检索结果-南通市图书馆

Journal of Integrative Plant Biology 2013年第7期55卷 631-642页

作者： Zhenzhen Xu Chaojun Zhang Xueyan Zhang Chuanliang Liu Zhixia Wu Zuoren Yang Kehai Zhou Xiaojie Yang Fuguang Li State Key Laboratory of Cotton Biology Institute of Cotton Research of Chinese Academy of Agriculture Sciences

To get a broader view on the molecular mechanisms underlying somatic embryogenesis （SE） in cotton （Gossypium hirsutum L.）, global analysis of cotton transcriptome dynamics during SE in different sister lines was performed using RNA-Seq. A total of 204 349 unigenes were detected by de novo assembly of the 214 977 462 Illumina reads. The quantitative reverse transcription-polymerase chain reaction （qRT-PCR） measurements were positively correlated with the RNA-Seq results for almost all the tested genes （R2 -- 0.841, correlation was significant at the 0.01 level）. Different phytohormone （auxin and cytokinin） concentration ratios in medium and the endogenous content changes of these two phytohormones at two stages in different sister lines suggested the roles of auxin and cytokinin during cotton SE. On the basis of global gene regulation of phytohormone-related genes, numerous genes from all the differentially expressed transcripts were involved in auxin and cytokinin biosynthesis and signal transduction pathways. Analyses of differentially expressed genes that were involved in these pathways revealed the substantial changes in gene type and abundance between two sister lines. Isolation, cloning and silencing/ overexpressing the genes that revealed remarkable up- or down-expression during cotton SE were important. Furthermore, auxin and cytokinin play a primary role in SE, but potential cross-talk with each other or other factors remains unclear.

关键词： Auxin cotton cytokinin RNA-Seq somatic embryogenesis.

Tree Age Affects Postharvest Attributes and Mineral Content in Amrapali Mango(Mangifera indica) Fruits

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2018年第2期4卷 55-61页

作者： MEENA Nirmal Kumar ASREY Ram Division of Food Science and Postharvest Technology ICAR-Indian Agriculture Research Institute

The study was carried out to investigate the effect of tree age on postharvest attributes and mineral content of Amrapali mango fruits. Effect of 3 different tree ages(6, 18 and 30 years) on functional components, including the antioxidant activity(AOX), total phenols, total carotenoids,ascorbic acid and minerals like Ca, K, Mg, Fe, Zn, Cu, Mn and B along with total sugars, total soluble solids(TSS) and titratable acidity(TA),respiration rate, polygalacturonase(PG) and pectin methylesterase(PME) activities in Amrapali cultivar were studied. With tree ageing total phenols, ascorbic acid and antioxidant activity decreased whereas total carotenoids increased. Ca diminished and K elevated with the tree age progression while, B, Fe, Cu, Zn, and Mn showed an indefinite pattern. Total soluble solids and total sugars were recorded higher in 18 year old tree fruits. Fruit respiration rate, polygalacturonase and pectin methylesterase activities showed an upward trend with tree ageing. The study indicates that fruit produced from middle age group mango orchard(18 year old) suits to the requirement of consumers as well as industry.

关键词： mango(Mangifera indica) tree age functional parameter mineral

Numerical simulation and experimental verification on downwash air flow of six-rotor agricultural unmanned aerial vehicle in hover

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2017年第4期10卷 41-53页

作者： Yang Fengbo Xue Xinyu Zhang Ling Sun Zhu Nanjing research institute for Agricultural Mechanization Ministry of AgricultureNanjing 210014China

Recently,multi-rotor unmanned aerial vehicle(UAV)becomes more and more significantly irreplaceable in the field of plant protection against diseases,pests and weeds of *** easy takeoff and landing performance,hover function and high spraying efficiency of UAV are urgently required to spray pesticide for crop timely and effectively,especially in dispersed plots and hilly *** such situations,the current researches about UAV spray application mainly focus on studying the influence of the UAV spraying parameters on the droplet deposition,such as operation height,operation velocity and wind *** deposition and distribution of pesticide droplets on crops which depends on installation position of nozzle and airflow distribution characteristics of UAV are directly related to the control effect of pesticide and crop growth in different growth *** a preliminary step,this study focuses on the dynamic development law and distribution characteristics of the downwash air flow for the SLK-5 six-rotor agricultural *** on compressible Reynolds-averaged Navier-Stokes(RANS)equations with an RNG k-εturbulence model and dynamic mesh technology,the efficient three-dimensional computational fluid dynamics(CFD)method was established to analyze the flow field distribution characteristics of UAV in *** the unsteady interaction flow field of the wing was investigated in *** downwash wind speed of the marked points for the SLK-5 UAV in hover was also tested by weather *** was found that the maximum velocity value of the downwash flow was close to 10 m/s;the z-direction velocity was the main body of the wind velocity in the downwash airflow,and the comparison of the wind velocity experiment test and simulation showed that the relative error was less than 12%between the experimental and simulated values of the z-direction velocity at the marked *** the flow characteristics of the longitudinal and cross section were analyzed in deta

