检索结果-南通市图书馆

Interactive effects of carbon dioxide, low temperature, and ultrav｜olet-B radiation on cotton seedling root and shoot morphology and growth

引用

Frontiers of Earth Science 2016年第4期10卷 607-620页

作者： David BRAND Chathurik. WIJEWARDANA Wei GAO k. raja reddy Department of Plant and Soil Sciences Mississippi State University Starkwille MS 39762 USA USDA UVB Monitoring and Research Program Natural Resource Ecology Laboratory and Department of Ecosystem Science and Sustainability Colorado State University Fort Collins CO 80523 USA

Interactive effects of multiple environmental stresses are predicted to have a negative effect on cotton growth and development and these effects will be exacerbated in the future climate. The objectives of this study were to test the hypothesis that cotton cultivars differ in their responses to multiple environmental factors of （CO2） [400 and 750 μ*** 1 （＋（CO2）], temperature [28/20 and 20/12℃ （-T）], and UV-B radiation [0 and 10 k.. m2. d ^-1（＋ UV- B）]. A genetic and molecular standard （TM-1） and three modern cotton cultivars （DP1522B2XE PHY496W3R, and ST4747GLB2） were grown in eight sunlit, controlled environment chambers with control treatment 400 μ***^-1 [CO2], 28/21℃ temperature, and 0 k. UV B. The results showed significant differences among the cultivars for most of the shoot and root parameters. Plants grown under low temperature alone or as a combination with ＋ UV B treatment caused more detrimental effects on root and shoot vigor. Although the elevated CO2 treatments weak.ned the damaging effects of higher UV-B levels on cotton growth on all cultivars, increased CO2 could not mask.the negative effects of low temperature. When comparing all cultivars, genetic standard TM-1 produced the smallest values for the majority of traits under CO2, UV-B, and low temperature either alone or in combination with other treatments. Based on principal component analysis, the four cultivars were classified as tolerant （DP1522B2XF）, intermediate （PHY496W3R and ST4747GLB2） and sensitive （TM-1） to multiple environmental *** temperature was identified as the most damaging treatment to cotton early seedling vigor while elevated CO2 caused the least. Existing variability of cotton cultivars in response tomultiple environmental stresses could allow for selection of cultivars with the best coping ability and higher lint yield for future climate change environments.

关键词： Cotton Climate change winRHIZO Princi-pal component analysis. Stress tolerance.

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

Reproductive Performance and Fiber Quality Responses of Cotton to Potassium Nutrition

引用

American Journal of Plant Sciences 2015年第7期6卷 911-924页

作者： Suresh Lok.ande k. raja reddy Department of Plant and Soil Sciences Mississippi State University Mississippi State MS USA

Potassium (k. deficiency affects cotton growth and development and fiber properties. An experiment was conducted in an outdoor pot culture facility by imposing four potassium stress treatments (100%, 40%, 20% and 0% of optimum k.level) prior to flowering during 2010 and 2011 growing season. Upland cotton cultivar, TM-1, was seeded in the pots comprised of fine sand as rooting medium. Flowers and bolls were tagged daily to estimate boll maturation period (BMP). Leaf samples were collected every four days from flowering to maturity to estimate leaf k.content. Plant height and node numbers were recorded from emergence to 21 days after treatment. Photosynthesis and stomatal conductance were measured week.y from day of treatment imposition to physiological maturity at an interval of seven days. Stem, leaf, and boll dry-component weights, and boll numbers were recorded at the end of the experiment in each year. From each boll, the lint samples were collected and grouped based on average leaf potassium concentration during BMP, and fiber quality parameters were recorded for each group in each treatment. At high k.deficient (0 k. condition, total biomass declined by 27% and 28% in years 2010 and 2011, respectively. Significantly, lower numbers of bolls were retained per plant at 0 k.stress treatment during both the years. Leaf photosynthesis (r2 = 0.92) and stomatal conductance (r2 = 0.80) declined with declining leaf k.levels. Fiber length, strength, micronaire, and uniformity declined linearly with decrease in leaf k.content. Weak.r fibers with medium length were produced under k.deficient conditions with micronaire values in the discount range. Fiber uniformity, however, did not decline with decrease in leaf k. The identified leaf k.status-specific relationships for fiber properties could be used to improve management practices under potassium deficiency and to develop new sub-routines of the existing cotton simulation models. New and improved models will be useful not o

