Plant-Microbial Relationships

Question 1

Legume-rhizobium symbiosis

Answer 1

biological nitrogen fixation from atmospheric N2 to plant available NH3

Question 2

Flavonoids

Answer 2

Secondary metabolites released by plants when they are N starved. induced nod genes which releases enzymes to start nod factor

Question 3

Nitrogen is __%. why is it not plant available?

Answer 3

78%. cannot be directly taken on by plants through the gas exchange

Question 4

Leghemoglobin

Answer 4

protects nitrogenase enzyme from being destroyed by O2

Question 5

Nitrogenase

Answer 5

enzyme that catalyzes nitrogen fixation

Question 6

How can you tell if a legume crop is fixing nitrogen?

Answer 6

Nodes on roots will be pink in colour

Question 7

End product inhibited

Answer 7

will only happen if the plant is starved

Question 8

Legumes can derive anywhere from __-__% of their total N from fixation

Answer 8

40-80%

Question 9

Which plants do Mycorrhizal fungi not associate with?

Answer 9

Brassica family. canola, mustard, cabbage, broccoli

Question 10

Arbuscular mycorrhizal fungi importance location

Answer 10

agriculture systems

Question 11

Ectomycorrhizal fungi importance location

Answer 11

Forest systems

Question 12

Structures that mycorrhizae fungi form

Answer 12

hypae

Question 13

What does the hyphal network aquire?

Answer 13

water and immobile nutrients such as phosphorus

Question 14

AMF can make up __-__% of agricultural soil biomass

Answer 14

20-30

Question 15

What kills mycorrhizae?

Answer 15

tillage and not having plants to feed on

Question 16

Plant growth promoting rhizobacteria

Answer 16

organisms in the rhizosphere that promote plant performance