检索结果-南通市图书馆

Rhizosphere Aeration Improves Nitrogen Transformation in Soil, and Nitrogen Absorption and Accumulation in Rice Plants

在线全文

学校读者我要写书评

暂无评论

Rice science 2020年第2期27卷 162-174页

作者： xu chunmei CHEN Liping CHEN Song CHU Guang WANG Danying ZHANG Xiufu China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006China

Two rice cultivars(Xiushui 09 and Chunyou 84)were used to evaluate the effects of various soil oxygen(O2)conditions on soil nitrogen(N)transformation,absorption and accumulation in rice *** treatments were continuous flooding(CF),continuous flooding and aeration(CFA),and alternate wetting and drying(AWD).The results showed that the AWD and CFA treatments improved soil N transformation,rice growth,and N absorption and *** NO3–content,nitrification activity and ammonia-oxidising bacteria abundance,leaf area,nitrate reductase activity,and N absorption and accumulation in rice all increased in both ***,soil microbial biomass carbon and pH did not significantly change during the whole period of rice *** analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance,and both of them significantly increased as the total N accumulation in rice *** results indicated that improved soil O2 conditions led to changing soil N cycling and contributed to increases in N absorption and accumulation by rice in paddy fields.

关键词： ammonium-nitrogen content nitrate-nitrogen content nitrification activity nitrate reductase activity rhizosphere oxygen condition ammonia-oxidising bacteria abundance rice nitrogen use efficiency

Agronomic performance of drought-resistance rice cultivars grown under alternate wetting and drying irrigation management in southeast China

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2018年第5期6卷 482-494页

作者： Guang Chu Tingting Chen Song Chen chunmei xu Danying Wang Xiufu Zhang China National Rice Research Institute Chinese Academy of Agricultural Sciences

Compared to drought-susceptible rice cultivars(DSRs),drought-resistance rice cultivars(DRRs)could drastically reduce the amount of irrigation water input and simultaneously result in higher grain yield under water-saving irrigation ***,the mechanisms underlying these properties are *** investigated how improved agronomic traits contribute to higher yield and higher water use efficiency(WUE)in DRRs than in DSRs under alternate wetting and drying(AWD).Two DRRs and two DSRs were field-grown in 2015 and 2016 using two different irrigation regimes:continuous flooding(CF)and *** CF,no statistical differences in grain yield and WUE were observed between DRRs and *** water under the AWD regime was 275–349 mm,an amount 49.8%–56.2% of that(552–620 mm)applied under the CF *** to CF,AWD significantly decreased grain yield in both DRRs and DSRs,with a more significant reduction in DSRs,and WUE was increased in DRRs,but not in DSRs,by 9.9%–23.0% under *** AWD,DRRs showed a 20.2%–26.2% increase in grain yield and an 18.6%–24.5% increase in WUE compared to *** to DSRs,DRRs showed less redundant vegetative growth,greater sink capacity,higher grain filling efficiency,larger root biomass,and deeper root distribution under *** conclude that these improved agronomic traits exert positive influences on WUE in DRRs under AWD.

关键词： Agronomic traits Alternate wetting and drying Drought-resistance rice cultivars Grain yield Water use efficiency

Cortisol safeguards oogenesis by promoting follicular cell survival

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第8期65卷 1563-1577页

作者： Hesheng Xiao Zhen xu Xi Zhu Jingrong Wang Qiaoyuan Zheng Qingqing Zhang chunmei xu Wenjing Tao Deshou Wang Key Laboratory of Freshwater Fish Reproduction and Development(Ministry of Education) Key Laboratory of Aquatic Science of ChongqingSchool of Life SciencesSouthwest UniversityChongqing400715China

The role of glucocorticoids in oogenesis remains to be elucidated. cyp11c1 encodes the key enzyme involved in the synthesis of cortisol, the major glucocorticoid in teleosts. In our previous study, we mutated cyp11c1 in tilapia and analyzed its role in spermatogenesis. In this study, we analyzed its role in oogenesis. cyp11c1^(+/-)XX tilapia showed normal ovarian morphology but poor egg quality, as indicated by the mortality of embryos before 3 d post fertilization, which could be partially rescued by the supplement of exogenous cortisol to the mother fish. Transcriptome analyses revealed reduced expression of maternal genes in the eggs of the cyp11c1^(+/-)XX fish. The cyp11c1^(-/-)females showed impaired vitellogenesis and arrested oogenesis due to significantly decreased serum cortisol. Further analyses revealed decreased serum E2 level and expression of amh, an important regulator of follicular cell development, and increased follicular cell apoptosis in the ovaries of cyp11c1^(-/-)XX fish, which could be rescued by supplement of either exogenous cortisol or E2. Luciferase assays revealed a direct regulation of cortisol and E2 on amh transcription via GRs or ESRs. Taken together, our results demonstrate that cortisol safeguards oogenesis by promoting follicular cell survival probably via Amh signaling.

