Subject: How can I inhibit abscisic acid in plants?

I am conducting an experiment for a science fair project. I am aiming to 
exhibit what geotropism is and how it affects plant growth. For my 
experiment, i am planning to grow plants at different angles (upside down, 
sideways, for example) to see if geotropism always makes a plant's root 
grow towards the center of the earth. As a component of the experiment, i 
want to inhibit geotropism in some of my plants (to see if the plants will 
continue to grow normally even though they are upside down- like if the 
roots will grow upward and the stems down). I know that abscisic acid is a 
part of why geotropism can effect plants. But i want to know how to inhibit 
the abscisic acid so i can eliminate the effects of geotropism in my 
experiment to compare the plants that havent been effected with those that 
have.

Re: How can I inhibit abscisic acid in plants?