检索结果-南通市图书馆

Exogenously applied glycinebetaine induced alteration in some key physio-biochemical attributes and plant anatomical features in water stressed oat(Avena sativa L.) plants

引用

Journal of Arid Land 2019年第2期11卷 292-305页

作者： Anum SHEHZADI Nudrat A AKRAM Ayaz ALI Muhammad ASHRAF department of botany Government College University Pakistan Science Foundation department of botany King Saud University

Although exogenous application of glycinebetaine(GB) is widely reported to regulate a myriad of physio-biochemical attributes in plants under stressful environments including drought stress, there is little information available in the literature on how and up to what extent GB can induce changes in anatomical features in water starved plants. Thus, the present research work was conducted to assess the GB-induced changes in growth, physio-biochemical, and anatomical characteristics in two cultivars(CK-1 and F-411) of oat(Avena sativa L.) under limited water supply. After exposure to water stress, a considerable reduction was observed in plant growth in terms of lengths and weights of shoot and roots,leaf mesophyll thickness, leaf midrib thickness, root cortex thickness, root diameter, stem diameter, stem phloem area, and stem vascular bundle area in both oat cultivars. However, water stress resulted in a significant increase in leaf total phenolics, hydrogen peroxide(H_2 O_2), ascorbic acid(AsA), GB contents,activities of enzymes(CAT, SOD and POD), total soluble proteins, leaf epidermis(abaxial and adaxial)thickness, bulliform cell area, sclerenchyma thickness, root endodermis and epidermis thickness, root metaxylem area, stem metaxylem area and stem sclerenchyma thickness in both oat ***-applied 100 mM GB suppressed H_2 O_2 contents, while improved growth attributes, free proline and GB contents, activity of SOD enzyme, leaf abaxial epidermis thickness, leaf bulliform cell area, leaf midrib thickness, leaf sclerenchyma thickness, root cortex thickness, root endodermis, epidermis thickness,root stele diameter, stem diameter, stem epidermis thickness, stem metaxylem area, and stem phloem and vascular bundle area in both oat cultivars. For both oat cultivars, CK-1 was superior to F-411 in leaf abaxial epidermis thickness, leaf mesophyll, leaf sclerenchyma, root metaxylem area, stem diameter, stem epidermis, sclerenchyma thickness, stem metaxylem area, and

关键词： drought tolerance anatomical features oat glycinebetaine antioxidants

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

DNA barcoding of Pedicularis L.(Orobanchaceae):Evaluating four universal barcode loci in a large and hemiparasitic genus

引用

Journal of Systematics and Evolution 2011年第5期49卷 425-437页

作者： Richard H.REE department of botany Field Museum of Natural History

One application of DNA barcoding is species identification based on sequences of a short and standardized DNA *** plants,various DNA regions,alone or in combination,have been proposed and investigated,but consensus on a universal plant barcode remains *** this study,we tested the utility of four candidate barcoding regions(rbcL,matK,trnH-psbA,and internal transcribed spacer(ITS)) as DNA barcodes for discriminating species in a large and hemiparasitic genus Pedicularis(Orobanchaceae).Amplification and sequencing was successful using single primer pairs for rbcL,trnH-psbA,and ITS,whereas two primer pairs were required for *** of sequence divergence commonly showed a "barcoding gap",that is,a bimodal frequency distribution of pairwise distances representing genetic diversity within and between species,*** primer universality,ease of amplification and sequencing,and performance in discriminating species,we found the most effective single-region barcode for Pedicularis to be ITS,and the most effective two-region barcode to be rbcL + *** discriminated at least 78% of the 88 species and correctly identified at least 89% of the sequences in our sample,and were effective in placing unidentified samples in known species *** results suggest that DNA barcoding has the potential to aid taxonomic research in Pedicularis,a species-rich cosmopolitan clade much in need of revision,as well as ecological studies in its center of diversity,the Hengduan Mountains region of China.

关键词： DNA barcode Hengduan Mountains region ITS Pedicularis rbcL species identification.

