Flashcard Set Preview
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| 1 |
Characteristics of Rhizobacteria
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G(-);alpha proteobact; sm mobile rods;widespread (soil); Agrobact & Brucella (Non-N fixing);...
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| 2 |
DIFFERENCES between Agrobact and Rhizobium
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Agro: lg Ti plasmid; sense signal is Phonolics; req wound
Rhizo: lg "sym" plasmid; sense signal...
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DIFFERENCES between Agrobact and Rhizobium
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Agro: extracell infection; uncontrolled gall; GET N&C from opines
Rhizo: intracell infection;...
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| 4 |
How do specific plants associate with specific Rhizobia?
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Diff. Rhizobia produce different Nod factors (Flavonoid signals have diff structures).
Diff....
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| 5 |
Describe Nod pathway
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NodD recog. Flavonoid-->NodABC expression-->Synth of Nod factors (have Acyl side chains)-->nodule...
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| 6 |
Rhizobacteria (BLANK) for plants.
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Fix Nitrogen
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(BLANK1) crops replenish soil.
NH4 encourages (BLANK2).
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1. Legumes
2. Nodule growth
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T/F. NH4 inhibits nodulation.
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TRUE. Once plant has enough NH4 may inhibit flavonoid synth and inhibit more nodules
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| 9 |
Are all nodules the same?
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NO. Small nodules do not fix N as well as large (effective) nodules.
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| 10 |
Adding Rhizobia to soil - problems?
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Do not compete well. Indigenous Rhizobia out-compete the inoculant Rhizobia.
Recent legume=more...
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| 11 |
Inoculant Rhizobia is most effective after how many years without legume rotation?
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3 years.
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