Mohd Sayeed - Academia.edu (original) (raw)
Papers by Mohd Sayeed
Semina: Ciências Agrárias, 2019
The objective was to verify the antibacterial activity of lemongrass and clove oils against Esche... more The objective was to verify the antibacterial activity of lemongrass and clove oils against Escherichia coli isolated from poultry feces, Staphylococcus aureus isolated from swine and poultry feces and Salmonella sp. isolated from swine and bovine feces. The antimicrobial activity was evaluated by the disc diffusion test using different concentrations of the oils: 160, 80, 40, 20 and 10 ?l ml -1. The multi-resistance of strains relative to that of conventional antimicrobials was also evaluated by the disk diffusion technique, using Multiple Antibiotic Resistance (MAR) index. The oils were characterized based on the results of chromatographic analyses, of which, analysis of lemongrass has been previously published (AZEVEDO et al., 2016). Lemongrass and clove essential oils presented citral and eugenol as the major compound, respectively. The concentrations of the essential oils had a significant effect on the extent of the growth inhibition halo and the coefficient of determination (...
Dalton Transactions, 2015
The immense importance of nanoparticles and growing concerns of environmental impact motivate the... more The immense importance of nanoparticles and growing concerns of environmental impact motivate the exploration of new greener synthetic techniques.
Asian Journal of Chemistry, 2014
The heavy metals released from the industry are the prime source of environmental pollution. It g... more The heavy metals released from the industry are the prime source of environmental pollution. It generally persists in the environment for the longer time and can be accumulated in the soil in different forms which adversely affect the microbial population density and physico-chemical property of soil, and ultimately leads to the loss of crop yields and soil fertility. There are several approaches to remove the heavy metals but the introduction of bioremediation is the most effective tool in this regards concerning environmental issues. Amongst the various microorganisms present in the soil the metal tolerating plant growth promoting bacteria (MT-PGPB) have the capacity to influence the growth and physiology of plants in the metal contaminated soil beside this it also maintained the soil fertility. The use of MT-PGPB provides not only considered as alternative tool for bioremediation of heavy metals from the soil but also minimize demands of agrochemicals. It can also play a signific...
Turkish Journal of Biology
The present study examined the effects of Bacillus pumilus, Pseudomonas alcaligenes,and Rhizobium... more The present study examined the effects of Bacillus pumilus, Pseudomonas alcaligenes,and Rhizobium sp. on wilt disease caused by Fusarium oxysporum f. sp. lentis and on the growth of lentil. Inoculation with F. oxysporum caused significant wilting, and reduced plant growth, the number of pods, and nodulation. Inoculation with B. pumilus together with P. alcaligenes caused a greater increase in plant growth, number of pods, nodulation, and root colonization by rhizobacteria, and also reduced Fusarium wilting to a greater degree than did individual inoculation. Use of Rhizobium sp. resulted in a greater increase in plant growth, number of pods, and nodulation, and reduced wilting more than B. pumilus did. Combined application of B. pumilus and P. alcaligenes with Rhizobium sp. resulted in the greatest increase in plant growth, number of pods, nodulation, and root colonization by rhizobacteria, and also reduced wilting in Fusarium-inoculated plants.
The global biodiversity is changing at an unprecedented rate as a complex response to several hum... more The global biodiversity is changing at an unprecedented rate as a complex response to several human induced changes in the climate. Uses of fertilizers, pesticides and other chemicals have a negative impact soil ecosystem and other issues related to the environment. It can directly or indirectly affect the bulk microbial density, physico-chemical property which is the main cause behind the loss in crop productivity. Thus, it is demand of sustainable agriculture to develop such kind of technologies having eco-friendly approach and also helpful to understand the phenomenon going on below ground level. Integration of mycorrhizal fungi in the agricultural ecosystem can be the energetic loom because they not only improve the plant growth and productivity but also increase soil nutrients, water absorption and also provide the protection against the plant diseases to some extent. The development of microsatellite makers has opened a new era in this field. The technologies based on microsat...
