They have been shown to inhibit aging in a plant because they stimulate protein synthesis. The most important of them is b-indolylacetic acid or IAA, 
They have been shown to inhibit aging in a plant because they stimulate protein synthesis. The most important of them is b-indolylacetic acid or IAA, a substance which is produced in the apex or leaves (*) of a plant. They influence phototropism by appearing in larger quantities in portions of the plant nearest to a light source and they are also key in the formation of roots. FTP, identify this substance, the first plant hormone to be discovered, that controls the lengthwise growth of a plant.
They have been shown to inhibit aging in a plant because they stimulate protein synthesis.
{Auxins}