检索结果-南通市图书馆

comparative histology,transcriptome,and metabolite profi ling unravel the browning mechanisms of calli derived from ginkgo(Ginkgo biloba L.)

引用

Journal of forestry Research 2023年第3期34卷 677-691页

作者： Xiaoming Yang Qi Xu Linlin Le Tingting Zhou Wanwen Yu Guibin Wang Fang-Fang Fu Fuliang Cao Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China

Gingko biloba accumulates high levels of secondary metabolites of pharmaceutical value.Ginkgo calli develop a typical browning that reduces its regenerative capacity and thus its usefulness.To elucidate the browning mechanism,histological,transcriptomic,and metabolic alterations were compared between green and browning calli derived from immature ginkgo embryos.Histological observations revealed that browning calli had a more loosely arranged cell structure and accumulated more tannins than in green calli.Integrated metabolic and transcriptomic analyses showed that phenylpropanoid metabolism was specifi-cally activated in the browning calli,and 428 diff erentially expressed genes and 63 diff erentially abundant metabolites,including 12 fl avonoid compounds,were identifi ed in the browning calli compared to the green calli.Moreover,the expression of fl avonol synthase(FLS)and UDP-glucuronosyl-transferase(UGT)genes involved in the fl avonoid pathway was more than tenfold higher in browning calli than in green calli,thus promoting biosynthesis of fl avonol,which serves as a substrate to form glycosylated fl avonoids.Flavonoid glycosides constituted the major coloring component of the browning calli and may act in response to multiple stress conditions to delay cell death caused by browning.Our results revealed the cellular and biochemical changes in browning callus cells that accompanied changes in expression of browning-related genes,providing a scientifi c basis for improving ginkgo tissue culturability.

关键词： Ginkgo Callus browning Histology Transcriptome Metabolite Flavonoid biosynthesis

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

Reconstructing historical forest fire risk in the non-satellite era using the improved forest fire danger index and long short-term memory deep learning-a case study in Sichuan Province,southwestern china

引用

Forest Ecosystems 2024年第1期11卷 87-99页

作者： Yuwen Peng Huiyi Su Min Sun Mingshi Li Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037China college of forestry Nanjing Forestry UniversityNanjing 210037China

Historical forest fire risk databases are vital for evaluating the effectiveness of past forest management approaches,enhancing forest fire warnings and emergency response capabilities,and accurately budgeting potential carbon emissions resulting from fires.However,due to the unavailability of spatial information technology,such databases are extremely difficult to build reliably and completely in the non-satellite era.This study presented an improved forest fire risk reconstruction framework that integrates a deep learning-based time series prediction model and spatial interpolation to address the challenge in Sichuan Province,southwestern china.First,the forest fire danger index(FFDI)was improved by supplementing slope and aspect information.We compared the performances of three time series models,namely,the autoregressive integrated moving average(ARIMA),Prophet and long short-term memory(LSTM)in predicting the modified forest fire danger index(MFFDI).The bestperforming model was used to retrace the MFFDI of individual stations from 1941 to 1970.Following this,the Anusplin spatial interpolation method was used to map the distributions of the MFFDI at five-year intervals,which were then subjected to weighted overlay with the distance-to-river layer to generate forest fire risk maps for reconstructing the forest fire danger database.The results revealed LSTM as the most accurate in fitting and predicting the historical MFFDI,with a fitting determination coefficient(R^2)of 0.709,mean square error(MSE)of0.047,and validation R^2 and MSE of 0.508 and 0.11,respectively.Independent validation of the predicted forest fire risk maps indicated that 5 out of 7 historical forest fire events were located in forest fire-prone areas,which is higher than the results determined from the original FFDI(2 out of 7).This proves the effectiveness of the improved MFFDI and indicates a high level of reliability of the historical forest fire risk reconstruction method proposed in this study.

