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Plant Methods

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https://www.readbyqxmd.com/read/28638439/non-invasive-absolute-measurement-of-leaf-water-content-using-terahertz-quantum-cascade-lasers
#1
Lorenzo Baldacci, Mario Pagano, Luca Masini, Alessandra Toncelli, Giorgio Carelli, Paolo Storchi, Alessandro Tredicucci
BACKGROUND: Plant water resource management is one of the main future challenges to fight recent climatic changes. The knowledge of the plant water content could be indispensable for water saving strategies. Terahertz spectroscopic techniques are particularly promising as a non-invasive tool for measuring leaf water content, thanks to the high predominance of the water contribution to the total leaf absorption. Terahertz quantum cascade lasers (THz QCL) are one of the most successful sources of THz radiation...
2017: Plant Methods
https://www.readbyqxmd.com/read/28638438/real-time-monitoring-of-ptahmgb-activity-in-poplar-transactivation-assays
#2
José M Ramos-Sánchez, Paolo M Triozzi, Alicia Moreno-Cortés, Daniel Conde, Mariano Perales, Isabel Allona
BACKGROUND: Precise control of gene expression is essential to synchronize plant development with the environment. In perennial plants, transcriptional regulation remains poorly understood, mainly due to the long time required to perform functional studies. Transcriptional reporters based on luciferase have been useful to study circadian and diurnal regulation of gene expression, both by transcription factors and chromatin remodelers. The high mobility group proteins are considered transcriptional chaperones that also modify the chromatin architecture...
2017: Plant Methods
https://www.readbyqxmd.com/read/28638437/a-multiplex-pcr-for-rapid-identification-of-brassica-species-in-the-triangle-of-u
#3
Joshua C O Koh, Denise M Barbulescu, Sally Norton, Bob Redden, Phil A Salisbury, Sukhjiwan Kaur, Noel Cogan, Anthony T Slater
BACKGROUND: Within the Brassicaceae, six species from the genus Brassica are widely cultivated throughout the world as oilseed, condiment, fodder or vegetable crops. The genetic relationships among the six Brassica species are described by U's triangle model. Extensive shared traits and diverse morphotypes among Brassica species make identification and classification based on phenotypic data alone challenging and unreliable, especially when dealing with large germplasm collections. Consequently, a major issue for genebank collections is ensuring the correct identification of species...
2017: Plant Methods
https://www.readbyqxmd.com/read/28638436/in-vivo-label-free-mapping-of-the-effect-of-a-photosystem-ii-inhibiting-herbicide-in-plants-using-chlorophyll-fluorescence-lifetime
#4
Elizabeth Noble, Sunil Kumar, Frederik G Görlitz, Chris Stain, Chris Dunsby, Paul M W French
BACKGROUND: In order to better understand and improve the mode of action of agrochemicals, it is useful to be able to visualize their uptake and distribution in vivo, non-invasively and, ideally, in the field. Here we explore the potential of plant autofluorescence (specifically chlorophyll fluorescence) to provide a readout of herbicide action across the scales utilising multiphoton-excited fluorescence lifetime imaging, wide-field single-photon excited fluorescence lifetime imaging and single point fluorescence lifetime measurements via a fibre-optic probe...
2017: Plant Methods
https://www.readbyqxmd.com/read/28630643/improved-classification-accuracy-of-powdery-mildew-infection-levels-of-wine-grapes-by-spatial-spectral-analysis-of-hyperspectral-images
#5
Uwe Knauer, Andrea Matros, Tijana Petrovic, Timothy Zanker, Eileen S Scott, Udo Seiffert
BACKGROUND: Hyperspectral imaging is an emerging means of assessing plant vitality, stress parameters, nutrition status, and diseases. Extraction of target values from the high-dimensional datasets either relies on pixel-wise processing of the full spectral information, appropriate selection of individual bands, or calculation of spectral indices. Limitations of such approaches are reduced classification accuracy, reduced robustness due to spatial variation of the spectral information across the surface of the objects measured as well as a loss of information intrinsic to band selection and use of spectral indices...