关键词： Boll Maturation Period Cotton Growth Development Fiber Quality Micronaire Fiber Strength Fiber Length Fiber Uniformity Photosynthesis Stomatal Conductance Potassium Nutrition

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

Switchgrass (Panicum virgatum L.) Intraspecific Variation and Thermotolerance Classification Using in Vitro Seed Germination Assay

引用

American Journal of Plant Sciences 2011年第2期2卷 134-147页

作者： Ramdeo Seepaul Bisoondat Macoon k. raja reddy Brian Baldwin Department of Plant and Soil Sciences Mississippi State University Central Mississippi Research and Extension Center

Cardinal temperatures for plant processes have been used for thermotolerance screening of geNotypes, geoclimatic adaptability determination and pheNological prediction. Current simulation models for switchgrass (Panicum virga-tum L.) utilize single cardinal temperatures across geNotypes for both vegetative and reproductive processes although intra-specific variation exists among geNotypes. An experiment was conducted to estimate the cardinal temperatures for seed germination of 14 diverse switchgrass geNotypes and to classify geNotypes for temperature tolerance. Strati-fied seeds of each geNotype were germinated at eight constant temperatures from 10oC to 45oC under a constant light intensity of 35 μmol m-2 s-1 for 12 h d-1. Germination was recorded at 6-h intervals in all treatments. Maximum seed germination (MSG) and germination rate (GR), estimated by fitting Sigmoidal function to germination-time series data, varied among geNotypes. Quadratic and bilinear models best described the MSG and GR responses to temperature, respectively. The mean cardinal temperatures, Tmin, Topt and Tmax, were 8.1, 26.6, and 45.1oC for MSG and 11.1, 33.1, and 46.0oC for GR, respectively. Cardinal temperatures for MSG and GR;however, varied significantly among geNotypes. GeNotypes were classified as sensitive (‘Cave-in-rock., ‘Dacotah’, ‘Expresso’, ‘Forestburg’, ‘k.nlow’, ‘Sunburst’, ‘Trailblazer’, and ‘Warrior’), intermediate (‘Alamo’, ‘Black.ell’, ‘Carthage’, ‘Shawnee’, and ‘Shelter’) and tolerant (‘Summer’) to high temperature based on cumulative temperature response index (CTRI) estimated by summing individual response indices estimated from the MSG and GR cardinal temperatures. Similarly, geNotypes were also classified as sensitive (Alamo, Black.ell, Carthage, Dacotah, Shawnee, Shelter, and Summer), moderately sensitive (Cave-in-rock. Forestburg, k.nlow, Sunburst, and Warrior), moderately tolerant (Trailblazer), and tolerant (Expresso) to low temperatures. The cardinal temperature

关键词： Switchgrass Cardinal Temperature Temperature Tolerance Germination GeNotype Variability Response Index Screening GeNotype Classification

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

Sweetpotato [Ipomoea batatas(L.) Lam.] Response to S-Metolachlor and Rainfall under Three Temperature Regimes

引用

American Journal of Plant Sciences 2015年第5期6卷 702-717页

作者： Issah A. Abuk.ri Mark.W. Shank.e k. raja reddy Pontotoc Ridge-Flatwoods Branch Experiment Station North Mississippi Research and Extension Center Mississippi State University Pontotoc MS USA Department of Plant and Soil Sciences Mississippi State University Mississippi State MS USA