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

Pollen morphology of the family Cistaceae in Egypt and its systematic significance

引用

Journal of Systematics and Evolution 2011年第4期49卷 362-371页

作者： Nasr M.HASSAN botany department Faculty of ScienceAssiut University

The pollen morphology of 11 species (including two subspecies and two varieties) belonging to two genera (Helianthemum and Fumana) of the family Cistaceae in Egypt was studied using light and scanning electron *** grains of the studied taxa were found to be radially symmetrical and *** size,shape,apertures,and exine ornamentation characteristics were valuable parameters among the studied *** largest pollen size was recorded in *** and the smallest one observed in *** ***- *** shape in the Egyptian taxa varied from (sub-)prolate to prolate spheroidal,but *** is different in having sub-oblate *** pollen data confirm that *** and *** are very closely related *** sculpture was useful in distinguishing between *** *** and *** *** main pollen types of exine ornamentation were recognized: retipilate;reticulate to verrucate;and *** on palynological data,a key for the studied taxa is suggested.

关键词： Cistaceae exine sculpture palynology scanning electron microscopy.

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

2D CaWO4 nanosheets derived from scheelite minerals for enhanced electrocatalysis in oxygen evolution reaction

引用

Science China Chemistry 2025年

作者： Qing Sun Yongxiang Sun Yan Dong Hong Zhong Hongbo Zeng National&Local United Engineering Laboratory for New Petrochemical Materials&Fine Utilization of Resources College of Chemistry and Chemical EngineeringHunan Normal University department of Chemical and Materials Engineering University of Alberta College of Chemistry and Materials Engineering Hunan University of Arts and Science College of Chemistry and Chemical Engineering Central South University

Scheelite （CaWO4） mineral holds promise as a cost-effective and efficient catalyst for the oxygen evolution reaction （OER）crucial in renewable energy ***,challenges such as limited active site exposure and low electrocatalytic performance need *** this work,we have fabricated two-dimensional （2D） CaWO4nanosheets from scheelite minerals via a straightforward ultrasonic exfoliation method and evaluated their efficacy as OER *** to scheelite powders,these 2D nanosheets exhibited superior crystallinity and a 1.26-fold increase in electrochemical surface area,promoting active site *** 2D CaWO4nanosheet electrode demonstrated outstanding OER catalytic performance,achieving a current density of 20 mA/cm2at an overpotential of 290 m V in alkaline conditions,which was lower than that of bulk CaWO4electrodes （～340 mV）.Density functional theory calculations attributed this enhanced catalytic performance to moderate adsorption of oxygenated intermediates （*OH,*O,and*OOH） on the W sites of 2D *** situ electrochemical atomic force microscopy tests also confirmed the catalytic enhancement by 2D CaWO4nanosheets during *** findings demonstrate the potential of affordable and abundant mineral resources in advancing electrochemical catalysts for oxygen evolution,highlighting their broader application in sustainable energy technologies.

关键词：

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

Micropropagation of yellow mangosteen:a valuable endemic tree of India

引用

Journal of Forestry Research 2016年第1期27卷 161-165页

作者： Lalita Mahantagouda Patil Hosakatte Niranjana Murthy Vijayalaxmi S.Dandin Sunita P.Koli Shirugumbi Hanamanthagouda Manohar Shivanand D.Payamalle department of botany Karnatak University

We developed a method for in vitro regenera- tion of Garcinia xanthochymus （yellow mangosteen） from matured seed segments. Multiple shoots were induced on woody plant （WP） medium supplemented with cytokinins. An average of 11 shoots per explant were regenerated from mature seed segments on WP medium containing 20 μM 6-benzylaminopurine. Histological analysis revealed that hypodermal cells of seed segments were initially involved in active division, which later developed into meriste- moids, subsequently leading to the formation of shoot buds. Shoot elongation was achieved by repeated subculturing of seed explants in shoot regeneration medium. Rooting of shoots was achieved on WP medium supplemented with indole-3-butyric acid or s-naphthalene acetic acid. Plant- lets were transplanted to pots containing soil： compost （1：1） and survival rate was 90 %.

