Melhora do efeito de estresse salino em morango por adição de ácido salicílico

Strawberry is considered as a salinity sensitive species and is adversely affected in response to the salt stress in terms of growth and yield. Pot experiments were conducted to determine the effect of exogenous salicylic acid (SA) application on physiology, growth, chlorophyll and mineral content of strawberry grown under salt stress and greenhouse conditions. Strawberry plants were treated with SA at different concentrations (0.0, 0.25, 0.50 and 1.00 mM). Salinity treatments were established by adding 0 and 35 mM of NaCl to a base complete nutrient solution. Salt stress negatively affected the growth, chlorophyll content and mineral uptake of strawberry plants. However, plants treated with SA often had greater shoot fresh weight, shoot dry weight, root fresh weight and root dry weight as well as higher chlorophyll content under salt stress. The greatest values were obtained with 1.00 mM SA treatment in both saline and non-saline conditions. Leaf water relative content (LWRC) was reduced in response to salt stress while electrolyte leakage was raised. SA treatments induced increases in LWRC and decreases in electrolyte leakage compared to the control under salt stress. With respect to the nutrient content, SA treatments increased almost contents of all nutrients in leaves and roots of strawberry plants under salt stress. The greatest values were often obtained by the 1.00 mM SA treatment. These findings suggest that the SA treatments can ameliorate the negative effect of salinity on the growth of strawberries.O morango é considerado uma espécie sensível à salinidade e é negativamente afetado por estresse salino, em termos de crescimento e produção. Por meio de experimentos em vaso foi determinado o efeito de ácido salicílico exógeno (SA) na fisiologia, crescimento, conteúdos de clorofila e de minerais, em morangueiros cultivados em estufa sob estresse salino. As concentrações de SA foram 0.0, 0.25, 0.50 e 1.00 mM. O estresse salino foi verificado pela adição de 0 e 35 mM de NaCl à uma solução nutritiva completa. O estresse salino afetou negativamente o crescimento, o conteúdo de clorofila e a absorção dos nutrientes minerais. Entretanto, plantas tratadas com SA muitas vezes apresentam maiores pesos frescos e secos, além de maior concentração de clorofila, sob condições de estresse salino. O conteúdo relativo de água das folhas (LWRC) foi reduzido em resposta ao estresse salino, enquanto o extravasamento de eletrólitos aumentou. Os tratamentos com SA induziram a aumentos em LWRC e diminuições no extravassamento de eletrólitos, em comparação com os controles sob estresse salino. Com respeito aos conteúdos de nutrientes, houve aumento para quase todos os nutrientes com adição de SA nas folhas e raízes sob estresse salino. Os maiores valores forma geralmente obtidos para 1.00 mM SA. Estes resultados sugerem que os tratamentos com SA podem atenuar os efeitos negativos da salinidade no crescimento do morangueiro

Drought stress amelioration in tomato (Solanum lycopersicum L.) seedlings by biostimulant as regenerative agent

Drought adversely affects many physiological and biochemical events of crops. This research was conducted to investigate the possible effects of biostimulants containing plant growth-promoting rhizobacteria (PGPR) on plant growth parameters, chlorophyll content, membrane permeability (MP), leaf relative water content (LRWC), hydrogen peroxide (H2O2), proline, malondialdehyde (MDA), hormone content, and antioxidant enzymes (catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD)) activity of tomato (Solanum lycopersicum L.) seedlings under different irrigation levels. This study was carried out under controlled greenhouse conditions with two irrigation levels (D0: 100% of field capacity and D1: 50% of field capacity) and three biostimulant doses (B0: 0, B1: 4 L ha-1, and B2: 6 L ha-1). The results of the study show that drought stress negatively influenced the growth and physiological characteristics of tomato seedlings while biostimulant applications ameliorated these parameters. Water deficit conditions (50% of field capacity) caused decrease in indole acetic acid (IAA), gibberellic acid (GA), salicylic acid (SA), cytokine, zeatin, and jasmonic acid content of tomato seedlings by ratios of 83%, 93%, 82%, 89%, 50%, and 57%, respectively, and shoot fresh weight, root fresh weight, shoot dry weight, root dry weight, plant height, stem diameter, and leaf area decreased by 43%, 19%, 39%, 29%, 20%, 18%, and 50%, respectively, compared to the control (B0D0). In addition, 21%, 16%, 21%, and 17% reductions occurred in LRWC, chlorophyll a, chlorophyll b, and total chlorophyll contents with drought compared to the control, respectively. Biostimulant applications restored the plant growth, and the most effective dose was 4 L ha-1 under drought condition. Amendment of biostimulant into the soil also enhanced organic matter and the total N, P, Ca, and Cu content of the experiment soil. In conclusion, 4 L ha-1 biostimulant amendment might be a promising approach to mitigate the adverse effects of drought stress on tomato

