PDC LESSON 4.18 SOIL - CHEMIE OF THE SOIL ORGANISM


 

PERMA COURSE AGRO-ECONOMY

PDC LESSON 4.18 SOIL - CHEMIE OF THE SOIL ORGANISM 


Chemistry between soil organisms & root systems

The presence of certain soil organisms (symbionts, pathogens, herbivores) is differentiated over a vertical gradient in the rhizosphere.

The interaction continuum between roots and soil biota is closely related to the gradients of root chemical traits.

✅Most of the insect herbivores are present in the top horizon of soils and interact with taproots.

✅Taproots are highly defended by chemicals against herbivores & pathogens.

✅Plant pathogenic nematodes and microbes generally infect fine roots which are the physically most vulnerable organ.

✅Root exudates are actively released from root tips, and contain various chemicals.

✅Beneficial microbes, such as mycorrhizal fungi rhizobia, and plant growth-promoting bacteria (PGPR), also interact mostly with fine roots, being attracted by the released chemicals.

*      Image: Overview of the interactions of soil organisms and root chemicals

*       (antagonists against plants were shown by orange letters and mutualists by blue)






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