondary growth.Conversely,procambium identity within XPP cells can be reverted to LR identity when simulated by auxin,a key player in LR development.This competence for auxin-induced LR formation from XPP cells,termed LR potency,however,decreases as the root matures.We found that key cambium regulators play critical roles in shaping LR potency not only by promoting cambium identity and activation but also by inhibiting LR formation.Consistently,corresponding mutants with impaired cam-bium activity display broader LR potency.Moreover,cytokinins,essential players in cambium develop-ment,facilitate the identity transition of LRP to cambium and reduce LR potencythrough key cambium reg-ulators.Taken together,these findings highlight the inherent fate plasticity of XPP cell lineage and elucidate how planthormones influence root architecture and secondary growth through balancing the two cellfates of XPPcells.
基金funded by the Advisory Research Project of the Chinese Academy of Engineering(No.2020-XZ-37)the National Natural Science Foundation of China(No.81871738)the Mega-projects of Science and Technology Research(No.2018ZX10711001).
文摘COVID-19 is the most severe pandemic globally since the 1918 influenza pandemic.Effectively responding to this once-in-a-century global pandemic is a worldwide challenge that the international community needs to jointly face and solve.This study reviews and discusses the key measures taken by major countries in 2020 to fight against COVID-19,such as lockdowns,social distancing,wearing masks,hand hygiene,using Fangcang shelter hospitals,large-scale nucleic acid testing,close-contacts tracking,and pandemic information monitoring,as well as their prevention and control effects.We hope it can help improve the efficiency and effectiveness of pandemic prevention and control in future.