The Hidden Though Flourishing Justification of Intellectual Property Laws: Distributive Justice, National Versus International Approaches

Bu çalışmada, Gökkuşağı alabalıklarında enfeksiyonoluşturan Ichthyophthirius multifiliis’infarklı bölgelerden izole edilmiş saha suşlarının genotipik yapıları temelindeimmundominant özellik gösteren rekombinant immobilizan antijenlerini(i-antijen) kodlayan genlerin bakteriyel ekspresyon sistemine klonlanarakeksprese ve karakterize edilmeleri, antijenik profillerinin ortaya çıkarılmasıve aşı adayı olabilecek rekombinant antijenlerin elde edilmesi amaçlanmıştır.&nbsp;Çalışmada 2018 ve 2019 yıllarının Temmuz ve Ağustos ayları arasında Gökkuşağıalabalığı yetiştiriciliğinin yoğun yapıldığı Samsun, Rize, Kayseri, Elazığ,Burdur, Antalya ve Muğla illerinde bulunan işletmeler ziyaret edilerek balıkpopülasyonları üzerinde saha araştırmaları yürütülmüş ve I. multifiliis ile enfekte bulunan balıklardan ilgili protokolleregöre izolasyon gerçekleştirilmiştir. Laboratuvara uygun solüsyonlar ve soğukzincir altında intikal ettirilen örneklerden cDNA ve gDNA izolasyonlarıgerçekleştirilmiştir. I. multifiliis i-antijengen lokusunun amplifikasyonu amacıyla optimum primer dizaynı için ön çalışmalaryürütülmüş ve hedef gen bölgeleri uygun amplifikasyon koşullarında PCR’daçoğaltılmıştır. Elde edilen amplikonlar agaroz jel üzerinden saflaştırılmıştır.Multiple gen lokusu sekanslarının belirlenebilmesi amacıyla ilgili pürifiyeamplikonlar pJET 1.2 plazmit vektörüne CloneJET PCR cloning kit (Thermo FisherScientific) kullanılarak klonlanmış ve katı besi yerinde belirlenenkolonilerden rekombinant plazmid DNA izolasyonları gerçekleştirilmiştir. Rekombinantplazmidler spesifik primerlerle çift yönlü olarak sekanslanmış vekromotogramlar De Novo Assemble üzerinden işlenerek hedef insert sekanslarvektör plazmid DNA’sı içerisinden çıkarılmış ve konsensüs sekanslar eldeedilmiştir. İlgili primerlerin i-antijen gen lokusu içerisinde çoğalttığı fragmentlerinbelirlenebilmesi amacıyla PCR ürünleri ayrıca yeni nesil dizileme teknolojisi (NGS)kullanılarak işlenmiş ve elde edilen dizilimlerin gen veri tabanlarındakimevcut tüm i-antijen gen lokusları ile filogenetik ilişkileri araştırılmıştır.Tüm bu araştırmalar sonucu karakterize edilen i-antijen genlerinin ekspreseettiği proteinlerin rekombinant olarak eldesi için çalışmalargerçekleştirilmiştir. Aşı adayı potansiyeli olabilecek bazı lokusların bakteriyelekspresyon sistemine aktarımı için kodon optimizasyonları yapılarak pET-32a(+)ekspresyon plazmid DNA’sına (Novagen) klonlanması gerçekleştirilmiştir. Eldeedilen rekombinant plazmitler E. colikompotent BL21(DE3) hücrelerine transforme edilerek optimum koşullardaekspresyon çalışmaları yürütülmüş ve ekspresyon etkinliği SDS-PAGE ve WesternBlot analizleri ile belirlenmiştir. Eksprese edilen rekombinant i-antijenproteinleri afinite kromotografi kulanılarak saflaştırılmış ve immunreaktiflikleri Western Blot analizleri ile tespit edilmiştir.&nbsp;Çalışmada,Elazığ, Rize ve Muğla illerinde ziyaret edilen işletmelerdeki Gökkuşağıalabalıklarında deri ve solungaçlarından hazırlanan preparatların mikroskobikincelemeleri ile I. multifiliisenfeksiyonunun yaygın olduğu görülmüştür. İlgili bölgelerden elde edilen I. multifiliis suşlarına ait cDNA vegDNA izolatlarının i-antijen gen lokusunun dizayn edilen pirmerlerle PCR’daamplifiye edilmesi sonucu 1200-1300 bp büyüklüğünde amplikonlar saptanmıştır.Pürifiye amplikonların klonlanması sonucu ilgili izolatlara ait açık okumaçerçevesi (ORF) sekanslarının analizinde birbirleriyle %38,3-58,8 arasındafarklılık gösteren 4 farklı i-antijen izoformu tespit edilmiştir. Bu izoformlararasında bir antijenik lokusun (ImulTR1-iant) her üç ildeki alabalıkpopülasyonlarından izole edilen I.multifiliis suşlarında da var olduğu NGS analizlerinde görülmüştür.ImulTR1-iant ORF sekansı ayrıca Amerika Birleşik Devletleri’nde alabalıklardanizole edilmiş bir i-antijen izoformuyla %83,3 identiklik gösterirken, diğertespit edilen izoformlara ait sekansların GenBank veri tabanında mevcuti-antijen sekanslarından oldukça farklı olduğu belirlenmiştir. Araştırmadarekaombinant i-antijen eldesi için yaygın belirlenen ImulTR1-iant izolatıüzerinden analizler yürütülmüştür. Bu izoformu kodlayan gen bölgesinin 1263bpbüyüklüğünde olduğu ve ORF’nin 420 amino asitten teşekkül ettiğibelirlenmiştir. ORF amino asit sekanslarının in-slico analizlerde 42,552 kDabüyüklüğünde bir proteini eksprese ettiği, bu proteinin sitoplazmik olduğu vetransmembran bölge içermediği tespit edilmiştir. Ayrıca ilgili ORF sekansıiçerisinde uzunluğu 7-22aa arasında değişen 21 antijenik bölge olduğubelirlenmiştir. Kodon optimizasyonu yapılmış olan ImulTR1-iant izoformuna ait pET-32a(+)rekombinant plazmitinin E. colikompotent BL21(DE3) hücrelerine transformasyonu ve ekspresyonu sonrasındayapılan SDS-PAGE analizlerinde in-silico analiz sonuçlarına paralel olarakyaklaşık 43kDa’luk protein jel üzerinde görüntülenmiştir. İlgili rekombinantprotein afinite kromotografide HisTrap FF crude (GE Healthcare) kolonlarıkullanılarak saflaştırılmış ve pürifiye rekombinant antijenin immun-reaktifliğiWestern-Blot analizleriyle gösterilmiştir.&nbsp;ErciyesÜniversitesi Bilimsel Araştırma Projeleri Birimi tarafından TOA-2017-7742 kodnumarasıyla desteklenen bu çalışma ile Türkiye’de gökkuşağı alabalıklarındasorun oluşturan ve ekonomik kayıplara yol açan I. multifiliis suşlarına karşı biyoteknolojik aşı geliştirilmesinoktasında aşı adayı olabilecek immobilizan antijenler üzerine özgün veriler sağlanmıştır.Elde edilen aşı adayı rekombinant antijenlerin etkinliğini ortaya koymanoktasında laboratuvar ve saha şartlarında immunizasyon ve çelınç enfeksiyondenemeleri için yeni proje çalışmaları planlanmaktadır.</style