2017: Plant Methods
https://www.readbyqxmd.com/read/28592987/an-efficient-protocol-for-perennial-ryegrass-mesophyll-protoplast-isolation-and-transformation-and-its-application-on-interaction-study-between-lpnol-and-lpnyc1
#6
Guohui Yu, Qiang Cheng, Zheni Xie, Bin Xu, Bingru Huang, Bingyu Zhao
BACKGROUND: Perennial ryegrass (Lolium perenne L.) is an important temperate grass used for turf and forage purposes. With the increasing accumulation of genomic and transcriptomic data of perennial ryegrass, an efficient protoplast and transient gene expression protocol is highly desirable for in vivo gene functional studies in its homologous system. RESULTS: In this report, a highly efficient protoplast isolation (5.6 × 10(7) protoplasts per gram of leaf material) and transient expression (plasmid transformation efficiency at 55...
2017: Plant Methods
https://www.readbyqxmd.com/read/28572833/development-of-high-throughput-methods-to-screen-disease-caused-by-rhizoctonia-solani-ag-2-1-in-oilseed-rape
#7
Fryni Drizou, Neil S Graham, Toby J A Bruce, Rumiana V Ray
BACKGROUND: Rhizoctonia solani (Kühn) is a soil-borne, necrotrophic fungus causing damping off, root rot and stem canker in many cultivated plants worldwide. Oilseed rape (OSR, Brassica napus) is the primary host for anastomosis group (AG) 2-1 of R. solani causing pre- and post-emergence damping-off resulting in death of seedlings and impaired crop establishment. Presently, there are no known resistant OSR genotypes and the main methods for disease control are fungicide seed treatments and cultural practices...
2017: Plant Methods
https://www.readbyqxmd.com/read/28546825/efficient-isolation-of-magnolia-protoplasts-and-the-application-to-subcellular-localization-of-mdehsf1
#8
Yamei Shen, Dong Meng, Kim McGrouther, Junhong Zhang, Lailiang Cheng
BACKGROUND: Magnolia is a woody ornamental plant, which is widely used in urban landscaping. However, its lengthy juvenile period and recalcitrance to regeneration impedes functional characterization of its genes. RESULTS: We developed an efficient protoplast isolation and transient expression system for Magnolia denudata × Magnolia acuminata 'Yellow River'. The highest yield of protoplasts was obtained from young leaves digested in 3% Cellulase R10, 0.8% Macerozyme R10, 0...
2017: Plant Methods
https://www.readbyqxmd.com/read/28546824/high-spatio-temporal-resolution-detection-of-chlorophyll-fluorescence-dynamics-from-a-single-chloroplast-with-confocal-imaging-fluorometer
#9
Yi-Chin Tseng, Shi-Wei Chu
BACKGROUND: Chlorophyll fluorescence (CF) is a key indicator to study plant physiology or photosynthesis efficiency. Conventionally, CF is characterized by fluorometers, which only allows ensemble measurement through wide-field detection. For imaging fluorometers, the typical spatial and temporal resolutions are on the order of millimeter and second, far from enough to study cellular/sub-cellular CF dynamics. In addition, due to the lack of optical sectioning capability, conventional imaging fluorometers cannot identify CF from a single cell or even a single chloroplast...
2017: Plant Methods
https://www.readbyqxmd.com/read/28539971/a-fast-efficient-chromatin-immunoprecipitation-method-for-studying-protein-dna-binding-in-arabidopsis-mesophyll-protoplasts
#10
Jeong Hwan Lee, Suhyun Jin, Sun Young Kim, Wanhui Kim, Ji Hoon Ahn
BACKGROUND: Binding of transcription factors to their target sequences is a primary step in the regulation of gene expression and largely determines gene regulatory networks. Chromatin immunoprecipitation (ChIP) is an indispensable tool used to investigate the binding of DNA-binding proteins (e.g., transcription factors) to their target sequences in vivo. ChIP assays require specific antibodies that recognize endogenous target transcription factors; however, in most cases, such specific antibodies are unavailable...
