Poplar tree growing fast and tall:
how do your genes make your cell walls?
Enzymes string together sugars into rows,
to make straight fibers you know as cellulose;
Reverse this process during cell wall degradation,
and you get sugars for biofuel creation!
Alas there’s also lignin, an amorphous beast;
lignin linked to cellulose blocks sugar release.
To solve this recalcitrance, the genome holds the key,
let’s make better poplar — for sustainable energy!