关键词： oogenesis cortisol cyp11c1 Nile tilapia CRISPR/Cas9

Transient induction of actin cytoskeletal remodeling associated with dedifferentiation,proliferation,and redifferentiation stimulates cardiac regeneration

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第6期14卷 2537-2553页

作者： Wenbin Fu Qiao Liao Yu Shi Wujian Liu Hongmei Ren chunmei xu Chunyu Zeng Department of Cardiology Daping Hospitalthe Third Military Medical University(Army Medical University)Chongqing 400042China Key Laboratory of Geriatric Cardiovascular and Cerebrovascular Disease Research Ministry of Education of ChinaChongqing 400042China Chongqing Key Laboratory for Hypertension Research Chongqing Cardiovascular Clinical Research CenterChongqing Institute of CardiologyChongqing 400042China State Key Laboratory of Trauma Burns and Combined InjuryDaping Hospitalthe Third Military Medical UniversityChongqing 400042China Cardiovascular Research Center Chongqing CollegeUniversity of Chinese Academy of SciencesChongqing 400042China State Key Laboratory of Trauma and Chemical Poisoning Chongqing 400042China

The formation of new and functional cardiomyocytes requires a 3-step process:dedifferentiation,proliferation,and redifferentiation,but the critical genes required for efficient dedifferentiation,proliferation,and redifferentiation remain *** our study,a circular trajectory using single-nucleus RNA sequencing of the pericentriolar material 1 positive(PCM1^(+))cardiomyocyte nuclei from hearts 1 and 3 days after surgery-induced myocardial infarction(MI)on postnatal Day 1 was reconstructed and demonstrated that actin remodeling contributed to the dedifferentiation,proliferation,and redifferentiation of cardiomyocytes after *** identified four top actin-remodeling regulators,namely Tmsb4x,Tmsb10,Dmd,and Ctnna3,which we collectively referred to as *** expressed changes of 2D2P,using a polycistronic non-integrating lentivirus driven by Tnnt2(cardiac-specific troponin T)promoters(Tnnt2-2D2P-NIL),efficiently induced transiently proliferative activation and actin remodeling in postnatal Day 7 cardiomyocytes and adult ***,the intramyocardial delivery of Tnnt2-2D2P-NIL resulted in a sustained improvement in cardiac function without ventricular dilatation,thickened septum,or fatal arrhythmia for at least 4 *** conclusion,this study highlights the importance of actin remodeling in cardiac regeneration and provides a foundation for new gene-cocktail-therapy approaches to improve cardiac repair and treat heart failure using a novel transient and cardiomyocyte-specific viral construct.

关键词： Single cell analysis Actin remodeling Tmsb4x Tmsb10 Dmd Ctnna3 Myocardial infarction Cardiomyocytes proliferation Cardiac regeneration Genetic therapy

An Overview of Intelligent Wireless Communications Using Deep Reinforcement Learning

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Communications and Information Networks 2019年第2期4卷 15-29页

作者： Yongming Huang chunmei xu Cheng Zhang Meng Hua Zhengming Zhang School of Information Science and Engineering Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China

Future wireless communication networks tend to be intelligentized to accomplish the missions that cannot be *** the new intelligent communication systems,optimizing the network perfor-mance has become a challenge due to the ever-increasing complexity of the network *** theories and technologies for intelligent wireless communications have obtained widespread attention,among which deep reinforcement learning(DRL)is an excellent machine learning *** has great potential in enhancing the intelligence of wireless communication systems while overcoming the above *** paper presents a review on applications of DRL in intelligent wireless com-munications with focuses on millimeter wave(mmWave),intelligent caching and unmanned aerial vehicle(UAV)*** first introduce the concepts and basic prin-ciples of single/multi-agent DRL ***,we review the related works where DRL algorithms are used to address emerging issues in wireless *** issues include mmWave communication,intelligent caching,UAV aided communication,and handover/access control in ***,critical challenges and future research directions of applying DRL in intelligent wireless communications are outlined.