关键词： Forest fire risk reconstruction MFFDI Time series models LSTM ARIMA Prophet Anusplin

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

Analysis and characterization of the Salix suchowensis chloroplast genome

引用

Journal of forestry Research 2018年第4期29卷 997-1005页

作者： congrui Sun Jie Li Xiaogang Dai Yingnan Chen Co-Innovation Center for Sustainable Forestry in Southern China College of ForestryNanjing Forestry University

By screening sequence reads from the Salix suchowensis chloroplast （cp） genome that were generated by next-generation sequencing platforms, we assembled a complete circular pseudomolecule for the cp genome. This pseudomolecule is 155,508 bp long and has a typical quadripartite structure that contains two single copy regions, a large single copy region （LSC, 84,385 bp）, and a small single copy region （SSC, 16,209 bp） separated by inverted repeat regions （IRs, 27,457 bp）. Gene annotation revealed that the S. suchowensis cp genome encoded 119 unique genes, including four ribosome RNA genes, 30 transfer RNA genes, 82 protein-coding genes, and three pseudogenes. Analysis of the repetitive sequences revealed 31 tandem repeats, 16 forward repeats, and five palindromic repeats. In addition, a total of 148 perfect microsatellites, which were characterized as A/T dominant in nucleotide composition, were detected. Significant shifting of the IR/SSC boundaries was revealed by comparing this cp genome with those of other rosid plants. We also constructed phylogenetic trees to demonstrate the phylogenetic position of S. suchowensis in Rosidae based on 66 orthologous protein-coding genes present in the cp genomes of 32 species. Sequencing 30 amplicons based on the pseudomolecule for experimental verification revealed 99.88% accuracy for the S. suchowensis cp genome assembly. Therefore, we assembled a high-quality pseudomolecule of the S. suchowensis cp genome, which is a useful resource for facilitating development of this shrub willow into a more productive bioenergy crop.

关键词： Salix suchowensis Chloroplast Genomestructure Gene content Phylogenetic tree

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

Termite-killing components in Serratia marcescens(SM1)

引用

Journal of forestry Research 2021年第4期32卷 1739-1744页

作者： Renjie Fu Jian Luo Kai Feng Xiaoyu Lu Fang Tang co-innovation center for the sustainable forestry in southern china Nanjing Forestry University college of forestry Nanjing Forestry University

The bacteria,Serratia marcescens(SMI) was previously obtained from the black-winged termite,Odontotermes for mo sanus Shiraki.SMI was highly toxic to O.formosanus,however,the mechanism of toxicity is unclear.In this study,toxicity test results showed that the main components that affected O.formosanus were in a supernatant and that the insecticidal protease in the supernatant resulted in the death of O.formosanus.In addition,zinc sulphate recovery experiments indicated that the metalloproteinases in the supernatant were more harmful.These results provide a theoretical foundation for the future biological control of termites,the basis for the development of pest control technology and the discovery of new pesticides.

关键词： Odontotermes formosanus Shiraki Serratia marcescens strain SM1 Supernatant Protease Metalloproteinases

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

complex effects of different types of acid rain on root growth of Quercus acutissima and Cunninghamia lanceolata saplings

引用

Ecological Processes 2022年第1期11卷 51-64页

作者： Xin Liu Shilin Ma Zhaohui Jia Muhammad Ramzan Miaojing Meng Jinping Wang Chong Li Yinlong Zhang Jinchi Zhang co‑innovation center for sustainable forestry in southern china Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological RestorationNanjing Forestry University159 Longpan RoadNanjing 210037JiangsuChina co‑innovation center for sustainable forestry in southern china Nanjing Forestry University159 Longpan RoadNanjing 210037JiangsuChina

Background:Soil acidification caused by acid rain(AR)can damage plant roots,which in turn negatively impacts plant health.In response to changing AR types,research efforts to elucidate their specific impacts on plants have become intense.Methods:For this study,we investigated the effects of simulated sulfuric,nitric,and mixed AR on the root systems of Quercus acutissima Carr.and Cunninghamia lanceolata(Lamb.)Hook.under different acidity levels.Results:As the AR S/N ratio and pH decreased,the height growth rate(HGR),basal diameter growth rate(DGR),total root length(TRL)and total root surface area(TRS)of C.lanceolata decreased,whereas the TRL and TRS of Q.acutissima remained the same.When the NO_(3)^(−)concentration in AR was increased,the root activity,superoxide dismutase(SOD)and catalase(CAT)activities of C.lanceolata roots revealed a downward trend;however,the root activity of Q.acutissima and the peroxidase(POD)activity of C.lanceolata roots revealed an upward trend.Further,redundant analysis and structural equation models indicated that AR pH had a greater impact on the HGR of Q.acutissima than that of C.lanceolata,while the impact of the AR S/N ratio on C.lanceolata growth rates was greater than that of Q.acutissima.conclusions:Our results suggested that the root systems of different tree species had variable responses to AR,and the AR S/N ratio was an important factor affecting plant root growth.This might facilitate new strategies for the culti‑vation and protection of plantations in the future.