Automated Nanofiber Diameter Measurement in SEM Images Using a Robust Image Analysis Method

Due to the high surface area, porosity, and rigidity, applications of nanofibers and nanosurfaces have developed in recent years. Nanofibers and nanosurfaces are typically produced by electrospinning method. In the production process, determination of average fiber diameter is crucial for quality assessment. Average fiber diameter is determined by manually measuring the diameters of randomly selected fibers on scanning electron microscopy (SEM) images. However, as the number of the images increases, manual fiber diameter determination becomes a tedious and time consuming task as well as being sensitive to human errors. Therefore, an automated fiber diameter measurement system is desired. In the literature, this task is achieved by using image analysis algorithms. Typically, these methods first isolate each fiber in the image and measure the diameter of each isolated fiber. Fiber isolation is an error-prone process. In this study, automated calculation of nanofiber diameter is achieved without fiber isolation using image processing and analysis algorithms. Performance of the proposed method was tested on real data. The effectiveness of the proposed method is shown by comparing automatically and manually measured nanofiber diameter values

How Abiotic Stress Conditions Affects Plant Roots

Roots are generally subject to more abiotic stress than shoots. Therefore, they can be affected by such stresses as much as, or even more, than above ground parts of a plant. However, the effect of abiotic stresses on root structure and development has been significantly less studied than above ground parts of plants due to limited availability for root observations. Roots have functions such as connecting the plant to the environment in which it grows, uptaking water and nutrients and carrying them to the above-ground organs of the plant, secreting certain hormones and organic compounds, and thus ensuring the usefulness of nutrients in the nutrient solution. Roots also send some hormonal signals to the body in stress conditions such as drought, nutrient deficiencies, salinity, to prevent the plant from being damaged, and ensure that the above-ground part takes the necessary precautions to adapt to these adverse conditions. Salinity, drought, radiation, high and low temperatures, heavy metals, flood, and nutrient deficiency are abiotic stress factors and they negatively affect plant growth, productivity and quality. Given the fact that impending climate change increases the frequency, duration, and severity of stress conditions, these negative effects are estimated to increase. This book chapter reviews to show how abiotic stress conditions affect growth, physiological, biochemical and molecular characteristics of plant roots