关键词： UAV downwash air flow numerical simulation experimental verification pesticide spray wing interference

Brain endothelial cyclic GMP-AMP synthase(cGAS)-stimulator of interferon genes(STING)signaling pathway in aging and neurodegeneration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration research 2025年第7期20卷 2005-2007页

作者： Bryan Sun Lulin Li Jian Luo Palo Alto Veterans institute for research VA Palo Alto Health Care SystemPalo AltoCAUSA Polytrauma System of Care VA Palo Alto Health Care SystemPalo AltoCAUSA

The cyclic GMP-AMP synthase(cGAS)-stimulator of interferon genes(STING)signaling pathway has emerged as a key mediator of *** current studies primarily attribute its effects to neurons and glial cells,emerging research suggests that cGAS-STING signaling may play a critical role in cerebral vasculature,particularly in brain endothelial ***,studying the role 7of inflammation caused by the cGAS-STING pathway in brain endothelial cells could provide a more comprehensive understanding of neuroinflammatory disease and new avenues for therapeutic ***,we review the multifaceted role of global cGAS-STING signaling in various neurological and neuroinflammatory diseases and the potential contribution of cGAS-STING in brain endothelial cells.

关键词： stimulator interferon inflammation

Analyzing CO_(2) concentration changes and their influencing factors in Indonesia by OCO-2 and other multi-sensor remote-sensing data

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2018年第8期11卷 825-844页

作者： Shuai Yin Xiufeng Wang Heri Santoso Hiroshi Tani Guosheng Zhong Zhongyi Sun Graduate School of agriculture Hokkaido UniversitySapporoJapan research Faculty of agriculture Hokkaido UniversitySapporoJapan c Indonesian Oil Palm research institute MedanNorth SumatraIndonesia

We used OCO-2 products and considered three factors that potentially affect CO_(2) concentration in Indonesia:sea surface temperature(SST),forest fires and *** 2014 to 2016,CO_(2) concentration in Indonesia showed a trend of increase,which is consistent with the global increase reported by the Greenhouse Gases Observing Satellite(GOSAT)*** an archipelago country,the results indicate that SST has a direct effect on the CO_(2) concentration in *** changing exhibits similar fluctuations;meanwhile,CO_(2) concentration and SST also presented positive *** 2015,the number of fire hotspots suddenly increased to 140,699,because of occurrence of the worst forest *** to special geographic conditions,forest fires did not induce CO_(2) concentration changes in Indonesia,but CO_(2) concentration in the corresponding islands showed a trend of ***_(2) concentration increased in Kalimantan during the occurrence of forest fire in September–October 2014,and CO_(2) concentration increased in Kalimantan and Sumatra during the occurrence of forest fire in September–October *** indices were stable and presented no correlation with CO_(2) *** study demonstrated that OCO-2 is capable of monitoring CO_(2) concentration at a regional scale;additionally,an effective method for using OCO-2 Level 2 products is proposed.

关键词： GOSAT Kalimantan SST Sumatra X_(CO_(2))

Accumulation of heavy metals in stemwood of forest tree plantations fertilized with different sewage sludge doses

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 Forestry research 2018年第2期29卷 345-359页

作者： Marius Praspaliauskas Nerijus Pedisius Audrius Gradeckas Laboratory of Heat-Equipment research and Testing Lithuanian Energy Institute Laboratory of Forest Plant and Biotechnology Institute of Forestry Branch of Lithuanian Research Centre for Agriculture and Forestry