关键词： Sulfuric and nitric acid rain Root growth Root morphology Root activity Antioxidant enzyme activity

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

Effects of Serratia marcescens(SM1) and its interaction with common biocontrol agents on the termite, Odontotermes formosanus(Shiraki)

引用

Journal of forestry Research 2021年第3期32卷 1263-1267页

作者： Renjie Fu Luxiang Zhou Kai Feng Xiaoyu Lu Jian Luo Fang Tang co-innovation center for the sustainable forestry in southern china Nanjing Forestry University college of forestry Nanjing Forestry University

Odontotermes formosanus(Shiraki), a blackwinged subterranean termite, is a common forest pest. A red pigment-producing bacterial strain isolated from the termite was identified as Serratia marcescens and named SM1. A bioassay of SM1 on O. formosanus show that the LD 50 ranged from 1.77 × 10~4 to 10.82 × 10~4 cells/termite over 21–39 h. Three biological control agents, B eauveria bassiana(2 × 1010cells/mL), Metarhizium anisopliae(1 × 1010cells/mL) and Bacillus thuringiensis(1.6 × 10~8 IU/mL), were used for an O. formosanus bioassay. The results show that the insecticidal effect of B. bassiana was stronger than that of M. anisopliae. In addition, two mixtures were obtained by combining B. bassiana(2 × 1010cells/mL) with SM1(1.5 × 1010cells/mL), and M. anisopliae(1 × 1010cells/mL) with S. marcescens(SM1)(1.5 × 1010cells/mL) in equal volumes. The results show that B. bassiana and SM1 was less effective than SM1 alone. However, the insecticidal effect of M. anisopliae and SM1 was better than that of M. anisopliae or SM1 individually. These studies provide an important contribution for termite biocontrol.

关键词： Odontotermes formosanus (Shiraki) Serratia marcescens strain SM1 LD 50 Biological control agents

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Stimulatory effect of lanthanum nitrate on the root tuber yield of Pseudostellaria heterophylla via improved photosynthetic characteristics

引用

Journal of Rare Earths 2017年第6期35卷 610-620页

作者：马迎莉邹慧超谷慧施大伟高文翔张雨峰谢寅峰 Co-Innovation Center for Sustainable Forestry in Southern China college of Biology and the Environment Nanjing forestry University

The stimulatory effects and associated mechanism of lanthanum nitrate on the root tuber yield of the traditional Chinese medicinal plant Pseudostellaria heterophylla, by means of improved photosynthetic characteristics, were investigated. Field experiments were conducted and the foliage was sprayed with varying concentrations of lanthanum nitrate. The results indicated that growth indexes, chlorophyll and carotenoid contents initially increased, and then decreased in a dose-dependent manner with increasing concentrations of lanthanum nitrate. The fresh and dry weights of root tuber yield per unit area significantly increased by 58.34% and 56.87% with a lanthanum nitrate concentration of 100 mg/L, respectively, compared with the control. Appropriate concentrations of lanthanum nitrate were found to alleviate photosynthetic depression at midday, as well as improve the mean values of photosynthetic rate（Pn）, stomatal conductance（Gs） and transpiration rate（Tr） associated with the diurnal variation in photosynthetic parameters, while reducing intercellular co2 concentration（Ci）. During the experiment, the chlorophyll fluorescence parameters Fv/Fm, Fv＇/Fm＇, ΦPSII and qP increased initially and then decreased along with the increasing concentration of lanthanum nitrate, while NPQ followed the opposite trend. correlation analysis revealed that Pn had a significantly positive relationship with seedling height, ground diameter, chlorophyll and carotenoid contents, Gs and ΦPSII, while a negative relationship was observed with Ci and NPQ. Grey relational analysis（GRA） indicated that photosynthetic pigments, ΦPSII and qP were the primary factors impacting photosynthesis. These results suggested that the application of an appropriate concentration of lanthanum nitrate（100 mg/L） was effective in improving growth, root tuber yield and photosynthetic characteristics of Psendoste llaria（P） heterophylla. The regulatory effect of lanthanum nitrate on photosynthesis was related to the promotion of light energy absorption and conversi