Zinc plays a vital role for various metabolic pathways in plant systems. The plant diseases conce... more Zinc plays a vital role for various metabolic pathways in plant systems. The plant diseases concerned due to its deficiency have also been well addressed. Application of zinc fertilizers can therefore, make a significant contribution towards the goal of higher crop yields. Recently, nanoparticles have received considerable attention due to their increased uptake by plants as they are small in size and have high rate of penetration through plant cell membrane. The present study investigates the effect of zinc oxide nanoparticles (ZnO NPs) on tomato plants with a viewpoint of their potential use as future “nano-fertilizers”. Preliminary studies on seed germination revealed no evidence of toxicity up to 100 mg mL-1 ZnO NPs. Further studies using foliar spray approach were performed to investigate the uptake and penetration of ZnO NPs and to evaluate their effect on growth and biomass production of tomato plants. Pot studies with foliar spray approach showed that plants sprayed with 20 ...
Advanced Science, Engineering and Medicine, 2012
ABSTRACT Sulphur is extremely important to plant growth and soil health. Most agricultural soil c... more ABSTRACT Sulphur is extremely important to plant growth and soil health. Most agricultural soil contains some beneficial microorganisms belongs to genus Thiobacillus. These groups of bacterium play a significant role in the oxidization of sulphur, which might be responsible for the decreases the pH of the soil and solubilize the calcium carbonate in alkaline calcareous soils. Beside this it also makes the soil condition favorable for plant growth, and also helps the plants in nutrient absorption. In addition, Thiobacillus have the ability to reduce the disease severity and also protects the plants from various environmental stresses in the sustainable agricultural system.
Sustainable Agriculture Reviews, 2012
ABSTRACT The poor mobility of soil inorganic phosphorus is due to the large reactivity of phospha... more ABSTRACT The poor mobility of soil inorganic phosphorus is due to the large reactivity of phosphate ions with numerous chemical, mineralogical and biological soil constituents. Adsorption-desorption and precipitation-dissolution equilibria control the concentration of P in the soil solution and P chemical mobility. P bioavailability depends on soil pH, concentrations of anions that compete with P ions for ligand exchange and metals that can coprecipitate with P ions. The mineralization and hydrolysis of organic phosphorus also maintain the phosphorus solution concentration. Thus, only a marginal proportion of soil phosphorus is present as P ions in the soil solution. Due to lack of appropriate methods for studying its speciation and biogeochemical behavior, the mobility of inorganic P in most soils is still poorly understood and hardly predictable. This is even worse when considering the problem of the bioavailability of P to plants. The characterisation and quantification of soil phosphorus and the factors that control the availability of P to plants are of utmost importance to define the bioavailability of soil P. Thus, the measurement of intensity and capacity factors together can describe P supply with considerable precision. Phosphorus flux to the root system is mainly controled by diffusion. Soil water content and diffusion coefficient, including the soil buffer power are key factors in the diffusion of P to plant roots. Root systems have the ability to increase the bioavailable pool of P due to their influence on soil chemistry either directly by the activity of plant roots or indirectly by enhancing the activity of rhizospheric microflora. Phosphorus uptake by roots, effect of soil pH, anion/cation balance, gaseous exchanges and release of root exudates are major rhizosphere processes controling the bioavailability of soil P. Soil P bioavailability can also vary with plant species or genotypes, plant nutritional status and ambient soil conditions. Various extractions procedures are now widely used to assess P bioavailability based on the knowledge of phosphorus dynamics in soils and P mobilization by plants. Furthermore, physiological processes occurring in the rhizosphere also provide a better understanding of P availability. 31P-NMR technique clearly indicates the distribution of inorganic phosphorus in living cell. Kinetics have elucidated the functional characteristics of plasma membrane and tonoplast inorganic phosphate transporters. Molecular studies have confirmed the presence of multiple genes encoding phosphate transporters. Modeling the P bioavailability is a logical approach to understand the complexity of the P nutrition. Though, the authenticity of the models will largely depends on the accuracy and quality of input data that are very subjective to varying soil conditions. Inclusion of bioavailability of P as a parameter in crop modeling will help in solving the large black box of processes and mechanisms of P uptake from soil that has perplexing and hitherto not well understood. The aim of this chapter is to give an overview of P uptake processes and mechanisms involved in plants and the chemical processes that are directly induced by plant roots which can affect the concentration of P in soil solution and, ultimately, the bioavailability of soil phosphorus to plants.