关键词： deep reinforcement learning multi-agent reinforcement learning intelligent wireless communications mmWave caching UAV

Soil Nitrogen Distribution and Plant Nitrogen Utilization in Direct-Seeded Rice in Response to Deep Placement of Basal Fertilizer-Nitrogen

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rice science 2019年第6期26卷 404-415页

作者： WANG Danying YE Chang xu chunmei WANG Zaiman CHEN Song CHU Guang ZHANG Xiufu State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of Education / South China Agricultural University Guangzhou 510642 China

Deep placement of controlled-release fertilizer increases nitrogen (N) use efficiency in rice planting but is expensive. Few studies on direct-seeded rice have examined the effects of deep placement of conventional fertilizer. With prilled urea serving as N fertilizer, a two-year field experiment with two N rates (120 and 195 kg/hm2) and four basal N application treatments (B50, all fertilizer was broadcast with 50% as basal N;D50, D70 and D100 corresponded to 50%, 70% and 100% of N deeply placed as basal N, respectively) were conducted in direct-seeded rice in 2013 and 2014. Soil N distribution and plant N uptake were analyzed. The results showed that deep placement of basal N significantly increased total N concentrations in soil. Significantly greater soil N concentrations were observed in D100 compared with B50 at 0, 6 and 12 cm (lateral distance) from the fertilizer application point both at mid-tillering and heading stages. D100 presented the highest values of dry matter and N accumulation from seeding to mid-tillering stages, but it presented the lowest values from heading to maturity stages and the lowest grain yield for no sufficient N supply at the reproductive stage. The grain yield of D50 was the highest, however, no significant difference was observed in grain yield, N agronomic efficiency or N recovery efficiency between D70 and D50, or between D70 and B50, while D70 was more labor saving than D50 for only one topdressing was applied in D70 compared with twice in other treatments. The above results indicated that 70% of fertilizer-N deeply placed as a basal fertilizer and 30% of fertilizer-N topdressed as a panicle fertilizer constituted an ideal approach for direct-seeded rice. This recommendation was further verified through on-farm demonstration experiments in 2015, in which D70 produced in similar grain yields as B50 did.

关键词： direct-seeded rice nitrogen fertilizer deep placement soil nitrogen distribution nitrogen utilization

Rock Mass Characteristics in Beishan,A Preselected Area for China's High-Level Radioactive Waste Disposal

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第2期93卷 362-372页

作者： WEI Xiang GUO Ying CHENG Hanlie MENG Xiangdong CHENG Mingqian YANG Ting xu chunmei Chongqing Technology and Business University Institute of Geology and Paleontology Linyi University LandOcean Energy Services Co. Ltd. Chongqing University of Technology

Geological and hydrological characteristics, joint geometric features, rock physical and mechanical properties and rock mass quality are studied in the Beishan area, preselected for China5 s high-level radioactive waste(HLW) disposal engineering. A comprehensive survey method is developed to study joint geometric features in the outcrop and samples from borehole BS06 into the Xinchang rock mass were tested. The optimal joint sets are determined by rose diagrams and equal-area lower hemisphere plots of joint poles. Results show that: 1) the distribution of joint occurrence obeys a normal distribution, while the distribution of joint spacing obeys a negative exponential distribution; 2) concentric circular and tangent circular sampling windows are applied to study the trace length and the trace midpoint density. Results indicate that tangent circular sampling window is more stable and reasonable; 3) Beishan granite shows high density, low porosity and high strength based on many laboratory tests and the physical properties and mechanical properties are closely related; and4) a synthesis index, Joint Structure Rating(JSR), is applied to evaluate the quality of rock mass. Through the research results of rock mass characteristics, the Xinchang rock mass in the Beishan preselected area has the favorable conditions for China's HLW disposal repository site.

