检索结果-南通市图书馆

Grain Yield,Biomass Accumulation,and Leaf Photosynthetic Characteristics of Rice under Combined Salinity-Drought Stress

引用

Rice science 2024年第1期31卷 118-128,I0023页

作者： WEI Huanhe GENG Xiaoyu ZHANG Xiang ZHU Wang ZHANG Xubin chen yinglong HUO Zhongyang ZHOU Guisheng MENG Tianyao DAI Qigen Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Key Laboratory of Saline-Alkali Soil Reclamation and Utilization in Coastal Areas the Ministry of Agriculture and Rural Affairs of China/Research Institute of Rice Industrial Engineering TechnologyYangzhou UniversityYangzhou 225009China Institute of Agricultural Science and Technology Development/Joint International Research Laboratory of Agriculture and Agri-Product Safety the Ministry of Education of ChinaYangzhou UniversityYangzhou 225009China

Simultaneous stresses of salinity and drought often coincide during rice-growing seasons in saline lands,primarily due to insufficient water resources and inadequate irrigation ***,combined salinity-drought stress poses a major threat to rice *** this study,two salinity levels(NS,non-salinity;HS,high salinity)along with three drought treatments(CC,control condition;DJ,drought stress imposed at jointing;DH,drought stress imposed at heading)were performed to investigate their combined influences on leaf photosynthetic characteristics,biomass accumulation,and rice yield ***,drought,and their combination led to a shortened growth period from heading to maturity,resulting in a reduced overall growth *** yield was reduced under both salinity and drought stress,with a more substantial reduction under the combined salinity-drought *** combined stress imposed at heading caused greater yield losses in rice compared with the stress imposed at ***,the combined salinity-drought stress induced greater decreases in shoot biomass accumulation from heading to maturity,as well as in shoot biomass and nonstructural carbohydrate(NSC)content in the stem at heading and ***,it increased the harvest index and NSC remobilization *** and drought reduced the leaf area index and SPAD value of flag leaves and weakened the leaf photosynthetic characteristics as indicated by lower photosynthetic rates,transpiration rates,and stomatal *** reductions were more pronounced under the combined ***,drought,and especially their combination,decreased the activities of ascorbate peroxidase,catalase,and superoxide dismutase,while increasing the contents of malondialdehyde,hydrogen peroxide,and superoxide *** results indicated a more significant yield loss in rice when subjected to combined salinity-drought *** individual and combined stresses of salinity and dro

关键词： antioxidant defense system combined salinity-drought stress drought stress photosynthetic characteristics rice salinity stress

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Salinity Stress Deteriorates Grain Yield and Increases 2-Acetyl-1-Pyrroline Content in Rice

引用

Rice science 2024年第4期31卷 371-374,I0015-I0021页

作者： WEI Huanhe MA Weiyi ZHANG Xiang ZUO Boyuan GENG Xiaoyu WANG Lulu ZHU Wang chen yinglong HUO Zhongyang XU Ke MENG Tianyao DAI Qigen Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Key Laboratory of Saline-Alkali Soil Reclamation and Utilization in Coastal Areas the Ministry of Agriculture and Rural Affairs of China/East China Branch of National Center of Technology Innovation for Saline-Alkali Tolerant Rice/Research Institute of Rice Industrial Engineering TechnologyYangzhou UniversityYangzhou 225009China Institutes of Agricultural Science and Technology Development/Joint International Research Laboratory of Agriculture and Agri-Product Safety the Ministry of Education of ChinaYangzhou UniversityYangzhou 225009China

Salinity stress greatly impacts rice grain yield and quality, as well as the 2-acetyl-1-pyrroline(2-AP) content in grains. The present study was conducted with Nanjing 9108(NJ9108, conventional japonica rice) and Wenliangyou 669(WLY669, indica hybrid rice) in the fields with non-salinity(NS), low salinity(LS), and high salinity(HS) stresses in 2021 and 2022.

关键词： salinity Yield erior

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimizing the Bacillus thuringiensis(Bt)protein concentration in cotton:Coordinated application of exogenous amino acids and EDTA to reduce spatiotemporal variability in boll and leaf toxins

引用

Journal of Integrative Agriculture 2024年第10期23卷 3419-3436页

作者： Zhenyu Liu Shu Dong Yuting Liu Hanjia Li Fuqin Zhou Junfeng Ding Zixu Zhao yinglong chen Xiang Zhang Yuan chen Dehua chen Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of GrainCrops Yangzhou UniversityYangzhou 225009China The UWA Institute of Agriculture School of Agriculture and EnvironmentThe University of Western AustraliaPerth 6009WAAustralia

