naoki
Well-Known Member
http://www.pnas.org/content/92/10/4076.full.pdf
Check this out.
The plant physiologists have no problems linking disease resistance to salicylic acid which seems to be a natural phenomena in all plants (not just white willow!).
But it also seems to be established data that salicylic acid suppresses K and PO4 uptake by plants. Could this also suggest the inverse that high K and P inhibit the production of salicylic acid production in plants?:evil:
Why would the immune response in plants include an inhibition of K and P uptake?
Cool, I will take a look (when I get some time, which might not happen for a while). But, I'm guessing that it is unlikely that the inverse occurs. For some reason, SA might be signaling to reduce K, P uptake. But SA synthesis is likely to be determined by other processes (which needs to signal the other cells). SA signal is also used for other stressful condition (e.g. dehydration), so maybe if there isn't enough water, they might be stopping nutrient uptake because concentration in the cell may become too high?
The example Cheyenne points out is very cool phenomenon. I think "parasitic" Corallorhiza is the typical example. But I wouldn't say that trees are helping those orchids. It's just an example of heterotrophs; i.e. zebras (trees) aren't "helping" lions (orchids) by getting eaten.