Lecture 12 - Plant Mineral Nutrient 3

Question 1

phosphorus is often the ____ most commonly limiting nutrient for plant growth

Answer 1

1st or 2nd

Question 2

glycerophospholipid

Answer 2

major constituents of membranes

Question 3

where is phosphorus typically found

Answer 3

in organic matter and manure/feces

Question 4

t/f: there is lots of atmospheric P

Answer 4

f, the is essentially no atmospheric pool of P

Question 5

what form is P is assimilated by the plant

Answer 5

phosphate (Pi)

Question 6

what percent of the worlds phosphate rock reserves are in 5 countries

Answer 6

90%

Question 7

symptoms of P deficiency

Answer 7

• stunted plant growth
• abnormal dark-green color
• older tissue affected first
• reddish purple color accumulation of anthocyanin pigments

Question 8

depletion zone

Answer 8

soil area with direct contact with the roots where plants take up nutrients

Question 9

Arbuscular mycorrhizal fungi

Answer 9

facilitator for Pi uptake in most plants

Question 10

___ of plants associate with mycorrhizal fungi

Answer 10

80%

Question 11

how does root system architecture change for ideal phosphate foraging

Answer 11

• inhibition of primary root growth
• increase of root hair production and its length
• lateral root formation
• enhanced lateral root growth
• cluster roots

Question 12

types of phosphate transporters

Answer 12

PHT1 and PHO1

Question 13

PHT1

Answer 13

phosphate transporter that uses ATP to move Pi into the plant roots

Question 14

PHO1

Answer 14

phosphate exporter that move Pi into the xylem

Question 15

phosphorus cycle

Answer 15

phosphorus is assimilated and used as phosphate