Examining the Role of Ethylene in the Transport of Indole-3-Acetic Acid during the Negative Gravitropic Response of Snapdragon (Antirrhinum majus L . ) Shoots
Shin, Thomas A.
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This study attempts to elucidate the mechanism of auxin transport during the negative gravitropic response of snapdragon (Anthirrhinum majus L.), shoots by targeting the plant auxin indole-3-acetic acid or lAA. The study attempts to find a possible role for the gas ethylene during the longitudinal transport of lAA down from the apical to the basal end in the plant stalk. Several other studies have concluded that ethylene is in fact a factor during gravitropic responses as well as asymmetric bending from other environmental responses, such as phototropism. However, the possible correlation of lAA with ethylene and its mechanism has not been fully understood. With the use of radiolabeled IAA and ethylene inhibition solutions, it was found that inhibiting ethylene formation lowered the rate at which lAA traveled vertically through the plant shoot.