2017: Plant Methods
https://www.readbyqxmd.com/read/28539970/developing-transgenic-wheat-to-encounter-rusts-and-powdery-mildew-by-overexpressing-barley-chi26-gene-for-fungal-resistance
#11
Hala F Eissa, Sameh E Hassanien, Ahmed M Ramadan, Moustafa M El-Shamy, Osama M Saleh, Ahmed M Shokry, Mohamed Abdelsattar, Yasser B Morsy, Maher A El-Maghraby, Hussien F Alameldin, Sabah M Hassan, Gamal H Osman, Hesham T Mahfouz, Gharib A Gad El-Karim, Magdy A Madkour, Ahmed Bahieldin
BACKGROUND: The main aim of this study was to improve fungal resistance in bread wheat via transgenesis. Transgenic wheat plants harboring barley chitinase (chi26) gene, driven by maize ubi promoter, were obtained using biolistic bombardment, whereas the herbicide resistance gene, bar, driven by the CaMV 35S promoter was used as a selectable marker. RESULTS: Molecular analysis confirmed the integration, copy number, and the level of expression of the chi26 gene in four independent transgenic events...
2017: Plant Methods
https://www.readbyqxmd.com/read/28533812/visualization-of-zinc-dynamics-in-intact-plants-using-positron-imaging-of-commercially-available-65-zn
#12
Nobuo Suzui, Yong-Gen Yin, Satomi Ishii, Hitoshi Sekimoto, Naoki Kawachi
BACKGROUND: Positron imaging can be used to non-destructively visualize the dynamics of a positron-emitting radionuclide in vivo, and is therefore a tool for understanding the mechanisms of nutrient transport in intact plants. The transport of zinc, which is one of the most important nutrient elements for plants, has so far been visualized by positron imaging using (62)Zn (half-life: 9.2 h), which is manufactured in the limited number of facilities that have a cyclotron. In contrast, the positron-emitting radionuclide (65)Zn (half-life: 244 days) is commercially available worldwide...
2017: Plant Methods
https://www.readbyqxmd.com/read/28529536/mid-infrared-spectroscopy-combined-with-chemometrics-to-detect-sclerotinia-stem-rot-on-oilseed-rape-brassica-napus-l-leaves
#13
Chu Zhang, Xuping Feng, Jian Wang, Fei Liu, Yong He, Weijun Zhou
BACKGROUND: Detection of plant diseases in a fast and simple way is crucial for timely disease control. Conventionally, plant diseases are accurately identified by DNA, RNA or serology based methods which are time consuming, complex and expensive. Mid-infrared spectroscopy is a promising technique that simplifies the detection procedure for the disease. Mid-infrared spectroscopy was used to identify the spectral differences between healthy and infected oilseed rape leaves. Two different sample sets from two experiments were used to explore and validate the feasibility of using mid-infrared spectroscopy in detecting Sclerotinia stem rot (SSR) on oilseed rape leaves...
2017: Plant Methods
https://www.readbyqxmd.com/read/28529535/a-method-to-estimate-plant-density-and-plant-spacing-heterogeneity-application-to-wheat-crops
#14
Shouyang Liu, Fred Baret, Denis Allard, Xiuliang Jin, Bruno Andrieu, Philippe Burger, Matthieu Hemmerlé, Alexis Comar
BACKGROUND: Plant density and its non-uniformity drive the competition among plants as well as with weeds. They need thus to be estimated with small uncertainties accuracy. An optimal sampling method is proposed to estimate the plant density in wheat crops from plant counting and reach a given precision. RESULTS: Three experiments were conducted in 2014 resulting in 14 plots across varied sowing density, cultivars and environmental conditions. The coordinates of the plants along the row were measured over RGB high resolution images taken from the ground level...
2017: Plant Methods
https://www.readbyqxmd.com/read/28523073/improved-axenic-hydroponic-whole-plant-propagation-for-rapid-production-of-roots-as-transformation-target-tissue
#15
Kyle Benzle, Katrina Cornish
BACKGROUND: Plant roots are used as an efficient target tissue for plant transformation assays. In root propagable species transformed roots are able to regenerate into whole plants without the addition of exogenous hormones, thus avoiding somaclonal variation associated with many plant transformation protocols. Plants grown in soil or soilless solid medium have roots that tend to be extremely delicate and are difficult to sterilize in advance of plant transformation experiments. Axenic tissue culture plants grown on semi-solid media are slow to produce large amounts of biomass compared to plants grown in solution-based media...
