Effect of Increased Gravity on Root Growth

Overview

Objectives/Goals My objective was to see what effect increased gravity would have on root growth (not on root direction). I wanted to see if increased gravity would result in increased root length. Methods/Materials 4 different sets of red bean seeds were germinated. 3 sets were spun at different RPMs (33, 45 and 78)to provide the increased force, and the 4th set was germinated with no spin. After 7 days, the root lengths of the germinated seeds were recorded and the seeds were planted in cups and placed back on the turntables to continue growing for the next 22 days. At the end of the 22 days, the roots were rinsed and measured and the root lengths were recorded and graphed. Results The roots of the plants spun at 78 RPM were significantly longer than the roots of the plants spun at 33 RPM or 45 RPM, or the roots of the plants that were grown with no spin. The shoots of the 78 RPM plants were significantly shorter than the roots of the plants spun at a lower RPM or not spun at all. Conclusions/Discussion Increased gravitational force increases root length, but decreases shoot length.

Competition history

• CSEF 2010 Plant Biology · Entry J2015

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