The S-metolachlor is used to control/suppress yellow nutsedge, annual grasses, and several broadleaf weeds in sweetpotato. However, when used under adverse environmental conditions, it may lead to crop injury. Information is limited on the effect of S-metolachlor application followed immediately by rainfall on sweetpotato growth and development under different temperature regimes. The objective of this study was to determine sweetpotato response to S-metolachlor under low, optimum, and high temperatures with no rainfall and rainfall immediately after application. Sweetpotato slips were transplanted to sandy loam soil-filled pots. Half of the pots were subjected to 38 mm rainfall at 50.8 mm·h-1 intensity within the first 24 h after POST-transplant S-metolachlor application at 0, 0.86, 1.72, 2.58 and 3.44 k.·ha-1. The pots were moved into sunlit, computer-controlled plant growth chambers that were maintained at their respective temperatures for 61 days. Plant growth, development and plant-component dry weights and quantity of storage roots were recorded at harvest. Storage root yield was highest at the optimum temperature and declined at low and high temperature conditions. Shoot, root, and total plant biomass yield declined with increasing concentration of S-metolachlor across temperature conditions. In addition, storage root yield decline was S-metolachlor rate-dependent and aggravated by a rainfall event immediately after herbicide treatment across temperatures tested. These results can be used to weigh the risk.of potential crop injury against the benefits of S-metolachlor when mak.ng management decisions as well as considering weather forecast information to avoid herbicide application coinciding with adverse weather conditions such as excessive rainfall event.

关键词： Growth Development Rainfall Temperature S-Metolachlor Storage Roots Sweetpotato

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

Ultraviolet-B Radiation Alters Soybean Growth and Seed Quality

引用

Food and Nutrition Sciences 2016年第1期7卷 55-66页

作者： k. raja reddy Hrusik.sh Patro Suresh Lok.ande Nacer Bellaloui Wei Gao Department of Plant and Soil Sciences Mississippi State University Mississippi State USA Department of Agronomy Orissa University of Agriculture & Technology Bhubaneswar India Department of Sociology Iowa State University Ames USA Crop Genetics Research Unit USDA-ARS Stoneville USA 5USDA-UV-B Monitoring Network Natural Resource Ecology Lab Colorado State University Fort Collins USA USDA-UV-B Monitoring Network Natural Resource Ecology Lab Colorado State University Fort Collins USA

Research on the effects of ultraviolet-B (UV-B) radiation on soybean seed quality is limited. The objective of this study was to quantify UV-B doses, 0, 5, 10 & 15 k.•m–2•d–1, on soybean growth and seed quality. The experiment was conducted in the Soil-Plant-Atmosphere-Research (SPAR) facility. Chambers located at the R.R. Foil Plant Science Research Facility of Mississippi State University, Mississippi, USA, were used. Each SPAR chamber consists of a steel soil bin to accommodate the root system, a Plexiglas chamber to accommodate plant canopy and a heating, and cooling system connected to air ducts that pass conditioned air to cause leaf flutter through the plant canopy. The SPAR units, supported by an environmental monitoring and control systems, are network.d to provide automatic acquisition and storage of the data, monitored every 10 seconds throughout the day and night. Soybean cultivar Pioneer 93Y92 (maturity group IV, Roundup Ready) was used in the study. The desired UV-B radiation was supplied by square-wave UV-B supplementation systems under near ambient PAR and delivered to plants for eight hours, each day, from 08:00 to 16:00 h by eight fluorescent UV-313 lamps. The results showed that increased UV-B did not influence many of the growth parameters because the treatments were imposed at mid-fruiting period. Seed quality parameters that are important for seed industry and human and animal nutrition were all affected by UV-B. Protein and palmitic and oleic acids declined linearly, while oil and linoleic and linolenic acid contents increased with increased UV-B. Sucrose, stachyose, and stearic acid contents showed quadratic trends, increased to about 4 - 5 k. of UV-B and declined at higher doses. Thus, both current and projected UV-B radiation levels can modify soybean growth and seed quality. The functional algorithms developed in this study could be useful to develop UV-B- specific sub-models for soybean farm management and

