A study in the British Journal of Sports Medicine found a strong correlation between maximal strength in Half Squats and jumping height.
This suggests that the major muscles involved in the Half Squat (glutes, adductor magnus and hamstrings) should be trained to maximize jump height.
Train the lower body with Squats, Deadlifts and Split Squats to build the hip extensor muscles.
Prioritizing Split Squats could be of benefit, as one study found they activated the gluteus medius and hamstrings to a greater extent than normal Squats.
Another study found the hamstrings are activated better in the Rear Foot Elevated Split Squat than during Back Squats.