关键词： photosynthetic lanthanum nitrate chlorophyll tuber stomatal photosynthesis transpiration PSII seedling

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

Responses of radial growth, wood density and fiber traits to planting space in poplar plantations at a lowland site

引用

Journal of forestry Research 2022年第3期33卷 963-976页

作者： Yanhua Zhang Shengzuo Fang Ye Tian Linlin Wang Yi Lv college of forestry Nanjing Forestry UniversityNanjing210037People’s Republic of China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing210037People’s Republic of China

Poplar is raw material for various panel, paper and fiber products. The 12 sample trees of clone Nanlin-895 from four spacings were destructively harvested after thirteen growing seasons to assess the influence of spacing on radial growth and wood properties. Spacing significantly affected tree-ring width and wood basic density (p correlation analysis showed a significantly negative relationship of tree-ring width to wood basic density, fiber length and fiber width, but a significantly positive relationship to hemicellulose. There was no relationship with cellulose and lignin contents. Based on a comprehensive assessment by the TOPSIS method, the 6 m × 6 m spacing is recommended for producing wood fiber at similar sites in the future.

关键词： Planting density Growth ring Fiber morphology Chemical composition Temporal-spatial variation

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

Changes in soil organic carbon and aggregate stability following a chronosequence of Liriodendron chinense plantations

引用

Journal of forestry Research 2021年第1期32卷 355-362页

作者： Qicong Wu Xianghe Jiang Qianwen Lu Jinbiao Li Jinlin Chen Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China

The objectives for this study were to determine changes in soil organic carbon(SOC)components and water-stable aggregates for soil profi les from diff erent ages of plantations of Liriodendron chinense and to clarify which organic carbon component is more closely associated with the formation and stability of soil aggregates.Three layers of soil(depths 0–20 cm,20–40 cm,40–60 cm)were collected from young,half-mature and mature stages of L.chinense.SOC,readily oxidizable organic carbon,chemically stable organic carbon and aggregate composition were determined.Intermediate stable organic carbon,the microbial quotient and aggregate stability(mean weight diameter)were calculated.SOC and aggregate stability in the L.chinense plantation did not increase linearly with an increase in L.chinense age;rather,they fi rst decreased,then increased with increasing age of L.chinense.The microbial quotient had a negative eff ect on the level of organic carbon and the stability of aggregates,while chemically stable organic carbon had a positive eff ect,which explained 55.0%and 19.3%of the total variation,respectively(P<0.01).Therefore,more attention should be paid of these two indicators in the future.

关键词： Soil organic carbon Aggregate stability Liriodendron chinense plantation Chronosequence Soil depth

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

Structural characterization and comparative analysis of the chloroplast genome of Ginkgo biloba and other gymnosperms

引用

Journal of forestry Research 2021年第2期32卷 765-778页

作者： Xiaoming Yang Tingting Zhou Xiya Su Guibin Wang Xuhui Zhang Qirong Guo Fuliang Cao Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China

Ginkgo biloba is a famous living“fossil”and has played an important role in the evolution of the Plant Kingdom.Here,the complete chloroplast genome of G.biloba was sequenced and analysed.The chloroplast genome was 156,990 bp long and predicted to encode 134 genes including 85 protein-coding genes,41 tRNA genes and 8 rRNA genes.The chloroplast genome has a typical quadripartite structure with a pair of inverted repeat regions(IRa and IRb,17,732 bp),a large(LSC,99,259 bp)and small single(SSC,22,267 bp)copy region.After an extensive comparison to previously published gymnosperm plastomes,the gene content and organisation of G.biloba showed high divergence,although part was relatively conserved.The two typical IR regions in the G.biloba chloroplast genome were relatively shorter because it the ycf2 gene.In addition,it was obvious that the IR regions and gene loss were responsible for changes in chloroplast genome size and structure stability,which influenced plastome evolution in different gymnosperms.Phylogenetic analysis revealed that G.biloba is sister to cycads rather than to gnetophytes,cupressophytes,and Pinaceae.Overall,the study showed that the genomic characteristics of G.biloba would be of great help in the further research on the taxonomy,species identification and evolutionary history of gymnosperms,especially for their position in plant systematics and evolution.

关键词： Ginkgo biloba Chloroplast genome comparative analysis Phylogeny

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

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：