关键词： Ultraviolet Radiation Biomass Parameter Seed Quality Soybean Nutrition Seed Composition

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

Nitrogen Application Rate and Genotype Effects on Switchgrass Production and Chemical Characteristics

引用

American Journal of Plant Sciences 2016年第3期7卷 533-546页

作者： Ramdeo Seepaul Bisoondat Macoon k. raja reddy William B. Evans North Florida Research & Education Center University of Florida Quincy FL USA Mississippi State University Central MS REC Raymond MS USA Department of Plant and Soil Sciences Mississippi State University Mississippi State MS USA Truck.Crops Branch Experiment Station Mississippi State University Crystal Springs MS USA

Switchgrass (Panicum virgatum L.) is considered as an important biofuel crop but further studies on factors that may have an effect on agronomic performance and energy attributes are needed to help elucidate management strategies for the crop. A 2-yr field study at the Brown Loam Branch Experiment Station, Raymond, Mississippi, USA, quantified the effects of four N application rates and four genotypes on biomass yield, ethanol yield, and nutrient removal of switchgrass. Biomass yield response to N rate was linear in 2008 and quadratic in 2009. Among genotypes, biomass yield averaged across N rate and years, rank.d lowland NF/GA992 (13.9 Mg·ha-1) = lowland NF/GA001 (13.4 Mg·ha-1) > lowland Alamo (11.5 Mg·ha-1) > upland Cave-in-Rock.(6.1 Mg·ha-1). There was no effect of N rate on tissue mineral concentrations but there was an N rate effect on Ca and Mg removal. Also, N use (biomass yield produced per unit N applied) and recovery (N removed in biomass) declined as N rate increased. Total ethanol yield was the greatest in Alamo (165.8 L·Mg-1) and averaged 162.0 L·Mg-1 for the other three genotypes. Total ethanol production was related more to biomass yield than chemical composition differences and was similar among lowland genotypes but different from Cave-in-Rock.in 2008 (1.7 vs. 0.9 k.·ha-1) and 2009 (2.6 vs. 1.1 k.·ha-1). Feedstock.grown from lowland Alamo, NF/GA001 or NF/GA992 produced greater biomass yield and ethanol as well as greater N use efficiency and recovery. These results indicate that there is opportunity to increase switchgrass biomass production through genotype selection and N management.

关键词： Nitrogen Use Biofuel Ethanol Nutrient Removal Biomass

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

Morpho-Physiological Characterization of Glyphosate-Resistant and -Susceptible Horseweed (Conyza canadensis) Biotypes of US Midsouth

引用

American Journal of Plant Sciences 2015年第1期6卷 47-56页

作者： Vijay k. Nandula Daniel H. Poston Clifford H. k.ger k.ishna N. reddy k. raja reddy US Department of Agriculture-Agricultural Research Service (USDA-ARS) Crop Production Systems Research Unit Stoneville MS USA Pioneer Hi-Bred International—Southern Business Unit Huntsville AL USA Silent Shade Planting Company Belzoni MS USA Department of Plant and Soil Sciences Mississippi State University Mississippi State MS USA