During the boll formation stage,cotton bolls exhibit the lowest expression of Bacillus thuringiensis(Bt)insecticidal *** to insects varies notably among different organs,which poses challenges for controlling cotton ***,an experimental strategy was designed in the 2020-2021 cotton growing season to coordinate the enhancement of protein synthesis and the attenuation of *** Bt cultivars of Gossypium hirsutum,namely the hybrid Sikang 3 and the conventional Sikang 1,were used as test *** treatments were applied at the peak flowering period:CK(the control),T1(amino acids),and T2(amino acids and EDTA).The results show that,in comparison to the CK group,the Bt protein contents were significantly increased in both cotton bolls and their subtending leaves under the T1 and T2 *** maximum levels of increase observed were 67.5%in cotton bolls and 21.7%in ***,the disparity in Bt protein content between cotton bolls and their subtending leaves notably decreased by 31.2%.Correlation analysis suggested that the primary physiological mechanisms for augmenting Bt protein content involve increased protein synthesis and reduced protein catabolism,which are independent of Bt gene expression *** regression and path analysis revealed that elevating the soluble protein content and transaminase activity,while reducing the catabolic enzyme activities,are instrumental in enhancing the Bt protein ***,the coordinated application of amino acids and EDTA emerges as a strategy that can improve the overall resistance of Bt cotton and mitigate the spatiotemporal variations in Bt toxin concentrations in both cotton bolls and leaves.

关键词： Gossypium hirsutum Bt cotton insecticidal protein bolls and their subtending leaves nitrogen metabolism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

“逆向混改”与民营企业创新:资源优势与治理效应视角

引用

湖南科技大学学报（社会科学版） 2024年第3期27卷 124-134页

作者：陈应龙杨茜茗湖南科技大学商学院湖南湘潭411201 湖南省战略性新兴产业研究基地湖南湘潭411201

基于2010—2021年中国沪深A股上市企业数据,实证检验了“逆向混改”对民营企业创新的影响机理。研究发现,“逆向混改”促进了民营企业创新,具体而言提升了民营企业创新投入、增加了创新产出、降低了创新风险,在进行一系列内生性及稳健... 详细信息

基于2010—2021年中国沪深A股上市企业数据,实证检验了“逆向混改”对民营企业创新的影响机理。研究发现,“逆向混改”促进了民营企业创新,具体而言提升了民营企业创新投入、增加了创新产出、降低了创新风险,在进行一系列内生性及稳健性检验后,该结论仍然成立;作用机制检验表明,“逆向混改”能产生资源优势效应降低民营企业的债务融资成本、扩大商业信用规模,同时产生治理效应缓解股东与债权人间的代理问题。“逆向混改”对民营企业创新的影响机理能为我国全面推进混合所有制改革提供新的理论支撑和实证依据。

关键词：民营企业逆向混改企业创新混合所有制改革

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

荒漠草原不同功能群优势植物的水分利用特征

引用

应用生态学报 2024年第8期35卷 2119-2130页

作者：陈晓莹陈林杨新国李敏岚余殿宋乃平陈应龙宁夏大学林业与草业学院银川70000 宁夏大学生态环境学院银川70000 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地银川750000 宁夏大学西北退化生态系统恢复与重建教育部重点实验室银川750000 中国科学院西北生态环境研究院沙漠与沙漠化重点实验室兰州70000 宁夏哈巴湖国家级自然保护区管理局宁夏吴忠751500 西澳大学农业与环境学院珀斯6009

掌握植物的水分利用特征及植物间的水源关系对实现荒漠草原地区可持续的植被恢复至关重要。本研究以荒漠草原灰钙土生境(胡杨、中间锦鸡儿和短花针茅)和风沙土生境(胡杨、北沙柳和赖草)中的5种优势植物为对象,测定植物木质部水、土壤水... 详细信息

