Symbiotic nitrogen fixers

Question 1

the most important symbiosis known?

Answer 1

The mutualistic relationship between leguminous plants and nitrogen-fixing bacteria

Question 2

Example of legumes include?

Answer 2

soybeans,clover,alfalfa,beans and peas

Question 3

Rhizobium?

Answer 3

the best-known nitrogen fixing bacteria engagin in these symbioses

Question 4

Colonization of legume roots by nitrogen-fixing bacteria leads to?

Answer 4

the formation of root nodules that fix nitrogen

Question 5

nodule formation nombre de steps?

Answer 5

6

Question 6

step 1 of nodule formation ?

Answer 6

Recognition and attachment of bacterium to root hairs

Question 7

Step 2 of nodule formmation ?

Answer 7

Excretion of nod factors by the bacterium

Question 8

Step 3 of nodule formation?

Answer 8

Bacterial invasion of the root hair

Question 9

Step 4 of nodule formation ?

Answer 9

Travel to the main root via the infection thread (tube composed of cellulose)

Question 10

Step 5

Answer 10

Formation of bacteroid state within plant cell

Question 11

bacteroid

Answer 11

swollen and misshapen bacteria - fix N2

Question 12

Step 6?

Answer 12

-Continued plant
-bacterial division
forming the mature root nodul

Question 13

nod factors?

Answer 13

oligosaccharide signaling molecules

Question 14

why do we need to control oxygen level?

Answer 14

so te nitrogen fixing bacteria can do their job

Question 15

how is the oxygen level kept in check?

Answer 15

Oxygen levels are controlled by the O2-binding protein leghemoglobin

Question 16

who produces leghemoglobin?

Answer 16

plant cells

Question 17

Bacteroids are?

Answer 17

terminal structure and cannot be shed in the environment

Question 18

but the nodules contains something that CAN inoculate the environment and that is ?

Answer 18

Rhizobium

Question 19

en gros?

Answer 19

the plant provides organic acids to the bacteroid and in return the bacteroid provides ammonia to make nitrogen containing organic compounds

Question 20

how is nitrogen fixation in aerial roots in Sierra mixe maize?

Answer 20

through mucilage-associated microbiota

Question 21

(SMM) can acquire ____ of its nitrogen form the air?

Answer 21

29%-82%

Question 22

the N is fixed by bcateria in ?

Answer 22

the mucilage

Question 23

Mucilage?

Answer 23

viscous sugar-rich fluid

secreted by some plants

Question 24

Mucilage what do u find inside?

Answer 24

• diverse community of bacteria

- Including N fixers ( Rhizobiaceae)