关键词： Adventitious shoots Garcinia xanthochymus.In vitro propagation Tissue culture WP medium

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

Phylogenetic biogeography and taxonomy of disjunctly distributed bryophytes

引用

Journal of Systematics and Evolution 2009年第5期47卷 497-508页

作者： Jochen HEINRICHS Jrn HENTSCHEL Kathrin FELDBERG Andrea BOMBOSCH Harald SCHNEIDER department of Systematic botany Albrecht von Haller Institute of Plant SciencesGeorg-August-University botany department Natural History Museum

More than 200 research papers on the molecular phylogeny and phylogenetic biogeography of bryophytes have been published since the beginning of this *** papers corroborated assumptions of a complex genetic structure of morphologically circumscribed bryophytes,and raised reservations against many morphologically justified species concepts,especially within the ***,many molecular studies allowed for corrections and modifications of morphological classification *** studies reported that the phylogenetic structure of disjunctly distributed bryophyte species reflects their geographical ranges rather than morphological *** data led to new appraisals of distribution ranges and allowed for the reconstruction of refugia and migration *** ranges of bryophytes are often caused by dispersal rather than geographical *** distribution patterns of disjunct bryophytes are likely formed by processes such as short distance dispersal,rare long distance dispersal events,extinction,recolonization and diversification.

关键词： bryophytes cryptic speciation disjunctions divergence time estimates Diversity Arrays Technology DNA sequence variation isozymes molecular phylogeny.

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

Implications of multipurpose tree leaf application on wheat productivity in dry tropics

引用

Journal of Forestry Research 2013年第4期24卷 777-782页

作者： Rajani Srivastava K.P.Singh department of botany Banaras Hindu University

Leaves of multipurpose tree species （those providing more than one function or product of human use） can serve as sources of fer- tilizer for nutrient supply, especially nitrogen （N）. In this study chopped leaves of tropical tree species （5 N-fixing species, 5 non-N-fixing species and combinations of 5 N-fixing with a non-N-fixing species） were in- corporated in soil to evaluate its effects on wheat biological productivity （including grain yield, GyIELD） under dryland conditions. High quality leaves of N-fixing tree species （e.g. Dalbergia sissoo, Cassia fistula and Prosopis cineraria） had lower carbon/nitrogen （C/N）, lignin/nitrogen （L^o/N）, polyphenol/nitrogen （PPt/N） and lignin＋polyphenol /nitrogen （L~＋PpL/N） ratios than low quality leaves of non-N-fixing species. Com- bination treatments had intermediate values of different parameters, Application of high quality leaves caused greater increases in wheat productivity and yield than other species.

关键词： multipurpose tree leaves chemical quality index grain yield,N-fixing species non-N fixing species Dryland agriculture

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

Vegetation-environment relationships in the forests of Chitral district Hindukush range of Pakistan

引用

Journal of Forestry Research 2013年第2期24卷 205-216页

作者： Nasrullah Khan Syed Shahid Shaukat Moinuddin Ahmed Muhammad Faheem Siddiqui department of botany University of Malakand Dept. of botany University of Karachi Laboratory of Dendrochronology and Plant Ecology department of botany Federal Urdu University of Arts Science and Technology

We investigated the composition of plant communities to quantify their relationships with environmental parameters in the Chitral Hindukush range of Pakistan. We sampled tree vegetation using the Point Centered Quarter （PCQ） method while understory vegetation was sampled in 1.5-m circular quadrats. Cedrus deodara is the national symbol of Pakistan and was dominant in the sampled communities. Because environmental variables determine vegetation types, we analyzed and evaluated edaphic and topographic factors. DCA-Ordination showed the major gradient as an amalgam of elevation （p〈0.05） and slope （p〈0.01） as the topographic factors correlated with species distribution. Soil variables were the factors of environmental significance along DCA axes. However, among these factors, Mg2＋ , K ＋ and N2＋ contributed not more than 0.054% 0.20% and 0.073%, respectively, to variation along the first ordination axis. We conclude that the principal reason for weak or no correlation with many edaphic variables was the anthropogenic disturbance of vegetation. The understory vegetation was composed of perennial herbs in most communities and was most dense under the tree canopy. The understory vegetation strongly regulates tree seedling growth and regeneration patterns. We recommend further study of the understory vegetation using permanent plots to aid development of forest regeneration strategies.

