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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the three essential macronutrients? |
N, P, K |
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An element is considered essential if |
1) in its absence the plant can't complete its normal lifecycle. 2) is an essential plant constituent or metabolite. |
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Critical Concentration |
A plants requirement for a particular element - the concentration measured in the tissue |
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Nutrients that are part of carbon compounds |
N, S |
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N requirements (needed for...) |
Required in greatest amounts Absorbed in the form of Nitrate ion (NO3-) |
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N functions |
Constituent of proteins, nucleic acids, hormones, chlorophyll |
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N (deficiency symptoms) |
Chlorosis, first evident in older leaves, anthocyanin accumulation |
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N (excess) |
Shoot growth vs root development, delay in the onset of flowering. |
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S (Function) |
Taken up as sulfate anion (SO42-) Protein structure-disulfide bonds,(-S-S-) between neighboring cysteine & methionine) secondary/tertiary structure, protein folding; Fe-S proteins (ferredoxin-photosynthesis)
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S (function cont..) |
(iso)thiocyanates-flavor of mustard, horseradish, turnips, cabbages as defense against herbivores. Vitamins-thiamine,biotin Coenzyme A - respiration, fatty acid metabolism |
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S (deficiency) |
*is rare-micro-organisms that oxidize sulfides & decompose organic sulfur; volcanoes, geysers are the source of atmospheric SO2 & SO3 Symptoms-evident in younger leaves: chlorosis around the vascular tissue, due to reduced protein synthesis - affects chlorophyll stabilization in the thylakoid membranes. |
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