The Effects of Gibberellic Acid on Plant Growth

Overview

Just like humans, plants also have hormones. One of these hormones, gibberellin, plays a key role in plant growth. Humans have found they are able to add or remove this hormone, gibberellic acid, from plants. The question still remains, how does gibberellic acid effect plant growth? My hypothesis was if a higher concentration of gibberellic acid was sprayed on the plant, the plant would grow taller. Rosette-Dwarf Fast Plants, a plant that produces less gibberellic acid than regular Fast Plants, were used for the experiment. The gibberellic acid was diluted to 25, 50, 100, and 200 parts per million, or ppm. A quad with four plants was sprayed with each level of acid, along with a control quad that received no acid. The acid was only sprayed once. After they were sprayed, the pants were placed in a greenhouse on a water reservoir. Every plant that received the acid grew to a height taller than the controls, but the plant that grew the tallest only received 100 ppm. This plant grew to a height of 140 mm, while the controls had a maximum height of 15 mm. The plants soon died due to their quick lifecycle, and in the end, my hypothesis was proven incorrect. The plants that received the most gibberellic acid didn't grow the tallest. The controls still grew the shortest, but the 100 ppm plants grew the tallest, with the 200 ppm behind them.

Competition history

• JSHS 2020 Category not listed

Resources

• National JSHS abstract book ↗

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