some of my bananas looked like his pic after it dipped down to 41f. they greened back up again when it got warmer. but some parts of the leaves turned yellow instead of green. the bananas that did it were all of my dwarf reds, gros michels and my kandarin. here is a picture taken about 2 weeks later of some of them.
also in the picture are namwas, mona lisa, manzano, Brazilian, sumatrana x, pisang raja, lady finger, sweetheart.
there is one not in the picture, my snow banana, the leaves turned in the mid 40s. they never greened back up again.