Journal of Nanoparticle Research, 2013
Crop Protection, 2008
... plant diseases. The manipulation of crop rhizosphere by inoculation with Pseudomonas for bioc... more ... plant diseases. The manipulation of crop rhizosphere by inoculation with Pseudomonas for biocontrol of plant pathogens has shown considerable promise (Siddiqui and Mahmood, 1999; Nelson, 2004; Siddiqui, 2006). Similarly ...
Biology and Fertility of Soils, 2006
Comptes Rendus Biologies, 2015
In the present study, 63 polymorphic microsatellite markers related to rice blast resistance gene... more In the present study, 63 polymorphic microsatellite markers related to rice blast resistance genes were fluorescently labelled at the 5'-end with either 6-FAM or HEX using the G5 dye set and incorporated into a multiplex SSR-PCR for the detection of fragments using an automated system. For rice F3 families obtained from crosses between Pongsu Seribu 2 (Malaysian blast resistant cultivar) and Mahsuri (a susceptible rice cultivar), the genotypes for 13 designated multiplex SSR panels were determined. The genotyping assays were performed using a capillary-based ABIPRISM 3100 genetic analyser. The sizes of the SSRs alleles observed in the range from 79 to 324bp. The observed marker segregation data were analysed using the Chi(2) test. A genetic linkage map covering ten chromosomes and comprising 63 polymorphic SSR markers was constructed, and the distorted loci were localised to linkage groups. The results indicated that distorted loci are presented on eight chromosomes.
Frontiers in Plant Science, 2015
Semina: Ciências Agrárias, 2019
The objective was to verify the antibacterial activity of lemongrass and clove oils against Esche... more The objective was to verify the antibacterial activity of lemongrass and clove oils against Escherichia coli isolated from poultry feces, Staphylococcus aureus isolated from swine and poultry feces and Salmonella sp. isolated from swine and bovine feces. The antimicrobial activity was evaluated by the disc diffusion test using different concentrations of the oils: 160, 80, 40, 20 and 10 ?l ml -1. The multi-resistance of strains relative to that of conventional antimicrobials was also evaluated by the disk diffusion technique, using Multiple Antibiotic Resistance (MAR) index. The oils were characterized based on the results of chromatographic analyses, of which, analysis of lemongrass has been previously published (AZEVEDO et al., 2016). Lemongrass and clove essential oils presented citral and eugenol as the major compound, respectively. The concentrations of the essential oils had a significant effect on the extent of the growth inhibition halo and the coefficient of determination (...
Dalton Transactions, 2015
The immense importance of nanoparticles and growing concerns of environmental impact motivate the... more The immense importance of nanoparticles and growing concerns of environmental impact motivate the exploration of new greener synthetic techniques.
Asian Journal of Chemistry, 2014
The heavy metals released from the industry are the prime source of environmental pollution. It g... more The heavy metals released from the industry are the prime source of environmental pollution. It generally persists in the environment for the longer time and can be accumulated in the soil in different forms which adversely affect the microbial population density and physico-chemical property of soil, and ultimately leads to the loss of crop yields and soil fertility. There are several approaches to remove the heavy metals but the introduction of bioremediation is the most effective tool in this regards concerning environmental issues. Amongst the various microorganisms present in the soil the metal tolerating plant growth promoting bacteria (MT-PGPB) have the capacity to influence the growth and physiology of plants in the metal contaminated soil beside this it also maintained the soil fertility. The use of MT-PGPB provides not only considered as alternative tool for bioremediation of heavy metals from the soil but also minimize demands of agrochemicals. It can also play a signific...