The levels of heavy metals that accumulated in stemwood of mature trees grown for 20 years in a plantation in an abandoned peat quarry in areas that were fertilized with different amounts of domestic sewage sludge(180,360,and720 Mg ha-1on a dry basis) were compared with trees grown in a reference nonfertilized *** in the study was a hybrid poplar(Populus tremula x Populus tremuloides) developed for use as an energy crop,three local tree species and one introduced tree *** concentrations of Cd,Cr,Cu,Ni,Pb and Zn in the stemwood of the trees grown in the fertilized and nonfertilized fields were determined,and found to be significantly lower than their respective concentrations in the *** and Cr were found only in several wood samples at concentrations close to the limits of detection or qualification; therefore,they were not analyzed further.A correlation analysis suggested that 75%of the correlations between the concentrations of heavy metals in the stemwood and the concentrations in the soil were *** ability of trees to accumulate the metals from soil in most cases decreased for Cu and Ni; however,the correlations were not as clear for Pb and *** followingsequence for the levels of heavy metals found in the stemwood of the analysed trees was Zn [ Pb [ Ni [ Cu [(Cr,Cd).The results of this study showed that the levels of heavy metals in the studied wood would not exceed the permitted limits of heavy metal pollution in the air and ash when used for energy production.

关键词： Forest tree plantation Accumulation factor Saturation limit Biosolids Heavy metals Long-term field experiments Biofuels

Soil organic carbon pool along different altitudinal level in the Sygera Mountains, Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2016年第3期13卷 476-483页

作者： MA He-ping YANG Xiao-lin GUO Qi-qiang ZHANG Xin-jun ZHOU Chen-ni research institute of Plateau Ecology Tibet Agriculture and Animal Husbandry College Faculty of Forest Resources and Environmental Science Tibet Agriculture and Animal Husbandry College

Labile organic carbon（LOC） is one of the most important indicators of soil organic matter quality and dynamics elevation and plays important function in the Tibetan Plateau climate. However, it is unknown what the sources and causes of LOC contamination are. In this study, soil organic carbon（SOC）, total nitrogen（TN）, microbial biomass carbon（MBC）, microbial biomass nitrogen（MBN） and LOC were analyzed based on different soil horizons and elevations using turnover time in an experimental site（3700 m to 4300 m area） in Sygera. SOC and LOC in higher-elevation vegetation types were higher than that of in lower-elevation vegetation types. Our results presented that the soil microbial biomass carbon（SMBC） and soil microbial biomass nitrogen（SMBN）were positively correlated with SOC. The content of easily oxidized carbon（EOC）, particulate organic carbon（POC） and light fraction organic carbon（LFOC） decreased with depth increasing and the content were the lowest in the 60 cm to 100 cm *** total SOC, ROC and POC contents decreased with increasing soil horizons. The SOC, TN, MBC and MBN contents increased with increasing altitude in the Sygera Mountains. The MBC and MBN contents weredifferent with the changes of SOC（p＆lt;0.05）,meanwhile, both LFOC and POC were related to total SOC（p＆lt;0.05）. The physical and chemical properties of soil, including temperature, humidity, and altitude,were involved in the regulation of SOC, TN, MBC,MBN and LFOC contents in the Sygera Mountains,Tibetan Plateau.

关键词： Labile soil organic Easily oxidized carbon KMn O_4 Light fraction organic carbon Particulate organic carbon

RNA Methylome Reveals the m^(6)A-mediated Regulation of Flavor Metabolites in Tea Leaves under Solar-withering

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2023年第4期21卷 769-787页

作者： Chen Zhu Shuting Zhang Chengzhe Zhou Caiyun Tian Biying Shi Kai Xu Linjie Huang Yun Sun Yuling Lin Zhongxiong Lai Yuqiong Guo College of Horticulture Fujian Agriculture and Forestry UniversityFuzhou 350002China institute of Horticultural Biotechnology Fujian Agriculture and Forestry UniversityFuzhou 350002China Tea Industry research institute Fujian Agriculture and Forestry UniversityFuzhou 350002China

