Lecture 13 - Plant Mineral Nutrient 4 Flashcards
what 2 nutrients are considered “twins”
potassium and sodium
what is the difference between potassium and sodium
potassium is an essential nutrient
sodium is toxic
symptoms of potassium (K) deficiency
- growth reduction
- yellowing appears on oldest leaves
- brown necrotic lesions develop within the yellow parts and eventually spread to cover the entire leaf blade
where is potash mined from
underground reserves
where is almost half the worlds reserves of potash found
Saskatchewan, Canada
potash provides ____ for fertilizers
K+
why is potassium an essential plant nutrient
- counters negatively charged molecules
- provides stability of dynamic structures for DNA and proteins
- cofactor in some enzymatic reactions
- main cation in vacuoles
- generates turgor to provide structure
2 types of potassium transport
high affinity and low affinity transport
does high or low affinity K transporters use energy
high affinity uses ATP
in what K concentration does the plant use high affinity transport
low concentration
in what K concentration does the plant use low affinity transport
high concentration
as K+ becomes limiting, it is allocated to the _____
cytosol
homeostasis
ability of an organism to maintain an internal stability in response to environmental changes
how do plants handle sodium in their bodies
high affinity K transporters prevent Na from reaching photosynthetic cells
Na+ and K+ _____ with each others uptake
interferes