Turkish Journal of Biology
The present study examined the effects of Bacillus pumilus, Pseudomonas alcaligenes,and Rhizobium... more The present study examined the effects of Bacillus pumilus, Pseudomonas alcaligenes,and Rhizobium sp. on wilt disease caused by Fusarium oxysporum f. sp. lentis and on the growth of lentil. Inoculation with F. oxysporum caused significant wilting, and reduced plant growth, the number of pods, and nodulation. Inoculation with B. pumilus together with P. alcaligenes caused a greater increase in plant growth, number of pods, nodulation, and root colonization by rhizobacteria, and also reduced Fusarium wilting to a greater degree than did individual inoculation. Use of Rhizobium sp. resulted in a greater increase in plant growth, number of pods, and nodulation, and reduced wilting more than B. pumilus did. Combined application of B. pumilus and P. alcaligenes with Rhizobium sp. resulted in the greatest increase in plant growth, number of pods, nodulation, and root colonization by rhizobacteria, and also reduced wilting in Fusarium-inoculated plants.
The global biodiversity is changing at an unprecedented rate as a complex response to several hum... more The global biodiversity is changing at an unprecedented rate as a complex response to several human induced changes in the climate. Uses of fertilizers, pesticides and other chemicals have a negative impact soil ecosystem and other issues related to the environment. It can directly or indirectly affect the bulk microbial density, physico-chemical property which is the main cause behind the loss in crop productivity. Thus, it is demand of sustainable agriculture to develop such kind of technologies having eco-friendly approach and also helpful to understand the phenomenon going on below ground level. Integration of mycorrhizal fungi in the agricultural ecosystem can be the energetic loom because they not only improve the plant growth and productivity but also increase soil nutrients, water absorption and also provide the protection against the plant diseases to some extent. The development of microsatellite makers has opened a new era in this field. The technologies based on microsat...
Zinc plays a vital role for various metabolic pathways in plant systems. The plant diseases conce... more Zinc plays a vital role for various metabolic pathways in plant systems. The plant diseases concerned due to its deficiency have also been well addressed. Application of zinc fertilizers can therefore, make a significant contribution towards the goal of higher crop yields. Recently, nanoparticles have received considerable attention due to their increased uptake by plants as they are small in size and have high rate of penetration through plant cell membrane. The present study investigates the effect of zinc oxide nanoparticles (ZnO NPs) on tomato plants with a viewpoint of their potential use as future “nano-fertilizers”. Preliminary studies on seed germination revealed no evidence of toxicity up to 100 mg mL-1 ZnO NPs. Further studies using foliar spray approach were performed to investigate the uptake and penetration of ZnO NPs and to evaluate their effect on growth and biomass production of tomato plants. Pot studies with foliar spray approach showed that plants sprayed with 20 ...
Advanced Science, Engineering and Medicine, 2012
ABSTRACT Sulphur is extremely important to plant growth and soil health. Most agricultural soil c... more ABSTRACT Sulphur is extremely important to plant growth and soil health. Most agricultural soil contains some beneficial microorganisms belongs to genus Thiobacillus. These groups of bacterium play a significant role in the oxidization of sulphur, which might be responsible for the decreases the pH of the soil and solubilize the calcium carbonate in alkaline calcareous soils. Beside this it also makes the soil condition favorable for plant growth, and also helps the plants in nutrient absorption. In addition, Thiobacillus have the ability to reduce the disease severity and also protects the plants from various environmental stresses in the sustainable agricultural system.
