Fibonacci Phyllotaxis in French Marigolds

Overview

Objectives/Goals To observe if excess light affects the Fibonacci phyllotaxis of marigolds thorough mutations. Methods/Materials Cardboard boxes, 75watt plant bulbs, Six French Marigolds, Water, Lampshades, Wiring. To test, grow Marigolds under varying amounts of light until a sufficient amount of buds is grown to accommodate an accurate test group. Observe each marigold for mutations in petal shape or count. Results : Marigolds grew mutations throughout all groups including control, all mutations were similar in shape and Group-1 the control, received 10 hours of light, had mutations in two of three remaining flowers, the other 3 flowers died off before being able to bloom. In Group-2, three of three flowers had mutations, the remainder of plants died off before being able to bloom. In Group-3 one of three flowers had mutations, remainder of flowers die off before being able to bloom. All marigolds with mutations had an #m# mutation where the petal tip was an extreme #m# shape. No marigolds had phyllotaxis mutations Conclusions/Discussion Marigolds do mutate under light, however the extent and probability of mutations is unknown because of insufficient an insufficient testing size. No phyllotaxis errors occurred during the testing period. French Marigolds have a phyllotaxis that is sufficient in most amounts of light.

Competition history

• CSEF 2012 Plant Biology · Entry J1934

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