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Papers by faryad khan

Nanomaterials

This review tries to summarize the purpose of steadily developing surface-functionalized nanopart... more This review tries to summarize the purpose of steadily developing surface-functionalized nanoparticles for various bio-applications and represents a fascinating and rapidly growing field of research. Due to their unique properties—such as novel optical, biodegradable, low-toxicity, biocompatibility, size, and highly catalytic features—these materials are considered superior, and it is thus vital to study these systems in a realistic and meaningful way. However, rapid aggregation, oxidation, and other problems are encountered with functionalized nanoparticles, inhibiting their subsequent utilization. Adequate surface modification of nanoparticles with organic and inorganic compounds results in improved physicochemical properties which can overcome these barriers. This review investigates and discusses the iron oxide nanoparticles, gold nanoparticles, platinum nanoparticles, silver nanoparticles, and silica-coated nanoparticles and how their unique properties after fabrication allow f...

Nanomaterials, 2022

The key pathways for synthesizing nanoparticles are physical and chemical, usually expensive and ... more The key pathways for synthesizing nanoparticles are physical and chemical, usually expensive and possibly hazardous to the environment. In the recent past, the evaluation of green chemistry or biological techniques for synthesizing metal nanoparticles from plant extracts has drawn the attention of many researchers. The literature on the green production of nanoparticles using various metals (i.e., gold, silver, zinc, titanium and palladium) and plant extracts is discussed in this study. The generalized mechanism of nanoparticle synthesis involves reduction, stabilization, nucleation, aggregation and capping, followed by characterization. During biosynthesis, major difficulties often faced in maintaining the structure, size and yield of particles can be solved by monitoring the development parameters such as temperature, pH and reaction period. To establish a widely accepted approach, researchers must first explore the actual process underlying the plant-assisted synthesis of a metal...

Indian Phytopathology, 2018

Journal of Plant Protection Research, 2017

Journal of Agriculture and Crops, 2018

A pot experiment was conducted to evaluate the nematicidal efficacy of a biocontrol agent, Pseudo... more A pot experiment was conducted to evaluate the nematicidal efficacy of a biocontrol agent, Pseudomonas flourescens for the management of root-knot nematode, Meloidogyneincognita on chickpea (Cicer arietinum L.) cv.'Avarodhi' under glasshouse conditions. All the treatments were found to significantly improve the growth and physiological parameters of chickpea and reduction in pathological parameters as compare to untreated inoculated control. The highest improvement was observed in those plants treated with P. flourescens alone. Concomitant and sequential inoculation of P. flourescens with M.incognita also showed significant improvement in growth parameters of chickpea. Least enhancement in growth parameters was observed in those plants inoculated with nematode alone. It may be due to the nematcidal behaviour of P. flourescens against root-knot nematode, M. incognita. Hence, it may be concluded that P. flourescens as biocontrol agent is better substitute against chemical nematicides for the sustainable management of M. incognita and reduce environmental hazards.

Microorganisms

This investigation presents a novel finding showing the effect of culture filtrates (CFs) of macr... more This investigation presents a novel finding showing the effect of culture filtrates (CFs) of macrofungi, Ganoderma lucidum, against Meloidogyne incognita evaluated in vitro and in planta. To determine the nematicidal activity, juveniles of M. incognita were exposed to Ganoderma CFs of three different ages (Two, four and eight weeks old) of pileus and stipe at different concentrations, i.e., 100%, 50%, 10% and 1% for different time intervals (12, 24, 48 and 72 h). Ganoderma species were examined morphologically based on external appearance and analytically using SEM. The ethanolic samples of basidiocarp were prepared and analyzed for in vitro nematicidal assay and different bioactive compounds. The in vitro experiment results revealed that among all three ages of pileus and stipe, two-week-old pileus and stipe exhibited great nematotoxic potency and caused 83.8% and 73.8% juveniles’ mortality at 100% concentration after 72 h of exposure time, respectively. Similarly, the two-week-old...

Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2021

Root-knot nematode, Meloidogyne incognita (Kofoid and White) is one of most damaging pathogen of ... more Root-knot nematode, Meloidogyne incognita (Kofoid and White) is one of most damaging pathogen of vegetables, including carrot (Daucus carota L.). We evaluated nematicidal potential of chitosan in combination with chopped leaves of Argemone mexicana L., Achyranthes aspera L., and Ricinus communis L. against infestation caused by M. incognita on carrot under both in vitro and in vivo. Infectious stage (J2s) and egg masses of M. incognita were exposed to different concentrations (2500, 2000, 1500, 1000, and 500 ppm) of chitosan and botanical extracts separately. Maximum mortality of J2s and the highest inhibition in egg hatching was observed at 2500 ppm of chitosan after 36 h and days incubation period, respectively and minimum found in 500 ppm of A. aspera after 12 h of incubation period. Furthermore, pots treated with 1 g chitosan and 30 g of freshly chopped leaves of all three tested botanicals significantly reduced pathological parameters and improved growth and photosynthetic attr...

Indian phytopathology, 2021

Induced resistance techniques for plant disease management are one of the robust and constructive... more Induced resistance techniques for plant disease management are one of the robust and constructive approaches against plant pests. The present study conducted to trigger the plant-mediated resistance in tomato cv. “K-21” against Meloidogyne incognita by the involvement of dl-β aminobutyric acid (BABA) under salt stress conditions. Results indicate that seedlings elicitors (dl-β aminobutyric acid) strongly suppressed multiplication of nematode population. At the same time, we could not observe this effect in an inoculated control. Additionally, treated tomato roots with BABA and BABA, coupled with NaCl, showed significant improvement in growth parameters and phenolic compounds. Application of BABA (1.21 mM) + NaCl (100 mM) in combination significantly reduced the root-knot index by 48%. Whereas the same combination significantly improved the phenolic compounds and dry weight content up to 75% and 64% respectively. The minute amount of BABA, in combination with salt stress, resulted in...

Plants, 2021

This study was conducted on tomato (Solanum lycopersicum cv. K-21) to investigate the bioprotecti... more This study was conducted on tomato (Solanum lycopersicum cv. K-21) to investigate the bioprotective nature of Pseudomonas fluorescens and its interactive effects with Meloidogyne incognita in terms of growth biomarkers, changes in biochemical attributes and modulation in antioxidant enzymes of the tomato plant. In this study, we grew tomato plants with M. incognita and P. fluorescens in separate pots, simultaneously and sequentially (15 days prior or post) after 15 days of seed sowing. The sequential inoculation of Mi15→Pf maximally increased the root-knot index and decreased the nematode population. It was also noted that inoculation suppressed the plant growth biomarkers in comparison to control. However, maximum suppression in nematode reproduction and increment in growth and physiological attributes were observed when P. fluorescens was applied 15 days prior to the nematode (Pf15→Mi) as compared to control. All the treatments showed an increase in antioxidant enzymes. Expression...

Innovative Approaches in Diagnosis and Management of Crop Diseases, 2021

Biochar, a solid by product of thermal decomposition of organic matter in oxygen deficient enviro... more Biochar, a solid by product of thermal decomposition of organic matter in oxygen deficient environment, has gained international attention and interest among the growers as soil amendment in agriculture for the sustainable management of nematode disease. This review mainly focuses on the potential role of biochar as soil conditioner and nematode disease management. However, currently due to the very limited known information regarding the mechanism involved against the nematode disease, agronomic characters and soil health benefits is not properly understood. Biochar act as a positive effectors and promoter of growth productivity and reduction in the suppression of nematode disease. Soil organic amendment on decomposition release different organic acids and toxic chemic compounds having biocidal activity which might results in the suppression of nematode reproduction and thereby results in the reduction of the nematode infestation. Beside this biochar shows various positive effect i...

