Figure 2.

Effects of ABA on PP2A activity and formation of PP2A holoenzyme assembly. (A) ABA treatment and cold reduce PP2A activity in plant seedlings and seeds. MS, Murashige and Skoog medium; ABA 1 h, ABA 2 h, and ABA 24 h, plant seedlings were treated with ABA for 1, 2, and 24 hours, respectively. Bar indicates standard deviation. (B) Immunoprecipitation with PP2A-A antibodies brings down less PP2A-C subunits after ABA treatment. Proteins recognized by different antibodies are labeled on the right.