Genetic analyses of the interaction between abscisic acid and gibberellins in the control of leaf development in Arabidopsis thaliana

•ABA and GA are essential for but play distinct roles in the control of leaf growth.•The ABA-deficient aba2 mutant dominates leaf growth regardless of GA levels.•Under normal or ABA-accumulating conditions, GA plays a positive role in leaf growth.•ABA and GA interaction coordinates multiple pathways in the control of leaf growth.