The epitranscriptomic mark N6-methyladenosine(m^(6)A),which is the predominant internal modification in RNA,is important for plant responses to diverse *** environmental stresses caused by the tea-withering process can greatly influence the accumulation of specialized metabolites and the formation of tea ***,the effects of the m^(6)A-mediated regulatory mechanism on flavor-related metabolic pathways in tea leaves remain relatively *** performed an integrated RNA methylome and transcriptome analysis to explore the m^(6)Amediated regulatory mechanism and its effects on flavonoid and terpenoid metabolism in tea(Camellia sinensis)leaves under solar-withering *** changes in global m^(6)A level in tea leaves were mainly controlled by two m^(6)A erasers(CsALKBH4A and CsALKBH4B)during solar-withering *** methylated peak-associated genes following solarwithering treatments with different shading rates were assigned to terpenoid biosynthesis and spliceosome *** analyses indicated that CsALKBH4-driven RNA demethylation can directly affect the accumulation of volatile terpenoids by mediating the stability and abundance of terpenoid biosynthesis-related transcripts and also indirectly influence the flavonoid,catechin,and theaflavin contents by triggering alternative splicing-mediated *** findings revealed a novel layer of epitranscriptomic gene regulation in tea flavor-related metabolic pathways and established a link between the m^(6)A-mediated regulatory mechanism and the formation of tea flavor under solar-withering conditions.

关键词： Camellia sinensis RNA methylation Epitranscriptome Secondary metabolite Withering

^14CO2 Fixation and Translocation of Photoassimilates as Selection Criteria of Egyptian Taro Genotypes

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 Integrative Plant Biology 2006年第5期48卷 563-566页

作者： Helal Ragab Moussa Afaf Abd EI-Kader Salem Radioisotopes Department Atomic Energy Authority Cairo Egypt Horticultural research institute Agriculture Research Center Giza Egypt

The growth characterlstlcs, different physlological parameters, photosynthetic activity （^14CO2 fixation）, and the translocatlon rate of photoassimllates In different taro （Colocasia esculenta L. Schott） genotypes was studled In order to determlne the posslble use of these parameters as selectlon crlterla for dlfferent wldely used genotypes of taro （Delta No. 9, 15, 20, 21, and balady）. The results obtalned suggest that Delta No. 21 shows the most slgnlflcant increase In all parameters tested compared wlth the control （balady）, followed by Delta No. 9, 15, and 20, respectively. The results show a positive correlation between photosynthetlc actlvlty, translocatlon efflclency, and total yield. The selected clone Delta No. 21 Is recommended for cultlvatlon In the delta reglon of Egypt.

关键词： ^14CO2 fixation taro (Colocasia esculenta) translocation rate.

Influence of bean rhizosphere on the biological properties and phosphorus fractionation in the calcareous soils amended with municipal sewage sludge

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 Arid Land 2015年第5期7卷 644-652页

作者： Tahereh RAIESI Alireza HOSSEINPUR Hamideh RAIESI Horticultural Science research institute Citrus and Subtropical Fruit Research Center Agricultural Research and Education Organization (AREO) Department of Soil Science College of Agriculture Shahrekord University Department of Plant Protection College of Agriculture Guilan University

The biological and chemical conditions of the rhizosphere are known to considerably differ from those of the bulk soil, as a consequence of a range of processes that are induced either directly by the activity of plant roots or indirectly by the stimulation of microbial population and activity in the rhizosphere. Information about phosphorus （P） fractionation in the rhizosphere soils amended with municipal sewage sludge （MSS） is limited, were We carried out greenhouse experiments using a rhizobox in order to evaluate the effects of bean rhizosphere on the various inorganic P （Pi） fractions, organic P （Po）, P in particulate fraction （PF-P）, Olsen-P, dissolved organic C （DOC）, microbial biomass P （MBP） and alkaline phosphatase （ALP） enzyme in 10 calcareous soils amended with MSS （10 g MSS was added to 1 kg soil）. Non-occluded P, occluded P, calcium phosphate and residual P were also quantitated. The results showed that DOC, MBP and ALP activity strongly increased and PF-P and Olsen-P de- creased in the rhizosphere soils compared with in the bulk soils （P〈0.05）. The contents of non-occluded P, oc- cluded P and residuaI-P fractions in the rhizosphere soils were lower than in the bulk soils, while the contents of calcium phosphate and organic P in the rhizosphere soils were higher than in the bulk soils. Simple correlation coefficients showed that P uptake had positive relationship with non-occluded P, occluded P, calcium phosphate fractions and PF-P in the rhizosphere soils. The results suggest that the short-term application of MSS to the cal- careous soils may increase Po and calcium phosphate fractions in the rhizosphere soils, and calcium phosphate fraction is potentially available to crops.

关键词： biological properties mineral phosphorus organic phosphorus semi-arid land