掌握植物的水分利用特征及植物间的水源关系对实现荒漠草原地区可持续的植被恢复至关重要。本研究以荒漠草原灰钙土生境(胡杨、中间锦鸡儿和短花针茅)和风沙土生境(胡杨、北沙柳和赖草)中的5种优势植物为对象,测定植物木质部水、土壤水、地下水和降雨中稳定同位素(δ^(2)H和δ^(18)O),并结合不同深度的土壤含水量和根系数据,使用MixSIAR模型对植物的水分利用特征进行定量分析。结果表明:生长季内5种植物主要利用土壤水,且在不同生长阶段会利用不同层次的土壤水。灰钙土生境中,胡杨的水源在整个生长季变化最大,生长季初期(5-6月)主要利用60~100cm土壤水,生长旺盛期(7-8月)水源下移至100~200cm土壤水,而在生长季末期(9月)水源又上移至0~20cm土壤水;中间锦鸡儿在生长季初期主要利用60~100cm土壤水,但在生长旺盛期和末期上移至0~20cm土壤水;短花针茅在生长季初期和末期主要利用20~60cm土壤水,而在生长旺盛期上移至0~20cm土壤水。在风沙土生境中,胡杨在生长季初期主要利用60~100cm土壤水,但在生长旺盛期和末期上移至0~20cm土壤水;北沙柳在生长季初期和生长旺盛期主要利用60~100cm土壤水,但在生长季末期下移至100~200cm土壤水;赖草整个生长季都主要利用20~60cm土壤水。土壤含水量、降雨的季节变化及植物的根系分布都会影响植物的水分利用特征。在整个生长季中,灰钙土生境中的乔木、灌木和草本3种优势植物间存在水文生态位分离,促进了其对水分的分配和利用;风沙土生境中对应的3种优势植物间存在水文生态位重叠,导致其对水分的激烈竞争(特别是乔木和灌木间)。因此,在进行植被恢复时必须同时考虑物种特征和土壤特性,引入具有互补性水分利用特征的物种组合,才能实现荒漠草原地区的物种多样性和植被恢复的可持续性。

关键词：土壤生境植物吸水稳定同位素 MixSIAR 荒漠草原

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

低温工况滑阀副摩擦力工作特性研究

引用

机床与液压 2024年第17期52卷 60-67页

作者：高飞潘鹤王洋郝新娟陈英龙大连海事大学船舶与海洋工程学院辽宁大连116026 中国人民解放军93147部队贵州贵阳550025 中国航发贵州红林航空动力控制科技有限公司贵州贵阳550025

低温环境对航空液压系统提出了很多挑战,航空液压阀由多个精密机械部件组成,由于不同部件的材料及热处理工艺不同,其低温环境下的热胀冷缩性能也不同,进而导致液压阀摩擦副摩擦力显著增加,容易出现运行卡滞现象。现阶段低温下滑阀摩擦... 详细信息

低温环境对航空液压系统提出了很多挑战,航空液压阀由多个精密机械部件组成,由于不同部件的材料及热处理工艺不同,其低温环境下的热胀冷缩性能也不同,进而导致液压阀摩擦副摩擦力显著增加,容易出现运行卡滞现象。现阶段低温下滑阀摩擦性能相关研究比较少,尤其在低温环境等特定工况下,滑阀副的摩擦性能还需要更深入的研究。以低温环境下液压滑阀摩擦力为研究对象,对液压滑阀摩擦力进行了理论分析和试验研究,运用微凸体模型和牛顿内摩擦定律对滑阀中摩擦副的摩擦力进行建模分析,并搭建低温试验台分别对热冲击工况下的阀芯阀体摩擦力进行了试验研究。结果表明:所提出的摩擦力模型能够反映低温环境滑阀副摩擦力变化趋势,能够帮助分析和预测极端低温环境下滑阀副的摩擦力特征,可对低温环境下液压滑阀的设计和应用提供参考。

关键词：低温环境滑阀副摩擦力液压阀

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simulation and Experiment Research on the Proportional Pressure Control of Water-assisted Injection Molding

引用

Chinese Journal of Mechanical Engineering 2012年第3期25卷 430-438页

作者： ZHOU Hua chen yinglong ZHANG Zengmeng YANG Huayong The State Key Lab of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China

Water-assisted injection molding（WAIM）,a newly developed fluid-assisted injection molding technology has drawn more and more attentions for the energy saving,short cooling circle time and high quality of *** research for the process of WAIM has shown that the pressure control of the injecting water is mostly important for the ***,the proportional pressure control for the WAIM system is quite complex due to the existence of nonlinearities in the water hydraulic *** order to achieve better pressure control performance of the injecting water to meet the requirements of the WAIM,the proportional pressure control of the WAIM system is investigated both numerically and experimentally.A newly designed water hydraulic system for WAIM is first modeled in AMEsim environment,the load characteristics and the nonlinearities of water hydraulic system are both considered,then the main factors affecting the injecting pressure and load flow rate are extensively ***,an open-loop model-based compensation control strategy is employed to regulate the water injection pressure and a feedback proportional integrator controller is further adopted to achieve better control *** order to verify the AMEsim simulation results WAIM experiment for particular Acrylonitrile Butadiene Styrene（ABS） parts is implemented and the measured experimental data including injecting pressure and flow rate results are compared with the *** good coincidence between experiment and simulation shows that the AMEsim model is accurate,and the tracking performance of the load pressure indicates that the proposed control strategy is effective for the proportional pressure control of the nonlinear WAIM *** proposed proportional pressure control strategy and the conclusions drawn from simulation and experiment contribute to the application of water hydraulic proportional control and WAIM technology.