Horseweed is traditionally considered a non-cropland weed. However, populations resistant to glyphosate have eventually become established in no-till agronomic cropping systems. Growth chamber and greenhouse experiments were conducted to compare selected biological and physiological parameters of glyphosate-resistant (GR) and -susceptible (GS) horseweed biotypes from Mississippi with a broader goal of fitness characterization in these biotypes. Vegetative growth parameters (number of leaves, rosette diameter and area, shoot and root fresh weights) were recorded week.y from 5 to 11 wk.after emergence and reproductive attributes [days to bolting (production of a flowering stalk. and flowering] and senescence were measured for both GR and GS biotypes under high (24°C/20°C) and low (18°C/12°C) temperature regimes, both with a 13-h light period. Physiological traits such as net photosynthesis, phenolic content, and cell membrane thermostability, all in the presence and absence of glyphosate, and leaf content of divalent cations such as Ca2+ and Mg2+ were assayed in the two biotypes under the high temperature regime. All horseweed vegetative growth parameters except root fresh weight were higher in the high temperature regime compared to that in low temperature regime in both biotypes. Number of leaves, rosette diameter and area, shoot and root fresh weight were 40 vs. 35, 9.3 vs. 8.7 cm, 51 vs. 43 cm2, 3.7 vs. 3.2 g, and 3.5 vs. 4.2 g under high and low temperature conditions, respectively, when averaged across biotypes and week.y measurements. All growth parameters listed above were higher for the GR biotype compared to the GS biotype. Number of leaves, rosette diameter and area, shoot and root fresh weight were 38 vs. 37, 9.1 vs. 8.9 cm, 50.2 vs. 44 cm2, 3.9 vs. 3.1 g, and 4.3 vs. 3.5 g for GR and GS biotypes, respectively, averaged across the temperature treatments and week.y measurements. Reproductive developmental data of these biotypes indicated that the GS biotype

关键词： Conyza canadensis Glyphosate Growth Fitness Horseweed Resistance

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

Impacts of S-Metolachlor Application Timing on Sweetpotato Growth and Development

引用

American Journal of Plant Sciences 2019年第5期10卷 780-795页

作者： Issah A. Abuk.ri Mark.W. Shank.e k. raja reddy Stephen L. Meyers Wei Gao Department of Plant and Soil Sciences 117 Dorman Hall Mississippi State University Mississippi State MS USA Pontotoc Ridge-Flatwoods Branch Experiment Station North Mississippi Research and Extension Center Pontotoc MS USA USDA UVB Monitoring and Research Program Natural Resource Ecology Laboratory and Department of Ecosystem Science and Sustainability Colorado State University Fort Collins CO USA

S-metolachlor is used to control/suppress yellow nutsedge, annual grasses and several broadleaf weeds in sweetpotato. However, a decline in storage root quality is suspected when excessive rainfall occurs within 24-h after application. A greenhouse study was conducted to determine the effect of S-metolachlor application timing on sweetpotato growth and development. S-metolachlor treatments (0 and 1 k.·ha-1) were applied over-the-top at 0, 5 and ten days after transplanting (DAT) and a simulated rainfall treatment delivered 25 mm of rain, 51 mm·h-1 intensity, immediately after herbicide application. Plants were harvested at 5, 10, 15, 20 and 80 DAT. During the first four harvests, roots were scanned and analyzed with WinRHIZO-Pro image analysis system to estimate root number, length, volume, and surface area along with aboveground growth parameters. At the final harvest, plant growth and biomass components, and quality of storage roots were recorded. Plants treated with S-metolachlor on day 0 and 5 DAT were significantly less than those of 10 DAT and untreated control for all measured parameters for the initial 20 days of plant growth. Even though vine length, leaf number, stem biomass, and total storage roots were not different among the treatments at 80 DAT, all other plant components and total biomass production and leaf area development for plants treated at 0 and 5 DAT were significantly (P k.table storage root conversion efficiency declined by 18% and 16% for plants treated at 0 and 5 DAT, respectively, relative to the untreated check. These results indicate that delaying S-metolachlor application to 10 DAT will be less damaging to sweetpotato growth and development, particularly mark.table storage roots and yield.

