Lecture 10: Plant microbiome Flashcards
Microbiome niches
Below ground in rhizosphere
Above ground in phyllosphere
Rhizodeposition
organic C exuded from roots influences microbe activity in soils
Important roles of microbes in agriculture
reduce GHGe, PGPR, pathogens, suppress pathogens, acquire nutrients, bioremediation (toxic metals)
Microbes can be tolerant to
temperature, drought, insects, waterlogging, minerals, pests and pathogens, nutrient limitation
Most important microbe in drought tolerance
bacillus subtilis produces cytokinin for shoot growth
Most important microbe for insecticidal activity and priming
Pseudomonas and Bacillus
Most important microbe ROLE in waterlogging
breakdwon ACC which stops ethylene stress signalling
Most important bacteria for pathogens
Pseudomonas fluorescens for fungal resistance produce antibiotics
Most important symbioses for nutrients
Rhizobia-legumes
How has microbiome research changed?
Since 19th century improved tech and imaging from culturing to eDNA to real time imaging and RNA analysis
Phylogeny of microbes
Linnean
diverse
few phyla dominate
Dominant microbial phyla
proteobacteria, bacteroidetes, actinobacteria
Direct microbial inoculant issues
low efficacy in field as outcompeted by native biome
Microbial solubilisation
change in physiology reduced pH of inorganic pool to labile forms
Microbial mineralisation
breakdown organic pool to give more accessible form
