Fungal Haustoria

A brief description about special fungal structure-haustoria

1. A Presentation On

2. Presented by, Preyangka Saha Briste M.S. student Department of Plant Pathology, Bangabandhu Sheikh Mujibur Rahman Agricultural University

3. What are fungal haustoria ? Fungal haustoria are feeding organs that are produced from spores that germinate on the surface of plants. It is a specialized structure of certain parasitic fungi that penetrates the cells of the host plant to absorb nutrients . specialized structure of certain parasitic fungi that are produced from spores that germinate on the surface of plants and penetrates the cells of the host plant to absorb nutrients

4. Fig : Showing typical f ungal haustorium

5. What type of fungi produce haustoria ? Haustorium production is limited to fungi that need their host plant to be alive for at least part of the life cycle . Biotrophic fungi are fungal pathogens that require a living plant for all of their life cycle . Such pathogens produce these specialized feeding structures . Examples of biotrophic fungi are the downy mildews, the powdery mildews, and the rusts.

6. Fig: Haustorial complex, a specialized feeding organ of biotrophic fungal parasites of plants. 

7. Fig: Showing invagination of host cell and uptake of nutrients by fungal haustorium

8. Mechanism of haustoria development Germination of spore Formation of germ-tube Appresoria Penetration peg Infection hyphe Haustoria

9. Fig: Mechanism of haustoria development

10. Shapes of fungal haustoria Small, rounded , button like Branched Highly branched

11. Fig: Haustoria produced by Puccinia sp Fig: Haustoria produced by Erysiphe sp Fig : Haustoria produced by Albugo sp

12. Results of haustoria penetration into host cells Fungi that do not kill their hosts utilize specialized feeding structures called haustoria . These structures are formed from a hyphal tip that penetrates into the host cell and forms a union with the plant’s plasma membrane which serves as the site for the uptake of nutrients . This constant drain of nutrients results in yield losses, discoloration and are visibly stunted in their growth.

13. Fig: Results of nutrient absorbtion by haustoria from host cell

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