Plant start's to sag

I have this one plant that's outside when ever it in the direct sun it starts to drewp and the leaves lay flat even at the top,the soil is most, and when you put it
in the shade it comes right back up. It's in a 5 gal smart pot and it's about 48" tall and it sit in a wagon,All the other plant are fine.

roots are getting too hot for that particular phenos comfort level.

122 looks and only one thought ,come on give it at lest a guess????????

It's probably an indica-dominant genetic defence. Indicas have more chloraphil and darker leaves to absorb more energy in other regions. Sativas have less chlorophil and lighter leaves to withstand harsher sun. Just the way an indoor plant grows towards the light, yours is trying to avoid sun burn. Are the leaves droopy like soggy or are they mostly facing the same way?

You should put in a bigger pot.