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Mineral NutritionSoil-free culture• Sand culture• Hydroponics: immerse roots in nutrient solution• Slanted film maintains [nutrients] & O2
• Aeroponics sprays nutrient solution on roots
Mineral NutritionMacronutrients• CHOPNS make biopolymers• N deficiency • mobile in plant, so shows first in old leaves
Mineral NutritionMacronutrients• CHOPNS make biopolymers• P deficiency • mobile in plant, so shows first in old leaves
Mineral NutritionMacronutrients• CHOPNS make biopolymers• S deficiency • mobile in plant, so shows first in old leaves
Mineral NutritionMacronutrients• CHOPKNS• CHOPNS make biopolymers• K makes turgor, enzyme cofactor• mobile in plant, so shows first in old leaves
Mineral NutritionMacronutrients• CHOPKNS• Ca: signaling, middle lamella, cofactor• immobile in plant, so shows first in young leaves
Mineral NutritionMacronutrients• Ca: signaling, middle lamella, cofactor• Fe: cofactor• immobile in plant, so shows first in young leaves
Mineral NutritionMacronutrients• Ca: signaling, middle lamella, cofactor• Fe: cofactor• Mg: cofactor• mobile in plant, so shows first in old leaves
Mineral NutritionMacronutrients: CHOPKNSCaFeMg• Ca: signaling, middle lamella, cofactor• Fe: cofactor• Mg: cofactor• mobile in plant, so shows first in old leaves
Mineral NutritionMacronutrients: CHOPKNSCaFeMgBNaCl• Ca: signaling, middle lamella, cofactor• Fe: cofactor• Mg: cofactor• mobile in plant, so shows first in old leaves
Mineral NutritionMicronutrients: BNaCl• B: cell elongation. NA metabolism• immobile in plant, so shows first in young leaves
Mineral NutritionMicronutrients: BNaCl• B: cell elongation. NA metabolism• Na: PEP regeneration in C4, K substitute• mobile in plant, so shows first in old leaves
Mineral NutritionMicronutrients: BNaCl• B: cell elongation. NA metabolism• Na: PEP regenerationin C4, K substitute• Cl: water-splitting, osmotic balance• mobile in plant, so shows first in old leaves
Mineral NutritionMicronutrients: BNaCl others include Cu, Zn, Mn• B: cell elongation. NA metabolism• Na: PEP regeneration, K substitute• Cl: water-splitting, osmotic balance• Cu: cofactor• immobile in plant, so shows first in young leaves
Plant food• 2.6% ammoniacal nitrogen • 4.4% nitrate nitrogen• 9% phosphorus• 5% potassium• calcium (2%)• magnesium (0.5%)• sulfur (0.05%)• boron (0.02%)• chlorine (0.1%)• cobalt (0.0015%)• copper (0.05%)• iron (0.1%)• manganese (0.05%)• molybdenum (0.0009%)• nickel (0.0001%)• sodium (0.10%) • zinc (0.05%)
Mineral NutritionSoil nutrients• Amounts & availability vary• Many are immobile, eg P, Fe• Mobile nutrients come with soil H2O
Mineral NutritionSoil nutrients• Amounts & availability vary• Many are immobile, eg P, Fe• Mobile nutrients come with soil H2O• Immobiles must be “mined”• Root hairs get close
Mineral NutritionImmobile nutrients must be mined• Root hairs get close• Mycorrhizae get closer
Solubility varies w pH
Mineral NutritionSolubility varies w pH•5.5 is best compromise•Plants alter pH @ roots to
aid uptake
Mineral NutritionNutrients in soil•Plants alter pH @ roots to aid uptake• Also use symbionts• Mycorrhizal fungi help: especially with P
Mineral NutritionAlso use symbionts•Mycorrhizal fungi help: especially with P• P travels poorly: fungal hyphae are longer & thinner
Mineral NutritionAlso use symbionts•Mycorrhizal fungi help: especially with P• P travels poorly: fungal hyphae are longer & thinner• Fungi give plants nutrients
Mineral NutritionAlso use symbionts•Mycorrhizal fungi help: especially with P• P travels poorly: fungal hyphae are longer & thinner• Fungi give plants nutrients• Plants feed them sugar
Mineral NutritionAlso use symbionts•Mycorrhizal fungi help: especially with P• P travels poorly: fungal hyphae are longer & thinner• Fungi give plants nutrients• Plants feed them sugar
• Ectomycorrhizae surround root: only trees, esp. conifers
Mineral NutritionEctomycorrhizae surround root: only trees, esp. conifers• release nutrients into apoplast to be taken up by roots