Plant Physiology Notes

📘 Plant Physiology Notes (2026–2027 Edition)

Plant Physiology Notes (2026–2027 Edition) is a comprehensive textbook designed for BS students, educators, and researchers in botany, plant sciences, and biotechnology. This book provides a detailed understanding of plant functions including water relations, mineral nutrition, photosynthesis, respiration, growth regulation, metabolism, plant movements, and biotechnology applications.

This book connects theoretical knowledge with practical applications in agriculture, plant biotechnology, and environmental science. It helps students understand how plants grow, develop, respond to environmental factors, and contribute to global ecosystems.

🌱 Unit 1: Introduction to Plant Physiology
• Scope and importance of plant physiology
• Historical perspectives in plant physiology
• Relation of plant physiology with other sciences
• Levels of organization in plants
• Experimental approaches in plant physiology

💧 Unit 2: Plant Water Relations
• Water potential and its components
• Absorption and movement of water in plants
• Transpiration and its regulation
• Mechanism of stomatal movement
• Antitranspirants and adaptations to water stress

🌾 Unit 3: Mineral Nutrition in Plants
• Essential elements and their classification
• Criteria of essentiality of mineral elements
• Functions of macronutrients and micronutrients
• Deficiency symptoms in plants
• Hydroponics and nutrient solution culture
• Mechanisms of ion absorption and transport

☀️ Unit 4: Photosynthesis
• Chloroplast structure and pigments
• Light reactions and electron transport chain
• Photophosphorylation (cyclic and non-cyclic)
• Calvin cycle and carbon fixation pathways
• C4 and CAM photosynthesis
• Photorespiration and its significance
• Factors affecting photosynthesis

⚡ Unit 5: Respiration in Plants
• Glycolysis and fermentation
• Krebs cycle and oxidative decarboxylation
• Electron transport chain and oxidative phosphorylation
• Respiratory quotient and its significance
• Alternate pathways of respiration
• Factors affecting respiration

🌿 Unit 6: Nitrogen Metabolism
• Nitrogen cycle and biological nitrogen fixation
• Symbiotic and non-symbiotic nitrogen fixation
• Nitrate and ammonium assimilation
• Enzymes involved in nitrogen metabolism
• Importance of nitrogen metabolism in plants

🌳 Unit 7: Plant Growth and Development
• Growth and differentiation
• Phases and measurement of growth
• Photomorphogenesis and etiolation
• Apical dominance and senescence
• Seed dormancy and germination
• Leaf abscission and flowering

🌸 Unit 8: Plant Hormones and Growth Regulators
• Discovery and classification of phytohormones
• Auxins: biosynthesis, transport, and physiological effects
• Gibberellins and their role in growth
• Cytokinins and their role in cell division
• Abscisic acid and its functions
• Ethylene and its physiological effects
• Synthetic growth regulators and practical applications

🌻 Unit 9: Plant Movements and Responses
• Tropisms: phototropism, geotropism, hydrotropism, thigmotropism
• Nastic movements: seismonasty, photonasty, nyctinasty
• Mechanism of movement in plants
• Plant responses to light, temperature, and gravity
• Stress physiology and adaptations

🧪 Unit 10: Secondary Metabolites and Plant Defense
• Alkaloids, terpenoids, and phenolics
• Biosynthesis of secondary metabolites
• Role of secondary metabolites in plant defense
• Medicinal and economic importance of secondary metabolites

🧬 Unit 11: Plant Biotechnology and Applied Physiology
• Tissue culture techniques
• Micropropagation and somaclonal variation
• Genetic engineering in plants
• Stress tolerance through biotechnology
• Applications of plant physiology in agriculture

This app is inspired by the authors:
Lincoln Taiz, Eduardo Zeiger, and Frank B. Salisbury.

📲 Download Plant Physiology Notes (2026–2027 Edition) to understand plant growth, metabolism, environmental responses, and modern biotechnology applications in plant science.