Black pepper belongs to piperaceae family and is known as “king of species”. This piperaceae family contain approximately 2,000 species. Phosphorus is one of the most important micronutrients and they are essential for the biological growth, development of plants and it is the most essential nutrient for plants.
Phosphate deficiency is wide spread and phosphate fertilizers universally required in the form of inorganic P fertilizers, only a small portion is utilized by plants and the remaining are in insoluble form and they are solubilised by the microbes present in the soil. Soil, they are rich in micro and macronutrients and sixteen elements or nutrients are essential for plant growth and reproduction. Several soil bacteria, particularly belonging to the genera Pseudomonas and Bacillus posses ability to bring insoluble soil phosphate into soluble forms by secreting acids like formic, lactic and acetic. The rhizosphere soil sample were serially diluted up to 10-4 using sterile distilled water and plated on Pikovskaya’s agar medium by pour plate method. The P solubilising isolates was evaluated on agar plates of Pikovaskya growth medium by solubilising the tricalcium phosphate of the medium.
After incubation the phosphate solubilising microorganisms were selected based on different colonies. Out of so many bacterial isolates, 8 isolates were selected for the further study to perform qualitative and quantitative analysis. Phosphate solubilising microorganisms are possible to use as bio fertilizer for all crops. Among the isolates some of are almost identical in biochemical test but they have different morphology characters.
Table of contents
1. Introduction
1.1 Objectives
1.2 Scope of the study
1.3 Taxonomical classification
2. Review of literature
3. Hypothesis
4. Materials and Methods
4.1 Study area
4.2 Sample collection and processing
4.3 Isolation of phosphate solubilisation bacteria
4.4 Screening of isolates for PSE (plate assay method)
4.5 Identification of phosphate solubilisation bacteria
4.6 Antimicrobial assay
4.7 Soil analysis
4.8 Statistical analysis
5. Results and discussion
5.1 Isolation and population dynamics of PSB
5.2 Morphological and biochemical characteristics
6. Conclusions
Research Objectives and Topics
The primary objective of this study is to isolate and characterize phosphate-solubilizing bacteria (PSB) from the rhizosphere soil of various black pepper (Piper nigrum) varieties in Kerala, India, and to evaluate their potential as biofertilizers through detailed microbial and soil analysis.
- Microbial isolation and identification from black pepper rhizosphere
- Qualitative and quantitative analysis of phosphate solubilization efficiency
- Biochemical and morphological characterization of bacterial isolates
- Antimicrobial susceptibility testing of isolated PSB
- Comprehensive soil physicochemical analysis to determine fertility markers
Excerpt from the Book
4.2 Sample collection and processing
Various pepper varieties in Kerala were selected based on a baseline survey, information’s collected from various beneficiaries and databases. Two different pepper varieties were selected across Kerala for soil analysis and bacterial isolation. The soil samples (Four samples) were collected from the fields of Piper nigrum rhizosphere from various district of Kerala, India (Figure 2) during the month of December 2016. Samples were collected from the selected sites at a depth of 15 cm from 6 different points within the area. The samples were transported to the laboratory until processing. The samples were dried in hot air oven at 40°C for 48 hrs. The samples were pooled based on locations and were finely powered using a agate pestle and mortar; later stored in airtight polyethylene tubes till analysis. Locations of the sample collection points were recorded using a Trimble Geoexplorer II (Trimble Navigation Ltd, Sunnyvale, California) and data were transferred using GPS Pathfinder Office software (Trimble Navigation Ltd, Sunnyvale, California).
Summary of Chapters
1. Introduction: Provides an overview of the botanical and economic significance of black pepper, emphasizing the role of rhizosphere bacteria in phosphorus solubilization and plant health.
2. Review of literature: Summarizes existing knowledge regarding black pepper cultivation, essential soil nutrients, and the mechanisms by which microorganisms enhance phosphate availability.
3. Hypothesis: Outlines the research assumptions, focusing on the influence of pepper varieties on rhizospheric microbial populations and soil chemical structures.
4. Materials and Methods: Details the systematic procedures for soil collection, bacterial isolation, biochemical characterization, and the analysis of soil physicochemical properties.
5. Results and discussion: Presents the findings regarding the population dynamics, morphological characteristics, and biochemical testing of the bacterial isolates, along with soil analysis data.
6. Conclusions: Synthesizes the study results, confirming the potential of specific bacterial isolates to serve as effective, eco-friendly biofertilizers for agricultural development.
Keywords
Rhizosphere, Phosphate solubilizing bacteria, Black pepper, Piper nigrum, Biofertilizer, Pikovskaya agar, Kerala, Microbial isolation, Soil fertility, Phosphorus, Biochemical characterization, Antimicrobial assay, Plant growth promoting rhizobacteria.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on isolating and characterizing phosphate-solubilizing bacteria (PSB) present in the rhizosphere of black pepper to understand their potential use as biofertilizers in agriculture.
What are the primary thematic areas covered?
The study covers microbial diversity in the rhizosphere, the biochemical mechanisms of phosphate solubilization, soil nutrient analysis, and the plant growth-promoting traits of specific bacterial isolates.
What is the main research question or objective?
The primary objective is to investigate whether bacteria isolated from different black pepper varieties can effectively solubilize insoluble phosphate, thereby serving as a sustainable alternative to chemical fertilizers.
Which scientific methods were employed?
The study utilized standard microbiological techniques including serial dilution, plating on Pikovskaya agar, Gram staining, IMViC tests, carbohydrate fermentation, and antibiotic disc diffusion, alongside soil physicochemical analysis.
What does the main body of the work cover?
The main body covers the systematic methodology for isolating bacteria, performing biochemical profiles (such as catalase and citrate tests), and conducting detailed soil health assessments across various geographical collection points.
Which keywords characterize this work?
Key terms include rhizosphere, phosphate solubilizing bacteria, Piper nigrum, biofertilizers, soil nutrient management, and bacterial identification.
How does soil texture influence the isolated bacteria?
The research indicates that soil composition varies across locations, which impacts the population and characteristics of the phosphate-solubilizing microbes found within the rhizosphere.
What significance do the Gram staining results hold for the isolates?
Gram staining was used to differentiate the morphological types of the isolates; the results showed that seven of the eight tested bacterial strains were Gram-positive, aiding in their preliminary identification.
- Arbeit zitieren
- Dr. Prem Jose Vazhacharickal (Autor:in), Sajeshkumar N.K. (Autor:in), Jiby John Mathew (Autor:in), Mili Rose Michel (Autor:in), 2017, Isolation of phosphate solubilsing bacteria from rhizosphere of different black pepper (Piper nigrum) varieties in Kerala, München, GRIN Verlag, https://www.grin.com/document/370222