Salt Stress, Microbes, and Plant Interactions: Causes and Solution

Salinity is one of the most prominent environmental stress found in the cultivated crops worldwid... more Salinity is one of the most prominent environmental stress found in the cultivated crops worldwide because many of the crops are susceptible to soil salinization resulting from the accumulation of salts in the soil. Salinity alters the physiology and metabolism of plants by a decrease in the rate of photosynthesis, respiration, protein synthesis, and lipid metabolism that lead to a reduction in yield of many crops. To overcome this problem, plants grown in saline conditions are engineered with plant growth-promoting rhizobacteria (PGPR agriculturally important bacteria) that inhabited in the rhizosphere of the plant. Globally, about 20% of cultivable land, as well as 50% of cropland, is under salinity stress according to the United Nations Environment Programme (UNEP). The beneficial effects of PGPR in alleviating salt stress involve boosting key physiological and biochemical pathways, viz., water and nutrient uptake, photosynthetic machinery, ion homeostasis, regulation of osmotic balance, regulation of redox status, capacity, regulation of endogenous phytohormone level, and availability of volatile organic compounds for plants. Therefore, it is recommended that the application of PGPR is an effective means to combat salinity stress in agricultural fields, thereby enhancing world crop productivity. The main emphasis of the chapter is to evaluate the salinity tolerance mechanisms exhibited by PGPR.

Environmental Sustainability

Meloidogyne incognita is one of the prime restricting factors of yield in crops. Approaches to di... more Meloidogyne incognita is one of the prime restricting factors of yield in crops. Approaches to diminish the populations are consistently raised, and the application of elicitors as resistance inducers is an option for managing the disease. Thus, this study was conducted to examine the potential of acibenzolar-S-methyl (ASM), a chemical activator, as a soil drench to induce resistance against M. incognita infestation with and without salt stress. Results demonstrated that alone and under salt stress, ASM was able to reduce root-knot nematode population in tomato. The applied treatments significantly reduced the root-knot nematode reproduction, increased growth and phenolic compounds in the plants. Treatment of ASM (0.254 mM) with NaCl (100 mM), significantly reduced the root-knot index by 58.0% compared to untreated control. The same combination significantly enhanced the phenolic compounds and dry matter up to 60.6% and 59.0%, respectively, compared to inoculated control. However, the application of the highest concentration of ASM (1.019 mM) alone was the most potent in reducing the eggmasses and root-knot index by 74.4% and 68.0% respectively compared to inoculated control. Additionally, the lowest increase (23.0%) of phenol was observed in ASM (0.509 mM). NaCl alone also reduced the root-knot index by 32.0% and increased phenol accumulation by 47.5%. Moreover, lower concentration of ASM (0.254 mM) in combination with salt stress (NaCl 100 mM) showed significantly higher efficacy. The study revealed that application of ASM through stress modulation effect can activate the inherent M. incognita resistance in tomato, which could contribute substantially in sustainable management of nematode infestation.

Acta Agriculturae Scandinavica, Section B — Soil & Plant Science

ABSTRACT This review deals with the mechanism of antagonistic action of bacterial and fungal bioc... more ABSTRACT This review deals with the mechanism of antagonistic action of bacterial and fungal biocontrol agents such as the production of antibiotics, siderophores, enzyme secretion, competition for nutrition, plant growth promotion by rhizosphere microorganism. The utilisation of synthetic pesticides has been the predominant control processor for diseases brought about by phytopathogenic microorganisms. Notwithstanding, their open and improper application in intensive agriculture has realised issues that have prompted ecological contamination, considerable residues in agricultural products and phytopathogen resistance. They are likewise disrupting the quantity of beneficial microorganism which is available in the soil and capable of expanding soil fertility. Along these lines, there is a need to look through the option of synthetic pesticides that are safe, environmental and monetarily feasible to confront this problem. Biocontrol agent’s utilisation is the best alternative method to control the different kinds of diseases, such as nematode infestation, fungal pathogen and bacterial pathogen. Nowadays, biocontrol agents assume a significant role in the field of agriculture. It is a financially savvy, environment-friendly and inhibits the advancement of pathogenic microorganism sustainably. This review emphasises the role of biocontrol agents against different pathogenic microorganisms and their significance potentiality to improve plant growth and enhance defence system of plants.