关键词： water-assisted injection molding nonlinear modeling proportional pressure control AMEsim simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Dragonfly Wing Structure on the Dynamic Performances

引用

Journal of Bionic Engineering 2013年第1期10卷 28-38页

作者： Huaihui Ren Xishu Wang Xudong Li yinglong chen Department of Engineering Mechanics AML Tsinghua University Beijing 100084 P. R. China Longyuan (Beijing) Wind Power Engineer Teehnology Co. Ltd Beijing 100034 P. R. China Qingdao Campus of Naval Aeronautical Academy Qingdao 266041 P. R. China

The configurations of dragonfly wings, including the corrugations of the chordwise cross-section, the microstructure of the longitudinal veins and membrane, were comprehensively investigated using the Environmental Scanning Electron Microscopy （ESEM）. Based on the experimental results reported previously, the multi-scale and multi-dimensional models with different structural features of dragonfly wing were created, and the biological dynamic behaviors of wing models were discussed through the Finite Element Method （FEM）. The results demonstrate that the effects of different structural features on dynamic behaviors of dragonfly wing such as natural frequency/modal, bending/torsional deformation, reaction force/torque are very significant. The corrugations of dragonfly wing along the chordwise can observably improve the flapping frequency because of the greater structural stiffness of wings. In updated model, the novel sandwich microstrueture of the longitudinal veins re- markably improves the torsional deformation of dragonfly wing while it has a little effect on the flapping frequency and bending deformation. These integrated structural features can adjust the deformation of wing oneself, therefore the flow field around the wings can be controlled adaptively. The fact is that the flights of dragonfly wing with sandwich microstructure of longitudinal veins are more efficient and intelligent.

关键词： self-adaptivity biomechanics dynamic behavior micromechanics multiscale

来源：

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

Arbuscular mycorrhizal fungi improved plant growth and nutrient acquisition of desert ephemeral Plantago minuta under variable soil water conditions

引用

Journal of Arid Land 2015年第3期7卷 414-420页

作者： ZhaoYong SHI Bede MICKAN Gu FENG yinglong chen College of Agriculture Henan University of Science and Technology College of Resources and Environmental Sciences China Agricultural University School of Earth and Environment the University of Western Australia State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water Resources

Desert ephemeral plants play an important role in desert *** water availability is considered as the major restrictive factor limiting the growth of ephemeral ***,arbuscular mycorrhizal fungi（AM fungi） are widely reported to improve the growth of desert *** present study aimed to test the hypothesis of that AM fungi could alleviate drought stress of desert ephemeral Plantago minuta,and AM fungal functions reduced with the improvement of soil water content.A pot experiment was carried out with three levels of soil water contents（4.5%,9.0%,and 15.8%（w/w））,and three AM inoculation treatments（Glomus mosseae,Glomus etunicatum and non-inoculation）.The results indicate that mycorrhizal colonization rate decreased with the increase of soil water *** improved plant growth and N,P and K acquisition in both shoots and roots regardless water *** comparing the two fungi,plants inoculated with *** performed better than those inoculated with *** in terms of plant growth and nutrient *** results showed that ameliorative soil water did not suppress arbuscular mycorrhizal fungal functions in improving growth and nutrient acquisition of desert ephemeral Plantago minuta.

关键词： Plantago minuta soil water availability nutrient acquisition desert ephemeral Junggar Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Role of Soft Matter in the Sandwich Vein of Dragonfly Wing in Its Configuration and Aerodynamic Behaviors

引用

Journal of Bionic Engineering 2017年第3期14卷 557-566页

作者： Xishu Wang Zhihao Zhang Huaihui Ren yinglong chen Bisheng Wu Department of Engineering Mechanics Applied Mechanics Laboratory Tsinghua University Beijing 100084 China China Longyuan Power Group Corporation Limted China Goudian Beijing 100034 China Department of Mechanical Engineering Purdue University West Lafayette 47907 USA CSIRO Energy 71 Normanby Road Clayton VIC3168 Australia

The microstructure of the main longitudinal veins of the dragonfly wing and the aerodynamic behaviors of the wing were investigated in this paper. The microstructure of longitudinal vein presents two circumferential chitin layers and a protein-fiber soft layer. The dragonfly wing is corrugated due to the spatial arrangement of longitudinal veins. It was found that the corru- gation angle could significantly influence the lift/drag ratio across a range of attack angles by the wind tunnel experiments. The results of the finite element analysis indicate that the protein soft layer of vein facilitates the change of the corrugation angle by allowing substantial relative twisting deformation between two neighboring veins, which is not possible in veins without a soft sandwich layer.

关键词： dragonfly wing longitudinal vein sandwich structure soft matter corrugation behavior

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：