Lec11MineralNutritionNotes

Wikipediaorgwikipotash specific roles of essential

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Unformatted text preview: re dependent – Aids in maintenance of osmotic potential • Stomatal function it is important for the osmotic potential in the stomata Mineral Nutrition http://en.wikipedia.org/wiki/Potash Specific Roles of Essential Elements • Sulfur (SO4-) it is cyclable – Actively and passively translocated – Important atom in several amino acids • Cysteine, methionine • Calcium (Ca+2) – Very immobile in the plant – Uptake and transport is passive – Component of cell wall once a plant ends up Ca++ in the cell wall it is going to stay there • Cementing substance: Ca-pectate Mineral Nutrition also it is a signaling molecule and also the cell wall has alot of calcium Specific Roles of Essential Elements • Magnesium (Mg+2) – Uptake is active and passive – Transport is via transport stream – Mg is mobile in the plant • Deficiencies appear in older leaves – Center of chlorophyll molecule Mineral Nutrition Specific Roles of Essential Elements • Iron (Fe+2, Fe+3, Fe) where it ends up it stays-immobile – Constituent of electron transport enzymes – Required for chloroplast formation – Highly immobile in the plant - not redistributed – Uptake affected by soil temperature Mineral Nutrition Specific Roles of Essential Elements • Copper (Cu+2) – Part of electron transport system in photosynthesis – Active uptake, passive transport • Sodium (Na) this is an alternative for potassium and can be used for osmotic potential(osmosis) – Needed for regeneration of PEP in C4 and CAM plants Mineral Nutrition Specific Roles of Essential Elements • Boron (BO3-3) – Uptake and transport primarily passive – Relatively immobile – Auxin cofactor used in number of things; like sugar transport • Adventitious root formation – Important to development of young organs – Important in sugar transport and polysaccharide formation – Accumulates in leaves, leaf margin chlorosis Pistachio production in San Joaquin Valley – Ground water is high in B, but free, freshwater low in B $$$ Mineral Nutrition Specific Roles of Essential Elements these elements are in very low concentration • Manganese (Mn+2) – Auxin cofactor • Zinc (Zn+2) it is important in the C3 plant bc it is the one involved when the first carbon taken up by CO2 – Carbonic anhydrase active metal – Essential for enzymes during IAA synthesis • Chlorine (Cl-) – Most common anion in nature (association with Na+) – Essential in PS II oxygen evolution Mineral Nutrition Essential Elements deficiency disorders means that too little of that element, is basically a non biological effect on the plant • Translocation of elements affects deficiency disorders (for info on deficiencies see http://5e.plantphys.net/article.php?id=289) • Mobile in plant (old leaves show signs first): important by the xylem or phloem. s – N, P, K, Mg, Cl, Na, Zn, Mo • Immobile in plant (young leaves show signs 1st): – Ca, S, Fe, B, Cu for these ones the mobility of the el...
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