关键词： environmental relationship multivariate analysis cluster analysis ordination anthropogenic factors forest, Hindukush range

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

Free-radical scavenging properties of low molecular weight peptide(s) isolated from S1 cultivar of mulberry leaves and their impact on Bombyx mori(L.)(Bombycidae)

引用

Journal of Animal Science and Biotechnology 2014年第3期5卷 348-356页

作者： Suchisree Jha Palash Mandal Phalguni Bhattacharyya Amitava Ghosh department of botany University of North BengalSiliguri 734013West BengalIndia department of botany University of North Bengal department of botany Malda CollegeUniversity of Gour Banga department of botany Asutosh College

The mulberry leaves have been considered as a sole food source for silkworm, Bombyx mori （L.）. In present work an attempt was made to investigate the role of low molecular weight peptide（s） isolated from mulberry leaves on silkworm rearing. Also we have tried to find out the role of free-radical scavenging activities of isolated peptide（s） on silkworm growth. Larval growth rate was found effective under the influence of peptide（s）. Consumption rate of larvae after peptide（s） treatment on mulberry leaves was significantly enhanced over control. High antioxidant activity was found in Low molecular weight peptide（s） which have an effect on silkworm.

关键词： Antioxidant HPLC Low molecular peptide(s) Mulberry leaf Silkworm

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

Photosynthesis, Growth and Antioxidant Metabolism in Mustard (Brassica juncea L.) Cultivars Differing in Cadmium Tolerance

引用

Agricultural Sciences in China 2010年第4期9卷 519-527页

作者： Noushina Iqbal Asim Masood Rahat Nazar Shabina Syeed Nafees A Khan department of botany Aligarh Muslim University

Two mustard （Brassica juncea L. Czern and Coss.） cultivars, Pusa Jai Kisan and SS2 differing in cadmium （Cd） tolerance were treated with 0, 25 and 50 umol L-1 Cd to study the physiological basis of difference in Cd tolerance. Cultivar SS2 （Cd sensitive） accumulated greater Cd in leaves than Pusa Jai Kisan （Cd tolerant）. Further, SS2 also exhibited higher contents of thiobarbituric acid reactive substances （TBARS） and H2O2 and electrolyte leakage. However, the activities of antioxidant enzymes, catalase （CAT）, ascorbate peroxidase （APX）, dehydroascorbate reduetase （DHAR）, and glutathione reductase （GR） were higher in Pusa Jai Kisan than those in SS2. Contrarily, the activity of superoxide dismutase （SOD） was higher in SS2 than that in Pusa Jai Kisan and was the greatest at 25 umol L-1 Cd. Treatment of 25 umol L-1 Cd induced the maximum activity of enzymes. However, the activity of GR increased up to 50 umol L-1 Cd in both the cultivars. The non-enzymatic antioxidants ascorbate （AsA） and glutathione （GSH） were higher in Pusa Jai Kisan than that in SS2, whereas dehydroascorbate （DHA） and oxidized glutathione （GSSG） were higher in SS2. Photosynthesis and growth were adversely and maximally decreased by 50 umol L-1 Cd treatment in both the cultivars, but SS2 exhibited greater reductions. The protection of photosynthesis and growth and lesser reduction in Pusa Jai Kisan were associated with its capacity to restrict accumulation of Cd in leaves resulting in lower level of TBARS and H2O2 and electrolyte leakage. Moreover, Pusa Jai Kisan exhibited efficient antioxidant metabolism for removal of Cd-induced reactive oxygen species.

关键词： antioxidant metabolism cadmium oxidative stress photosynthesis

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：