High salt is a major environmental factor that threatens plant growth and development.Increasing evidence indicates that histone acetylation is involved in plant responses to various abiotic stress;however,the underly...High salt is a major environmental factor that threatens plant growth and development.Increasing evidence indicates that histone acetylation is involved in plant responses to various abiotic stress;however,the underlying epigenetic regulatory mechanisms remain poorly understood.In this study,we revealed that the histone deacetylase OsHDA706 epigenetically regulates the expression of salt stress response genes in rice(Oryza sativa L.).OsHDA706 localizes to the nucleus and cytoplasm and OsHDA706 expression is significantly induced under salt stress.Moreover,oshda706 mutants showed a higher sensitivity to salt stress than the wild-type.In vivo and in vitro enzymatic activity assays demonstrated that OsHDA706 specifically regulates the deacetylation of lysines 5 and 8 on histone H4(H4K5and H4K8).By combining chromatin immunoprecipitation and mRNA sequencing,we identified the clade A protein phosphatase 2C gene,OsPP2C49,which is involved in the salt response as a direct target of H4K5 and H4K8 acetylation.We found that the expression of OsPP2C49 is induced in the oshda706 mutant under salt stress.Furthermore,the knockout of OsPP2C49 enhances plant tolerance to salt stress,while its overexpression has the opposite effect.Taken together,our results indicate that OsHDA706,a histone H4 deacetylase,participates in the salt stress response by regulating the expression of OsPP2C49 via H4K5 and H4K8 deacetylation.展开更多
The CO_(2)photoconversion is sensitive to the local reaction environment,of which activity and selectivity can be regulated by the change of reaction systems.This paper focuses on investigating the photocatalytic CO_(...The CO_(2)photoconversion is sensitive to the local reaction environment,of which activity and selectivity can be regulated by the change of reaction systems.This paper focuses on investigating the photocatalytic CO_(2)reduction behaviors of MOFs with the involvement of water under different reaction modes,including gas-solid and liquid-solid systems.The CO_(2)photoreduction in a liquid-solid system shows high performance in generating HCOOH with the selectivity of 100%.In contrast,the gas-solid system referring to the synergistic interaction of MOFs and H_(2)O vapor benefits to the formation of gas-phase products,such as CO and CH_(4).The possible mechanisms of photocatalytic CO_(2)reaction in two modes were investigated by in-situ Fourier-transform infrared spectroscopy,which indicates that the distinction in reaction consequence may result from the difference in CO_(2)chemisorbed modes and the proton provision.The choice of reaction system plays an important role in the achievement of high efficiency and selectivity for photocatalytic CO,reduction,whichis of great practical value in real-world applications.展开更多
基金supported by grants from the National Natural Science Foundation of China(31871232)the Jiangsu Province Government(JBGS[2021]001)+3 种基金the Natural Science Foundation of Jiangsu Province(BK20200947)the State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources(SKLCUSA-b202003)the Project of Zhongshan Biological Breeding Laboratory(BM2022008-02)the Fund of Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘High salt is a major environmental factor that threatens plant growth and development.Increasing evidence indicates that histone acetylation is involved in plant responses to various abiotic stress;however,the underlying epigenetic regulatory mechanisms remain poorly understood.In this study,we revealed that the histone deacetylase OsHDA706 epigenetically regulates the expression of salt stress response genes in rice(Oryza sativa L.).OsHDA706 localizes to the nucleus and cytoplasm and OsHDA706 expression is significantly induced under salt stress.Moreover,oshda706 mutants showed a higher sensitivity to salt stress than the wild-type.In vivo and in vitro enzymatic activity assays demonstrated that OsHDA706 specifically regulates the deacetylation of lysines 5 and 8 on histone H4(H4K5and H4K8).By combining chromatin immunoprecipitation and mRNA sequencing,we identified the clade A protein phosphatase 2C gene,OsPP2C49,which is involved in the salt response as a direct target of H4K5 and H4K8 acetylation.We found that the expression of OsPP2C49 is induced in the oshda706 mutant under salt stress.Furthermore,the knockout of OsPP2C49 enhances plant tolerance to salt stress,while its overexpression has the opposite effect.Taken together,our results indicate that OsHDA706,a histone H4 deacetylase,participates in the salt stress response by regulating the expression of OsPP2C49 via H4K5 and H4K8 deacetylation.
基金the Fujian Science Technology Innovation Laboratory for Optoelectronic Information of China(Nos.2021ZR105,2021ZZ103)the National Natural Science Foundation of China(Nos.22071246,22033008).
文摘The CO_(2)photoconversion is sensitive to the local reaction environment,of which activity and selectivity can be regulated by the change of reaction systems.This paper focuses on investigating the photocatalytic CO_(2)reduction behaviors of MOFs with the involvement of water under different reaction modes,including gas-solid and liquid-solid systems.The CO_(2)photoreduction in a liquid-solid system shows high performance in generating HCOOH with the selectivity of 100%.In contrast,the gas-solid system referring to the synergistic interaction of MOFs and H_(2)O vapor benefits to the formation of gas-phase products,such as CO and CH_(4).The possible mechanisms of photocatalytic CO_(2)reaction in two modes were investigated by in-situ Fourier-transform infrared spectroscopy,which indicates that the distinction in reaction consequence may result from the difference in CO_(2)chemisorbed modes and the proton provision.The choice of reaction system plays an important role in the achievement of high efficiency and selectivity for photocatalytic CO,reduction,whichis of great practical value in real-world applications.