关键词： geology hydrology radioactive waste disposal(HLW) rock mass quality joint geometric features physical/mechanical properties

Solar radiation-use characteristics of indica/japonica hybrid rice (Oryza sativa L.) in the late season in southeast China

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2021年第2期9卷 427-439页

作者： Min Yin Shaowen Liu Xi Zheng Guang Chu chunmei xu Xiufu Zhang Dangying Wang Song Chen China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006ZhejiangChina The Faculty of Agriculture Life and Environmental SciencesZhejiang UniversityHangzhou 310029ZhejiangChina

New indica and japonica hybrid rice cultivars,such as the Yongyou series,provide farmers with very high yield ***,information on their canopy light capture and solar radiation use efficiency in the late season is *** experiments were performed to compare the radiation-use parameters of four rice types:indica rice(IR),inbred japonica rice(IJR),hybrid japonica rice(HJR),and hybrid indica/japonica rice(HIJR),from 2016 to 2018 during the late season in Hangzhou,*** grain yield,aboveground biomass,intercepted solar radiation(SI),and radiation-use efficiency(RUE)of the HIJR were on average respectively 13.4%–53.4%,14.3%–30.6%,7.6%–21.4%,and 8.2%–14.9%higher than those of the HJR,IJR,and *** leaf area index(LAI)of the HIJR was 18.2%–57.0%greater than that of the IJR and HJR at four growth stages,resulting in respectively 17.8%–38.5%and 10.7%–42.8%greater canopy light interception rates(LIR)and amount of intercepted solar radiation during the vegetative *** prolonged grain-filling stage also led to respectively 33.9%–52.6%and 30.5%–51.4%increases in amounts of incident and intercepted radiation for the HIJR relative to the IR during grain *** results indicate that the SI superiority of the HIJR was caused by canopy closure as rapid as that of the IR during the vegetative stage(greater LAI and canopy LIR during the growing season)and a grain-filling stage as long as that of the *** grain-filling stage,differences in leaf Pn between HIJR,IR,and IJR were not significant,suggesting that the greater RUE of the HIJR(12.7%–52.8%higher)than that of the other rice types resulted from improved canopy architecture after flowering(FL).Principal components analysis(PCA)revealed that the superiority of the HIJR in terms of solar radiation use resulted from the greater canopy light capture capability of IR and the prolonged growth period(especially during grain filling)of japonica rice in the late growing season.

关键词： indica/japonica hybrid rice Solar radiation use Canopy light capture Leaf area index

Effects of increasing panicle-stage N on yield and N use efficiency of indica rice and its relationship with soil fertility

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2022年第6期10卷 1784-1797页

作者： Chang Ye Hengyu Ma Xiu Huang chunmei xu Song Chen Guang Chu Xiufu Zhang Danying Wang The State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006ZhejiangChina

Because of the higher nitrogen(N)recovery efficiency(NRE)of panicle-stage fertilization compared with basal and tillering fertilization,increasing the proportion of N topdressing at the booting stage(panicleN)is recommended and commonly practiced in parts of *** investigate the effects of increasing panicle-N on grain yield and N use efficiency(NUE)and the relationships of the increase and the rice cultivar and soil fertility status,we increased the percentage of panicle-N from 20%to 40%by correspondingly reducing the N amount applied only at the tillering stage in both high-and low-fertility blue clayey paddy fields in 2018 and *** indica cultivars with diverse panicle types were used,and their grain yield,dry matter accumulation,and NUE were *** high-fertility soil,increasing topdressing panicle-N from 20%to 40%reduced tillering ability and reduced the effective panicle numbers of the multi-and medium-panicle cultivars Huanghuazhan(HHZ),C Liangyouhuazhan(CHZ),and Tianyouhuazhan(THZ).These cultivars gave the greatest yield when 30%of N was supplied as panicle fertilizer,whereas the yield,NRE,N agronomic efficiency(NAE),and nitrogen physiological efficiency(NPE)of the heavy-panicle inbred cultivar Yangdao 6(YD6)continued to increase,resulting in improved dry matter accumulation and grain filling in the late growth *** yield,NAE,NRE,and NPE of YD6 peaked when the panicle-N constituted 40%.While in low-fertility soil,the multipanicle cultivar HHZ showed the greatest yield when 30%of fertilizer-N was applied once at the panicle initiation(PI)stage,while the medium-panicle cultivar CHZ showed the greatest yield when the panicle-N percentage was 40%.Our results suggest that the percentage of panicle-N fertilizer should not exceed 30%for multipanicle cultivars,while can be appropriately increased to 40%for heavy-panicle indica *** effect of increasing topdressing panicle-N on the yield of medium-panicle cultivars was related to soil fert

关键词： Indica rice Panicle-N Yield Nitrogen use efficiency Soil fertility