Principles of Irrigation Management for Vegetables

Vegetables have a very high percentage of water content. Some of the vegetables, such as cucumber, tomato, lettuce, zucchini, and celery contain over ninety-five percent of water. As a result of the high-water content in the cells, they are extremely vulnerable plants to water stress and drought conditions. Their yield and quality are affected rapidly when subjected to drought. Therefore, irrigation is essential to the production of most vegetables in order to have an adequate yield with high quality. However, over-irrigating can inhibit germination and root development, decrease the vegetable quality and post-harvest life of the crop. Determination of suitable irrigation systems and scheduling to apply proper amount of water at the correct time is crucial for achieving the optimum benefits from irrigation. This determination requires understanding of the water demand of the vegetable, soil characteristics, and climate factors. All these factors have major impact for the success and sustainability of any vegetable irrigation. This section contains fundamentals of water requirements on different vegetables and summarizes important issues related to soil, water, and vegetable growth relations together with irrigation management concept by evaluating the challenging issues on the selection of proper irrigation system, suitable irrigation timing, and other parameters to increase vegetable yield in an irrigated agriculture

Peat Use in Horticulture

Peat is a spongy substance which is an effect of incomplete decomposition of plant residues in different stages of decomposition. Between the several organic matters which are used as substrate for horticultural plants cultivation in soilless conditions, peat is the unabandonable ingredient for mixtures for commercial production of plants. Peat is used in horticulture as a component of garden plant substrates, in agriculture for the production of garden soil and as an organic fertilizer, and in balneology as a material for baths and wraps. The use of peat for agriculture and horticulture is determined by the following quality parameters: the degree of decomposition, ash content, pH, the presence of carbonates, the density of the solid phase, bulk density, and porosity. As an organic material, the peat forms in the acidic, waterlogged, and sterile conditions of fens and bogs. The conditions seem like the development of mosses. The plants do not compose as they die. Instead of this, the organic matter is laid down and accumulates in a slow time as peat due to the oxygen deficiency in the bog. This makes peat a highly productive growing medium. In the present novel review, we discuss the peat use in horticulture

Melatonin: Role in Increasing Plant Tolerance in Abiotic Stress Conditions

Nowadays, due to the environmental stress factors that limit the production of crops, it has become very difficult to find suitable areas to enable the plant to reach its optimum product potential. Abiotic stress is very effective in decreasing agricultural production. Factors such as drought, salinity, high and low temperature, flood, radiation, heavy metals, oxidative stress, and nutrient deficiency can be considered as abiotic stress factors, and these sources of stress negatively affect plant growth, quality and productivity. Melatonin (MEL) was first identified in plants in 1995 and is increasingly becoming important for its role and effects in the plant system. MEL has been shown to have a substantial role in plant response to growth, reproduction, development, and different stress factors. In addition to its regulatory role, MEL also plays a protective role against different abiotic stresses such as metal toxicity, temperature, drought, and salinity. In plants, an important role of MEL is to alleviate the effects of abiotic stresses. In this review, the effects of MEL on plant growth, photosynthetic activity, metabolism, physiology, and biochemistry under abiotic stress conditions as a plant growth regulator will be examined

Plant Root Enhancement by Plant Growth Promoting Rhizobacteria

Soil microorganisms perform a variety of functions, some of which are extremely helpful to the maintenance of ecological sustainability. Bacteria thriving in the plant rhizosphere drive plant development through a variety of ways, which are referred to as PGPRs (plant growth-promoting rhizobacteria). Despite the fact that there are many different types of PGPRs, their significance and applications in sustainable agriculture are still debated and limited. The performance of PGPRs vary, which might be related to a variety of environmental conditions that impact their development and proliferation in plants. PGPR is a nonpathogenic, friendly bacterium that stimulates plant development by altering hormone concentrations and nutritional needs, as well as mitigating stress-related damage. PGPRs colonize root hairs and lateral roots in plants, where they may exhibit their beneficial characteristics. Rhizobacteria that promote plant development have the ability to control root system architecture (RSA), as well as the vegetative growth and physiology of the entire plant. The generation of hormones like Indole acetic acid (IAA) by PGPR has long been linked to RSA effects. This book chapter reviews the effects of PGPRs on the growth, the physiological, biochemical, and molecular characteristics of plant roots as well as the mechanisms involved