Mineral Nutrition in Plants I. When one tugs at a single thing in nature, (s)he finds it attached to the rest of the world. John Muir. Assimilation. Every organism is an open system connected to its environment by a continuous exchange of energy and nutrients....
When one tugs at a single thing in nature, (s)he finds it attached to the rest of the world.
…prelude to Chapter 37, Cambell and Reece.
…growth and development are a plant’s version of locomotion,
Programmed Cell DeathWhere does it go?
H2O or CO2
SoilRelative Elemental Analysis of Plants
Use for reference, but we’ll organize the nutrients according to biochemical function.
Group 1. Nutrients that are part of carbon compounds.
Group 2. Nutrients that are important in energy storage or structural integrity.
Group 3. Nutrients that remain in ionic form.
Group 4. Nutrients that are involved in redox reactions.
low S according to
high SStructural Elements, Covalently Bonded IGroup 1: Nutrients that are parts of carbon compounds...
Plants assimilate these nutrients via biochemical reactions involving oxidation and reduction.
Transport in the xylem sap to leaves.
Some assimilation into cysteine in the root,
Secondary Active Transport
…antioxidant. according to
Metal ions or toxins according to
Accumulation in harvestable shoot tissue.
Equisetum hyemale according to
SiobligateStructural Elements, Covalently Bonded IIGroup 2: Nutrients that important for energy storage or structure...
11 different sugar monomers,
> 21 enzymes required for synthesis.
Structure is conserved in the cell walls of all higher plants,
saturation according to
thresholdDose Response Curves
Difficult in Soils
Mineral deficiencies are relatively easy to identify in controlled conditions.
Nutrients classified based on their tendency to re-translocate during deficiencies.Recognizing Deficiencies
K re-translocate during deficiencies.+ Transport
1. K+ is transported across the root cell plasma membrane,
2. K+ is transported from the root symplast to the xylem,
3. K+ is transported via xylem sap to the older leaves,
- or, K+diffuses into, or out of the phloem.
5. Moves in source-sink direction.
Means for using excess carbohydrates. re-translocate during deficiencies.Deficiency CharacteristicsGroup 1: Nutrients that are parts of carbon compounds...
Width of bar corresponds to relative availability