scispace - formally typeset
Search or ask a question
Author

Ahmad Nezami

Bio: Ahmad Nezami is an academic researcher from Ferdowsi University of Mashhad. The author has contributed to research in topics: Salinity & Cultivar. The author has an hindex of 9, co-authored 81 publications receiving 285 citations.
Topics: Salinity, Cultivar, Irrigation, Sowing, Biology


Papers
More filters
Journal ArticleDOI
TL;DR: Results indicated that, seed yield decreased due to deficit irrigation; RWC, SC and leaf greenness were lower under MDS and SDS conditions; whereas deficit irrigation had not equal effects on WUE, WP and RUE of the tested genotypes.

39 citations

Journal ArticleDOI
TL;DR: In this article, the authors used fuzzy inference system (FIS) and weighted linear combination (WLC) for determining parameters weight for agro-ecological zoning of chickpea in semi-arid regions of Iran that includes climatic, topography, soil, and land use parameters.

34 citations

Journal ArticleDOI
TL;DR: In this article, a controlled greenhouse experiment was conducted to study growth performance, petroleum tolerance and total petroleum hydrocarbons (TPHs) removal potency of vetiver and hydrocarbon-degrading bacteria over a period of 120 days in contaminated soils with various oil concentrations.

29 citations

Journal ArticleDOI
TL;DR: In this article, the authors used a hole-plate diffusion method to identify and isolate some native and active oil-degrading bacteria to be used in remediation of contaminated sites.
Abstract: Oil pollution is a major global environmental concern. Bioremediation is considered as a suitable approach for remediation of oil-contaminated environments. In this study, two crude oil-contaminated soils were collected to isolate and identify some native and active oil-degrading bacteria to be used in remediation of contaminated sites. Five isolates were selected according to “hole-plate diffusion method” and were grown in crude oil. They were cultured in a mineral salt medium in which crude oil was employed as the sole carbon source. Biochemical, morphological and genomic identifications demonstrated the bacteria species as Pseudomonas resinovorans, Plantibacter auratus, Bacillus subtilis, Staphylococcus pasteuri and Bacillus atrophaeus. These bacteria were able to degrade 86.0%, 61.3%, 81.1%, 55.0% and 76.2% of aliphatic compounds and 58.6%, 39.4%, 55.5%, 39.0% and 49.9% of aromatic hydrocarbons in a medium containing crude oil (1% v/v) over 21 days, respectively. The degradation rates of aromatic compounds from 14 to 21 days were higher than of aliphatic hydrocarbons. This rate was 28.4% by Bacillus subtilis, 30.9% by Bacillus atrophaeus, 27.2% by Staphylococcus pasteuri and 21.3% by Pseudomonas resinovorans. In Plantibacter auratus, this rate was 16.19% which is less than aliphatic hydrocarbons. To our knowledge, it seems this is the first time to report Pseudomonas resinovorans and Plantibacter auratus as crude oil degraders. Results of this study indicated that the isolated bacteria could have a high potential to be used in bioremediation of oil-contaminated environments.

26 citations


Cited by
More filters
Journal ArticleDOI
01 Sep 1999-Ecology
TL;DR: A Geographical Perspective on Germination Ecology: Tropical and Subtropical Zones and Biogeographical and Evolutionary Aspects of Seed Dormancy.
Abstract: Introduction. Ecologically Meaningful Germination Studies. Types of Seed Dormancy. Germination Ecology of Seeds with Nondeep Physiological Dormancy. Germination Ecology of Seeds with Morphophysiological Dormancy. Germination Ecology of Seeds with Physical Dormancy. Germination Ecology of Seeds in the Persistent Seed Bank. Causes of Within-Species Variations in Seed Dormancy and Germination Characteristics. A Geographical Perspective on Germination Ecology: Tropical and Subtropical Zones. A Geographical Perspective on Germination Ecology: Temperate and Arctic Zones. Germination Ecology of Plants with Specialized Life Cycles and/or Habitats. Biogeographical and Evolutionary Aspects of Seed Dormancy. Subject Index.

