Nutrient Capture Flashcards Preview

Plant-Environment Interactions > Nutrient Capture > Flashcards

Flashcards in Nutrient Capture Deck (37):
1

Nutrients obtained from carbon dioxide and water:

Carbon, Hydrogen and Oxygen

2

Nutrients obtained from soil macro-nutrients

N, K, Ca, Mg, P, S and Si

3

Nutrients obtained from soil micro-nutrients

Fe, B, Mn, Cl, Na, Zn, Cu, Ni and Mo

4

Nutrients that are part of carbon compounds

Nitrogen and sulfur

5

Nutrients that are important in energy storage or structural integrity

Phosphorous, silica and boron

6

Nutrients that remain in ionic form

K, Ca, Mg, Cl, Mn and Na

7

Nutrients that are involved in redox reactions

Fe, Zn, Cu, Ni and Mo

8

Soil __ affects nutrient availability in soils.

pH

9

Which vessel is glucose carried in and how does it get there?

Phloem, actively pumped

10

Ways that root structure can adapt to low nutrient availability:

Proteiod roots (e.g. Lupinus albus) - low P
Extra lateral roots - low Fe
Relationships with fungi - rhizosphere

11

What do proteiod roots do?

Adaptation to low phosphate
Increase solubility of phosphorous in soil by secreting citric acid (down pH)

12

Rate of ion transport across membranes depends on:

size of molecule
magnitude of conc. gradient
viscosity of medium
temperature

13

Transport of ions across membranes, short distances:

diffusion

14

Transport of ions across membranes, long-distance:

Pumps - solute
Symporters - 2 solutes in same direction
Antiporters - 2 solutes in opposite direction
Secondary active transport - e.g. active transport of proteins to drive active transport of other ions

15

How can you test whether active or passive transport?

Measure membrane potential and concentration of ion inside and outside of cell.

16

Symptom(s) of Ca Deficiency

New leaves misshapen or stunted
Existing leaves remain green

17

Symptom(s) of N Deficiency

Upper leave light green
Lower leaves yellow
Bottom leaves yellow and shrivelled

18

Symptom(s) of Zn Deficiency

Chlorosis between veins (yellowing of leaf tissue due to lack of chlorophyll)
Yellowing of tips and margins
Spreading grey-brown spots

19

Symptom(s) of P Deficiency

Leaves darker than normal
Loss of leaves

20

Symptom(s) of Fe Deficiency

Young leaves yellow/white with green veins
Mature leaves normal

21

Symptom(s) of K Deficiency

Yellowing of tips and edges (esp. in young leaves)
Dead or yellow patches or spots develop on leaves

22

Symptom(s) of Mn Deficiency

Yellow spots and/or elongated holes between veins

23

Symptom(s) of Mg Deficiency

Lower leaves turn yellow from edge inwards
Veins remain green

24

Routes for uptake of nutrients from rhizosphere

Apoplastic
Symplastic

25

Where does nitrogen in the environment accumulate from?

decomposing processes
lightning
fires

26

What fixes atmospheric nitrogen (N2)?

diazotrophic bacteria

27

How is nitrogen transported from the root to the xylem and phloem?

symplastic pathways

28

Which do plant roots prefer, NH4+ or NO3-?

NO3-

29

What is the NH4+ transporter?

AMT1

30

What is the NO3- transporter?

HATS and LATS
(high and low affinity transport systems)

31

In what forms in phosphorous available to plants?

PO3 3-, HPO3 2- and H2PO3-

32

What transports Pi in plants?

PH1 (high affinity), PHT2 and PH3

33

What is the importance of arbuscular mycirrhiza in Pi uptake?

Secretes phosphatases that mobilize Pi from rock sources of P

34

What is pumped from the roots to make Fe more soluble?

H+
(Fe3+ + H+ -> Fe2+)

35

What carries Fe into the epidermis?

AtIRT1 transporter

36

In what form is Fe take up by roots?

Fe2+

37

Name a high affinity Fe(II) transporter

IRT1