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Jun 1, 2023 · The tiny bacteria, termed ultramicrobacteria, can be as small as 0.3 mm in diameter with cell volumes less than 0.1 mm 3. Although a variety of cell shapes exists for bacteria, including rod, spherical, spiral, and filamentous, the most common cell shape found in soil is a short rod (coccoid rod).
Sep 30, 2021 · Most examples of microorganisms in soil are decomposers . The decomposer bacteria in soil feed on dead organic matter such as decaying plants and animals. Fungi, such as mushrooms, are another example of a decomposer.
Soil microorganisms can be classified as bacteria, actinomycetes, fungi, algae and protozoa. Each of these groups has characteristics that define them and their functions in soil. [6][7] Up to 10 billion bacterial cells inhabit each gram of soil in and around plant roots, a region known as the rhizosphere.
Morphologically, soil bacteria are divided into three groups, viz., Cocci (round/spherical), rod-shaped (Bacilli), and Spirillum (cells with long wavy chains). Bacillus species dominate the bacterial population in soil and are numerous. They are followed by Cocci and Spirillum species.
Aug 28, 2010 · Free-living soil bacteria beneficial to plant growth, usually referred to as plant growth promoting rhizobacteria (PGPR), are capable of promoting plant growth by colonizing the plant root. PGPR are also termed plant health promoting rhizobacteria (PHPR) or nodule promoting rhizobacteria (NPR).
- Rifat Hayat, Safdar Ali, Ummay Amara, Rabia Khalid, Iftikhar Ahmed
- 2010
Introduction. One gram of soil has been estimated to contain as many as 10 10 prokaryotic organisms. The number of bacterial species ranges from several hundred to almost nine thousand. These numbers have been used to estimate that there are 10 billion species of bacteria on Earth.
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Oct 9, 2023 · This review pays special emphasis on the types of microbial populations in the soil and how they influence plant growth, nutrient acquisition, inter-relationships between soil microbes and plants, stress resistance, carbon sequestration, and phytoremediation.
