AoB PLANTSNews in Brief Abscisic acid inhibits hypocotyl elongation acting on gibberellins, DELLA proteins and auxin Hypocotyl elongation of Arabidopsis seedlings is influenced by light and numerous growth factors. Light inhibits hypocotyl elongation (photomorphogenesis), whereas elongation is promoted in the dark (skotomorphogenesis)... William SalterNovember 26, 2018