lecture 13 Flashcards
1
Q
which nutrients are the ‘twins’? and why
A
Potassium (K) and Sodium (N)
-both have a single electron in the outer shell
2
Q
K deficiency symptoms
A
- substantial growth reduction
-yellowing on oldest leaves
3
Q
4 uses of K in a plant
A
- functions as a counterion for negatively charged molecules - provides stability of dynamic structure
- cofactor in some enzymatic reactions
- main cation in vacuoles
- generates turgor for structure
4
Q
two K transporters
A
HAK - High-affinity K transporter
AKT - Arabidopsis K transporter
5
Q
as K+ becomes limiting, it becomes allocated to the…
A
cytosol
6
Q
is sodium toxic to plants?
A
yes
7
Q
3 things Ca does in a plant
A
- forms a constituent of middle lamella of cell wall - binds daughter cells together
- required at external surface of plasma membrane for integrity
- acts as a second messenger in signal transduction
8
Q
3 things Mg does in a plant
A
- enzyme activities
- energy transduction
- chlorophyll structure