2017: Plant Methods
https://www.readbyqxmd.com/read/28515773/building-a-multipurpose-insertional-mutant-library-for-forward-and-reverse-genetics-in-chlamydomonas
#16
Xi Cheng, Gai Liu, Wenting Ke, Lijuan Zhao, Bo Lv, Xiaocui Ma, Nannan Xu, Xiaoling Xia, Xuan Deng, Chunlei Zheng, Kaiyao Huang
BACKGROUND: The unicellular green alga, Chlamydomonas reinhardtii, is a classic model for studying flagella and biofuel. However, precise gene editing, such as Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) and CRISPR-associated protein (Cas9) system, is not widely used in this organism. Screening of random insertional mutant libraries by polymerase chain reaction provides an alternate strategy to obtain null mutants of individual gene. But building, screening, and maintaining such a library was time-consuming and expensive...
2017: Plant Methods
https://www.readbyqxmd.com/read/28491122/in-situ-measurement-of-scots-pine-needle-pri
#17
Matti Mõttus, Rocío Hernández-Clemente, Viljami Perheentupa, Vincent Markiet
BACKGROUND: The Photochemical Reflectance Index (PRI) calculated from narrow-band spectral reflectance data is a vegetation index which is increasingly used as an indicator of photosynthetic activity. The leaf-level link between the status of photosynthetic apparatus and PRI has been robustly established under controlled light conditions. However, when a whole canopy is measured instantaneously, the PRI signal is heavily modified by vegetation structure and local variations in incident light conditions...
2017: Plant Methods
https://www.readbyqxmd.com/read/28491121/development-of-a-new-heat-tolerance-assay-system-for-rice-spikelet-sterility
#18
Makoto Hakata, Hiroshi Wada, Chisato Masumoto-Kubo, Ryo Tanaka, Hiroyuki Sato, Satoshi Morita
BACKGROUND: Reduction in rice yield caused by high temperature-induced spikelet sterility has been a serious concern in rice production. To date, several screening methods have been used, although their reproducibility is sometimes poor due to artifacts mainly caused by varietal differences in heading dates and panicle heights (i.e., the distance from the lamps). METHODS: We have developed a novel assay system for heat-induced spikelet sterility by using artificial rice paddies in phytotrons to conduct a highly reproducible assay throughout a year...
2017: Plant Methods
https://www.readbyqxmd.com/read/28491120/microscopy-of-physcomitrella-patens-sperm-cells
#19
Nelly A Horst, Ralf Reski
BACKGROUND: Archegoniates (bryophytes, ferns and gymnosperms), such as the moss Physcomitrella patens, possess freely motile sperm cells (spermatozoids) which reach the egg cell via surface water. Although these motile flagellated sperm cells are a traditional botanical subject, they have not been thoroughly analysed in the flagship non-seed plant model species P. patens. Protocols are required to determine the behaviour of wild type sperms as a prerequisite for future research such as the characterization of mutants or factors that influence sperm number, morphology, viability and motility...
2017: Plant Methods
https://www.readbyqxmd.com/read/28465712/a-novel-hairpin-library-based-approach-to-identify-nbs-lrr-genes-required-for-effector-triggered-hypersensitive-response-in-nicotiana-benthamiana
#20
Cyril Brendolise, Mirco Montefiori, Romain Dinis, Nemo Peeters, Roy D Storey, Erik H Rikkerink
BACKGROUND: PTI and ETI are the two major defence mechanisms in plants. ETI is triggered by the detection of pathogen effectors, or their activity, in the plant cell and most of the time involves internal receptors known as resistance (R) genes. An increasing number of R genes responsible for recognition of specific effectors have been characterised over the years; however, methods to identify R genes are often challenging and cannot always be translated to crop plants. RESULTS: We present a novel method to identify R genes responsible for the recognition of specific effectors that trigger a hypersensitive response (HR) in Nicotiana benthamiana...
2017: Plant Methods
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