BIOL 1050 Lecture Notes - Lecture 6: Root Nodule, Root Hair, Bacteroides
3 Dec 2017
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Document Summary
Types of mutualistic associations: each party in the equation is participating and equally benefitting, 3 types of mas include: Legume-rhizobia: carbohydrates for fixed nitrogen: plant-mycorrhizal relations: carbs for phosphate, water. Service resource exchange: plant pollinator, receives nectar for pollen dispersion. Service exchange [rare]: acacia ants: thorns protect ants, ants deter herbivores from eating the plant: rhizobium associations. Big group of genera of rhizobia, species only work with specific types/biotypes of bacteria. Can induce root nodule formation and fix nitrogen a=in symbiosis with host legumes: cross-inoculation groups. Because of association only working with a certain species/variety of the bacteria. These groupings are called cross inoculation groups. Plant releases nutrients near root hair which attract rhizobia. They attach to the root hair with an adhesion protein. Lectins are important plant cell surface receptors. Root hair curls and rhiboz go to nucleus and influence transcription of genes needed for the symbiotic relationship.