Indian Phytopathology

Soil amendment with biochar is widely used to improve soil fertility and crop productivity. Howev... more Soil amendment with biochar is widely used to improve soil fertility and crop productivity. However, its effect on plant nematodes has not been examined properly. The present study investigates the effects of biochar on root knot nematode, Meloidogyne incognita under in planta conditions. In pots experiment, biochar (45 g) when paired with oil cakes (15 g) suppressed the M. incognita and improved the plant growth of tested plant. Significant suppression in nematode infestation in terms of egg masses and eggs by (56.0 and 52.7%) and maximum improvement in plant growth in plant length and dry weight by 74.1 and 63.8%, respectively was observed when combined soil application of biochar and mustard cake was applied in the soil. The effect was least when biochar was applied alone. The study has suggested that biochar amendment along with mustard oil cake can control root knot nematode infestation in lentil.

Current Plant Biology

Abstract In this study effort was made to manage the root-knot nematode, Meloidogyne incognita by... more Abstract In this study effort was made to manage the root-knot nematode, Meloidogyne incognita by the utilization of selected plants such as Coccinia grandis, Commelina benghalensis, Leucas cephalotes, Phyllanthus amarus and Trianthema portulacastrum. During the in vitro experiment, the second juveniles (J2s) of M. incognita directly treated with aqueous extracts of the plant leaves at 1000, 2000, 3000, 4000 and 5000 ppm concentrations. As a result, the 5000 ppm concentration was found most toxic against the survival of second stage juveniles of M. incognita compared to other concentrations. Maximum mortality of 91% was observed in 5000 ppm extract of P. amarus after 72 h of exposure with LC50 value 2084.49 ppm while minimum mortality of 6.2% was found in 1000 ppm extract of T. portulacastrum after 24 h with LC50 value 9484.18 ppm. The percent mortality of juveniles calculated the LC50 values of all the treatments after 24, 48 and 72 h. Similarly, the in vitro tests showed a gradual decrease in the rate of egg hatching of M. incognita with the increasing concentrations of aqueous leaves extracts of plants, i.e., 1000 ppm to 5000 ppm and exposure period. Maximum inhibition in egg hatching was found at 5000 ppm (86.5%) after seven days in the extract of P. amarus while least was observed in T. portulacastrum at 1000 ppm (10.6%). The findings indicate that the plant extracts were found lethal to J2s and also inhibit egg hatching. In pots under greenhouse conditions, the plants treated with both the doses (50 and 100 g/pot) of fresh chopped leaves of the selected botanicals significantly experienced the reduced infestations in relation to root gall index, egg masses/root system and nematode population/250 g soil. The P. amarus treated at 100 gm / pot showed highest nematicidal efficacy with the maximum reductions in all the pathological parameters as compared to the untreated uninoculated control simultaneously resulted in maximum increase of growth and physiological parameters of carrot such as shoot and root lengths, shoot and root fresh weights, shoot and root dry weights, chlorophyll and carotenoid contents and nitrate reductase activity (NRA). The information derived from this study suggests that the leaves of P. amarus plant can be used for the management of M. incognita and could be a possible replacement for synthetic nematicides.

The present investigation was carried out to evaluate the potential of chitosan alone and in comb... more The present investigation was carried out to evaluate the potential of chitosan alone and in combination with various agricultural wastes for the management of root-knot nematode, Meloidogyne incognita on eggplant cv. 'BR-112' under greenhouse conditions. The results showed that chitosan as a single or joint treatment with agricultural wastes significantly (p ≤ 0.05) reduced root-knot indices, and the nematode population in soil. As a result, of this, the growth and growth yielding attributes of eggplant were remarkably augmented. Chitosan as an elicitor induced plant mediated systemic resistance against M. incognita in eggplant. The results of the study demonstrated that maximum reduction in eggmass/root, eggs/eggmasses, nematode population and root-knot indices, was acquired by the treatments: chitosan + onion and chitosan + mentha. It was followed by chitosan + Brassica, chitosan + urad and chitosan + coconut whereas, chitosan combined with corn cob waste was found to be the least effective when compared to the control. The application of chitosan alone was effective but not very satisfactory. Compared to the control applications of all the treatments significantly increased plant growth in terms of length, fresh and dry weights, pollen fertility, yield and biochemical parameters such as chlorophyll, carotenoid content and antioxidant enzymes. This may have been due to the eliciting activity of chitosan, causing systemic resistance in the plant and the release of various toxic chemical compounds during decomposition which have lethal effects against the second stage juveniles of M. incognita and nematode multiplication.