5 public questions tagged with this topic.
Glomus forms mycorrhizal associations with plant roots and enhances phosphorus absorption.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biofertilizers - Rhizobium Azospirillum Mycorrhiza Cyanobacteria
Pinus forms a mycorrhizal association where fungi help in nutrient absorption and nitrogen fixation.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Gymnosperms - Characteristics and Life Cycle
Mycorrhiza is a symbiotic association between fungi and the roots of higher plants. Fungi may also live symbiotically with algae, forming lichens.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
Arbuscules denote finely branched intracellular haustorial structures formed by glomeromycotan mycorrhizal fungi within root cortical cells of vascular plants including most crops. Arbuscule branches massively increase interfacial surface area for bidirectional nutrient exchange: fungus delivers phosphate and micronutrients absorbed from soil via extraradical hyphae to plant, plant supplies photosynthate carbohydrates and lipids to obligate fungal symbiont. Formed during arbuscular mycorrhizal symbiosis oldest and most widespread mutualism dating ~400 million years. Not associated with parasitic, saprophytic or predatory strategies but mutualistic mycorrhizal interface.
Ref: Campbell Biology 12th ed., Chapter 31: Mycorrhizae Arbuscules Exchange; NCERT Class 12 Biology Mycorrhizae; NCBI Glomeromycota Symbiosis Review
Mycorrhiza is a resource-based mutualism between a fungus and a plant root. Fungal hyphae extend far beyond the root depletion zone and efficiently acquire phosphorus, nitrogen, micronutrients, and water from a larger soil volume. These resources are transferred to the plant, while the fungus receives photosynthetically fixed carbon, mainly sugars and lipids. Arbuscular mycorrhizal fungi enter root cortical cells and form branched arbuscules for exchange; ectomycorrhizal fungi form a mantle and Hartig net around root cells. The association may also improve stress tolerance or pathogen resistance, but reciprocal nutrient exchange is its core mechanism. Commensalism would imply no effect on the plant, which contradicts the usual nutritional benefit. Defensive mutualism emphasizes enemy protection rather than resource trading, and inquilinism concerns use of another organism as living space. Costs and benefits vary with soil fertility and carbon availability, so some associations can become less beneficial, but the canonical plant–fungus relationship is based on complementary resource acquisition.
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13
