Wow that was a shitty article, with very little real info; and i couldn't be bothered to search the actual journal's obtuse listings.
But just for the sake of argument i'm assuming that the sun that normal trees already get their UV from will induce the red emissions. I'm also assuming that the red glow is delayed in some way and happens after nightfall. Like, it's brought about by some reaction during the trees' dark phase of photosynthesis... what is it, i can't remember, respiration?
Or maybe the energy is somehow stored between the gold/chlorophyl interface and takes al night to dissipate as red light...
In any case my point is that the requirement for UV energy input isn't a deal breaker all by itself.
However there is no substantial info here with which to make a determination.
Did anyone who tracked down the actual article have any insight?
BTW did ya'll like how the crappy, crappy "magazine" that TFA was in just dug up some random false-color, infrared pics of completely unrelated trees and posted them with the article. Nice!. ;)