1 - Plant Hormones
This site provides extensive information which is a requisite for plant hormone research.

2 - Role of Auxin, Gibberellin and Ethylene in the Size, Pattern, and Orientation of Regenerative Tracheids
Pine trees as used as a model for illustrating the role of individual hormones.

3 - Botany Tutorial
Your personal tutor includes a discussion of plant growth.

4 - A Start at a Comprehensive Theory of Plant Hormones
An overview of the hormonal control of plant growth is presented.

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