My go-to genetic resource, the JI database has some interesting info on stem length in peas.
Genes coh, cona, and cot all shorten internodes. The database is silent on how these interact.
lh gives a 60-70% reduction in internode length
lka gives reduced internodes and "reduced branching and peduncle length, stem banding"
lkb and lkc also reduce internode length, with other physiological changes.
lm reduces internodes but effects roots.
lw gives "reduced internode length by 50%. Delayed flowering especially under short days"
na is "compact dwarf with extremely shortened internodes"
|Short internodes on Delta Louisa - perhaps a hint of zig zag?|
So, I wonder which of these genes is regulating internode length in Delta Louisa, Oreson Spring, Sugar Snap Bush, and Sahali, all of which exhibit short or shortish stems...