Light and Plant Growth

  1. Photomorphogenesis
    1. Definition and Significance
      1. Distinction from Photosynthesis
        1. Importance in Plant Life Cycle
        2. Plant Photoreceptors
          1. Phytochromes
            1. Sensing Red and Far-Red Light
              1. Pr and Pfr Forms
                1. Role in Shade Avoidance
                  1. Role in Germination
                    1. Photoreversible Responses
                    2. Cryptochromes
                      1. Sensing Blue and UV-A Light
                        1. Role in De-etiolation
                          1. Role in Circadian Rhythms
                          2. Phototropins
                            1. Sensing Blue Light
                              1. Role in Phototropism
                                1. Role in Chloroplast Movement
                                2. UVR8
                                  1. Sensing UV-B Light
                                    1. Role in UV Protection
                                  2. Key Photomorphogenic Responses
                                    1. Seed Germination
                                      1. Light-Dependent Germination
                                        1. Phytochrome-Mediated Responses
                                        2. Skotomorphogenesis
                                          1. Etiolated Seedling Morphology
                                            1. Characteristics of Dark-Grown Plants
                                            2. De-etiolation
                                              1. Inhibition of Stem Elongation
                                                1. Promotion of Cotyledon Expansion
                                                  1. Chlorophyll Synthesis
                                                  2. Shade Avoidance Syndrome
                                                    1. Elongation of Stems and Petioles
                                                      1. Reduced Branching
                                                        1. Early Flowering
                                                          1. Changes in Leaf Angle and Size

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                                                      3. Photosynthesis

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                                                      5. Phototropism