410 citations

Journal ArticleDOI
TL;DR: Immobilization has made the use of microbial lipases accomplish its best performance and hence suitable for several reactions and need to enhance aroma to the immobilization processes and reduce logistical liability on the environment and user.
Abstract: Lipases are very versatile enzymes, and produced the attention of the several industrial processes. Lipase can be achieved from several sources, animal, vegetable, and microbiological. The uses of microbial lipase market is estimated to be USD 425.0 Million in 2018 and it is projected to reach USD 590.2 Million by 2023, growing at a CAGR of 6.8% from 2018. Microbial lipases (EC 3.1.1.3) catalyze the hydrolysis of long chain triglycerides. The microbial origins of lipase enzymes are logically dynamic and proficient also have an extensive range of industrial uses with the manufacturing of altered molecules. The unique lipase (triacylglycerol acyl hydrolase) enzymes catalyzed the hydrolysis, esterification and alcoholysis reactions. Immobilization has made the use of microbial lipases accomplish its best performance and hence suitable for several reactions and need to enhance aroma to the immobilization processes. Immobilized enzymes depend on the immobilization technique and the carrier type. The choice of the carrier concerns usually the biocompatibility, chemical and thermal stability, and insolubility under reaction conditions, capability of easy rejuvenation and reusability, as well as cost proficiency. Bacillus spp., Achromobacter spp., Alcaligenes spp., Arthrobacter spp., Pseudomonos spp., of bacteria and Penicillium spp., Fusarium spp., Aspergillus spp., of fungi are screened large scale for lipase production. Lipases as multipurpose biological catalyst has given a favorable vision in meeting the needs for several industries such as biodiesel, foods and drinks, leather, textile, detergents, pharmaceuticals and medicals. This review represents a discussion on microbial sources of lipases, immobilization methods increased productivity at market profitability and reduce logistical liability on the environment and user.

313 citations

Journal ArticleDOI
TL;DR: Findings in various food crops are highlighted, showing how their seed composition is drastically impacted at various cellular levels due to drought and heat stresses, applied separately, or in combination.
Abstract: Drought (water deficits) and heat (high temperatures) stress are the prime abiotic constraints, under the current and climate change scenario in future. Any further increase in the occurrence, and extremity of these stresses, either individually or in combination, would severely reduce the crop productivity and food security, globally. Although, they obstruct productivity at all crop growth stages, the extent of damage at reproductive phase of crop growth, mainly the seed filling phase, is critical and causes considerable yield losses. Drought and heat stress substantially affect the seed yields by reducing seed size and number, eventually affecting the commercial trait ‘100 seed weight’ and seed quality. Seed filling is influenced by various metabolic processes occurring in the leaves, especially production and translocation of photoassimilates, importing precursors for biosynthesis of seed reserves, minerals and other functional constituents. These processes are highly sensitive to drought and heat, due to involvement of array of diverse enzymes and transporters, located in the leaves and seeds. We highlight here the findings in various food crops showing how their seed composition is drastically impacted at various cellular levels due to drought and heat stresses, applied separately, or in combination. The combined stresses are extremely detrimental for seed yield and its quality, and thus need more attention. Understanding the precise target sites regulating seed filling events in leaves and seeds, and how they are affected by abiotic stresses, is imperative to enhance the seed quality. It is vital to know the physiological, biochemical and genetic mechanisms, which govern the various seed filling events under stress environments, to devise strategies to improve stress tolerance. Converging modern advances in physiology, biochemistry and biotechnology, especially the “omics” technologies might provide a strong impetus to research on this aspect. Such application, along with effective agronomic management system would pave the way in developing crop genotypes/varieties with improved productivity under drought and/or heat stresses.

295 citations

Journal ArticleDOI
TL;DR: This review refines the knowledge involved in Se-mediated improvements of plant growth when subjected to salinity and suggests future perspectives as well as several research limitations in this field.
Abstract: Soil salinization is one of the major environmental stressors hampering the growth and yield of crops all over the world. A wide spectrum of physiological and biochemical alterations of plants are induced by salinity, which causes lowered water potential in the soil solution, ionic disequilibrium, specific ion effects, and a higher accumulation of reactive oxygen species (ROS). For many years, numerous investigations have been made into salinity stresses and attempts to minimize the losses of plant productivity, including the effects of phytohormones, osmoprotectants, antioxidants, polyamines, and trace elements. One of the protectants, selenium (Se), has been found to be effective in improving growth and inducing tolerance against excessive soil salinity. However, the in-depth mechanisms of Se-induced salinity tolerance are still unclear. This review refines the knowledge involved in Se-mediated improvements of plant growth when subjected to salinity and suggests future perspectives as well as several research limitations in this field.

263 citations