Let us make an in-depth study of the mechanism of gibberellin action in higher plants. After reading this article you will learn about A. Promotion of Stem Elongation and B. Mobilization of Endosperm Food Reserves. Gibberellins (GAs) are very active molecules even at very low concentrations. Responses of gibberellins in stem elongation of lettuce/rice seedlings at concs. of 10-10 g [...]
The following points highlight the four molecular mechanisms of auxin action in plants. The molecular mechanisms are: 1. An Auxin-binding Receptor has been Discovered 2. Auxin Causes Rapid Changes in Gene Activity 3. Some Signalling Intermediates (Secondary Messengers) have been Implicated in Auxin Action and 4. There are Two Categories of Auxin-Induced Genes-Early Genes and Late Genes. Molecular Mechanism # [...]
The following points highlight the eight physiological effects of auxin in plants. The physiological effects are: 1. Cell Elongation 2. Apical Dominance 3. Root Initiation 4. Prevention of Abscission 5. Parthenocarpy 6. Respiration 7. Callus Formation and 8. Vascular Differentiation. Physiological Effect # 1. Cell Elongation: The primary physiological effect of auxin in plants is to stimulate the elongation of [...]