Factors that Affect Plant Growth
Internal Factors
Internal Factors
• Influence growth • Are found within the organism
Remember?• Human growth can be affected by internal
factors like human growth hormone.• What is an internal factor that you think might
affect plant growth?
Plant Hormones
• Auxins• Cytokinins• Gibberellins• Abscisic Acid (ABA)• Ethene
Cytokinins
Gibberellins
• Similar to auxins, but the mechanisms of action are not fully understood by researchers!
Abscisic Acid (ABA)
Ethene (Ethylene)
• Effect of ethylene gas on fruit ripening• Tomato ripening experiment
Review: Internal Factors
• Auxins• Cytokinins• Gibberellins• Abscisic Acid (ABA)• Ethene