关键词： Adventitious Root Development Growth Herbicide Phytotoxicity Injury Mark.table Storage Roots Sweetpotato

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

Quantifying and Validating Soybean Seed Emergence Model as a Function of Temperature

引用

American Journal of Plant Sciences 2019年第1期10卷 111-124页

作者： Firas Ahmed Alsajri Chathurik. Wijewardana L. Jason k.utz J. Trenton Irby Bobby Golden k. raja reddy Department of Plant and Soil Sciences Mississippi State University Mississippi State MS USA Mississippi Water Resources Research Institute Mississippi State University Mississippi State MS USA Delta Research and Extension Center Stoneville MS USA

Developing a model for soybean seed emergence offers a tool producers could use for planting date options and in predicting seedling emergence. In this study, temperature effects on soybean seed emergence were quantified, modeled, and validated. The data for seed emergence model development was generated at varying temperatures, 20°C/12°C, 25°C/17°C, 30°C/22°C, 35°C/27°C, and 40°C/32°C, on two soybean cultivars, Asgrow AG5332 and Progeny P 5333 RY. Time for 50% emergence (t50%) was recorded, and seed emergence rate (SER) was estimated as reciprocal to time at each temperature in both the cultivars. No differences were observed between the cultivars in their response to temperature. A quadratic model (QM) best described the relationship between t50% and SGR and temperature (R2 = 0.93). Two sets of experiments were conducted to validate the model. In Experiment 1, 17 time-series planting date studies with the same cultivars were used by utilizing diurnal and seasonal changes in temperature conditions. In the second experiment, sunlit growth chambers with 3 different day/night temperatures, low—20°C/12°C, optimum—30°C/22°C, and high—40°C/32°C, and 64 soybean cultivars belonging MG III, IV, and V, were used. Air temperature and t50 were recorded, and SGR was estimated in all experiments. No differences were recorded among the cultivars for t50% and SGR, but differences were observed among seeding date and temperature experiments. We tested QM and traditionally used Growing Degree Days models against the data collected in validation experiments. Both the model simulations predictions agreed closely with the observed data. Based on model statistics, R2, root mean square errors (RMSE), and comparison of observations and predictions to assess model performance, the QM model performed better than the GDD model for soybean seed emergence under a wide range of cultivars and environmental conditions.

关键词： Growing Degree Days Model Seed Emergence Soybean Temperature

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

Trusted Certified Auditor Using Cryptography for Secure Data Outsourcing and Privacy Preservation in Fog-Enabled VANETs

引用

Computers, Materials & Continua 2024年第5期79卷 3089-3110页

作者： Nagaraju Pacharla k.Srinivasa reddy School of Computer Science and Engineering VIT-AP UniversityAmaravatiAndhra Pradesh522237India

With the recent technological developments,massive vehicular ad hoc network.(VANETs)have been established,enabling numerous vehicles and their respective Road Side Unit(RSU)components to communicate with *** best way to enhance traffic flow for vehicles and traffic management departments is to share thedata they *** needs to be more protection for the VANET *** effective and safe methodof outsourcing is suggested,which reduces computation costs by achieving data security using a homomorphicmapping based on the conjugate operation of *** research proposes a VANET-based data outsourcingsystem to fix the *** k.ep data outsourcing secure,the suggested model tak.s cryptography models *** will k.ep the generated k.ys for the purpose of vehicle *** controlling and overseeingthe outsourced data while preserving privacy,the suggested approach considers the Trusted Certified Auditor(TCA).Using the secret k.y,TCA can identify the genuine identity of VANETs when harmful messages *** proposed model develops a TCA-based unique static vehicle labeling system using cryptography(TCA-USVLC)for secure data outsourcing and privacy preservation in *** proposed model calculatesthe trust of vehicles in 16 ms for an average of 180 vehicles and achieves 98.6%accuracy for data encryption toprovide *** proposedmodel achieved 98.5%accuracy in data outsourcing and 98.6%accuracy in privacypreservation in fog-enabled *** curve cryptography models can be applied in the future for betterencryption and decryption rates with lightweight cryptography operations.

关键词： Vehicular ad-hoc network. data outsourcing privacy preservation cryptography k.ys trusted certified auditors data security

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：