Sustainable Agriculture Reviews, 2012
ABSTRACT The poor mobility of soil inorganic phosphorus is due to the large reactivity of phospha... more ABSTRACT The poor mobility of soil inorganic phosphorus is due to the large reactivity of phosphate ions with numerous chemical, mineralogical and biological soil constituents. Adsorption-desorption and precipitation-dissolution equilibria control the concentration of P in the soil solution and P chemical mobility. P bioavailability depends on soil pH, concentrations of anions that compete with P ions for ligand exchange and metals that can coprecipitate with P ions. The mineralization and hydrolysis of organic phosphorus also maintain the phosphorus solution concentration. Thus, only a marginal proportion of soil phosphorus is present as P ions in the soil solution. Due to lack of appropriate methods for studying its speciation and biogeochemical behavior, the mobility of inorganic P in most soils is still poorly understood and hardly predictable. This is even worse when considering the problem of the bioavailability of P to plants. The characterisation and quantification of soil phosphorus and the factors that control the availability of P to plants are of utmost importance to define the bioavailability of soil P. Thus, the measurement of intensity and capacity factors together can describe P supply with considerable precision. Phosphorus flux to the root system is mainly controled by diffusion. Soil water content and diffusion coefficient, including the soil buffer power are key factors in the diffusion of P to plant roots. Root systems have the ability to increase the bioavailable pool of P due to their influence on soil chemistry either directly by the activity of plant roots or indirectly by enhancing the activity of rhizospheric microflora. Phosphorus uptake by roots, effect of soil pH, anion/cation balance, gaseous exchanges and release of root exudates are major rhizosphere processes controling the bioavailability of soil P. Soil P bioavailability can also vary with plant species or genotypes, plant nutritional status and ambient soil conditions. Various extractions procedures are now widely used to assess P bioavailability based on the knowledge of phosphorus dynamics in soils and P mobilization by plants. Furthermore, physiological processes occurring in the rhizosphere also provide a better understanding of P availability. 31P-NMR technique clearly indicates the distribution of inorganic phosphorus in living cell. Kinetics have elucidated the functional characteristics of plasma membrane and tonoplast inorganic phosphate transporters. Molecular studies have confirmed the presence of multiple genes encoding phosphate transporters. Modeling the P bioavailability is a logical approach to understand the complexity of the P nutrition. Though, the authenticity of the models will largely depends on the accuracy and quality of input data that are very subjective to varying soil conditions. Inclusion of bioavailability of P as a parameter in crop modeling will help in solving the large black box of processes and mechanisms of P uptake from soil that has perplexing and hitherto not well understood. The aim of this chapter is to give an overview of P uptake processes and mechanisms involved in plants and the chemical processes that are directly induced by plant roots which can affect the concentration of P in soil solution and, ultimately, the bioavailability of soil phosphorus to plants.
Journal of Nanoparticle Research, 2013
Crop Protection, 2008
... plant diseases. The manipulation of crop rhizosphere by inoculation with Pseudomonas for bioc... more ... plant diseases. The manipulation of crop rhizosphere by inoculation with Pseudomonas for biocontrol of plant pathogens has shown considerable promise (Siddiqui and Mahmood, 1999; Nelson, 2004; Siddiqui, 2006). Similarly ...
Biology and Fertility of Soils, 2006
Comptes Rendus Biologies, 2015
In the present study, 63 polymorphic microsatellite markers related to rice blast resistance gene... more In the present study, 63 polymorphic microsatellite markers related to rice blast resistance genes were fluorescently labelled at the 5'-end with either 6-FAM or HEX using the G5 dye set and incorporated into a multiplex SSR-PCR for the detection of fragments using an automated system. For rice F3 families obtained from crosses between Pongsu Seribu 2 (Malaysian blast resistant cultivar) and Mahsuri (a susceptible rice cultivar), the genotypes for 13 designated multiplex SSR panels were determined. The genotyping assays were performed using a capillary-based ABIPRISM 3100 genetic analyser. The sizes of the SSRs alleles observed in the range from 79 to 324bp. The observed marker segregation data were analysed using the Chi(2) test. A genetic linkage map covering ten chromosomes and comprising 63 polymorphic SSR markers was constructed, and the distorted loci were localised to linkage groups. The results indicated that distorted loci are presented on eight chromosomes.
Frontiers in Plant Science, 2015