13505292
Descrição
FlashCards por J yadonknow, atualizado more than 1 year ago
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Criado por J yadonknow
quase 7 anos atrás
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| Questão | Responda |
| Deficiencies as a result of cereal diets | Fe and Zn |
| NPK fertiliser | N Org compounds P Sugar phosphates K Osmotic relations, signalling, enzyme cofactors |
| 2' Nutrients | S - in AA Ca - cell signalling Mg - chlorophyll |
| Micronutrients | Fe - cytochromes B - holds CW together Zn,Cu,Mg,Mo - Enzyme cofactors |
| Group 1 nutrients | Form part of carbon compound N,s. |
| Group 2 nutrients | Energy storage for structural integrity P,S,B |
| Group 3 nutrients | Remain in ionic form K,Ca,Mg,Cl,Zn,Na |
| Group 4 nutrients | Involved in redox reactions Fe,Mn,Cu,Ni,Mo |
| Diagram showing nutrient quantity requirements of plants | Deficiency zone Adequate zone Toxic zone Growth of yield (% of max) % of nutrient in tissue (mmol/g dry weight) |
| Soil pH | Effects nutrient availability |
| Root structure | Dicot - tap root w/ branching lateral+ephemeral feeder roots Monocots - fibrous root sytem |
| Casparian strip | Mediates interactions w/ microbes Regulates entry into xylem |
| Monocot root structure | Epidermis Cortex endodermis xylem* phloem* *=stele |
| Xylem loading | Regulate at casparian strip Specialised transporters expressed in pericycle + xylem parenchyma |
| Membrane permeability depends on: | Composition of membrane Chemical nature of solute |
| Nature of channels dictated by: | Size of pore Density and nature of surface charges on interior lining sometimes gated |
| Carrier proteins | Facilitated diffusion Highly selective much slower than channels |
| Active transport | Nutrients that need transporting against their electrochemical gradient |
| 2' AT | In animals solute-coupled transport linked to Na+ In plants solute-coupled transport linked to H+ |
| K+ influx curve | high affinity low capacity Na+/K+ symporter A.T. low affinity high capacity Voltage-dependent channel Passive diffusion R.O.K+ uptake (umolg-1 k-1) [KCl] (mM) |
| Metabolism changes in the day | Night:Low met. need Small nutrient requirement Day:Photosynth+met high Stomata open, higher transpiration Able to transport nutrients |
| Nitrogen uptake coupled to clock | N enters root as NO3- via Nitrate transporters mRNA transcripts of nitrate transporter genes peak just before the start of the day. |
| Carnivorous plants | Get lots of nutrients from animals rather than soil |
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