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Weed control, management, ecology, and minutia
Comments:
by Steve
on September 12, 2018 at 1:37 PM
I'm not sure what the above picture regarding translocation represents with regard to plants tested, but if representative  
of plant maturity, it could highly suggest that above weeds should have been treated at earlier maturity. Especially before they had ability to reform as lateral buds.
by Brad Hanson
on September 12, 2018 at 2:10 PM
Hi Steve,  
I'd interpret the four images represent to represent what would happen to one plant over time following the application. Day 1 is the day of treatment, the next one is 2 days later (48 hours after treatment), the third and four ones are 1 week and 2 weeks after treatment (WAT). The point of the red leaves at 48 HAT and then the "empty" boxes at 1 and 2 WAT is that the apical meristem died. The 4 WAT plant is bigger because it's had 14 more days to grow since the sub-lethal herbicide treatment.  
 
When the apical meristem is absent, there is often a response where lateral buds are released because of a change in hormone levels (IAA vs cytokinin). Essentially, the apical meristem forces the axillary (or lateral) meristems to remain dormant but this suppressive effect is removed when the apical portion is killed/removed.  
 
You can find information on some really classic plant physiology experiments that were used to help understand plant hormones and hormonal effects like this if you search "plant apical dominance" or similar terms.
 
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