Plant physiology plant life cycle

PLANT PHYSIOLOGY Faculty of Biology Hanoi University of Sciences – VNU 2014 Cyclical process Reproductive development Vegetative development Embryogenesis Plant life cycle Germination What are factors? Cold >< Warm Moist >< Dry Dark >< Light Seed structure Germination Epigeous Hypogeous What kinds of phytohormones affect germination? Photomorphogenesis Seedlings grow up Growth Changes in size and mass Number of cells Volume and mass of cells Size and mass of organs Dry weight Plant growth is affected by many factors External factors Growth Internal factors Reproductive Development Flowering How plants know it is the right time to start reproductive development? Regulatory pathways of flowering in Arabidopsis Photoperiodism Phytochrome – “light sensor” Red: 670nm Far red: 730nm cis trans The synthesis and action of Pr-Pfr The expression of flowering control genes Vernalization Florigen – a theoritical hormone Pollination and Embryogenesis What condition? Fertilization Embryogenesis Fruit Development By insects By wind By water … Which regulators? Fertilization Embryogenesis Fruit Development Cell division Embryogenesis and endosperm Fruit growth Ripening Fruit ripening Some processes in fruit ripening Senescense Progres -sive Top Overall Deciduous Cell death occurs in almost all plant cells and tissues ...Cyclical process Reproductive development Vegetative development Embryogenesis Plant life cycle Germination What are factors? Cold >< Warm Moist >< Dry Dark >< Light Seed structure... Size and mass of organs Dry weight Plant growth is affected by many factors External factors Growth Internal factors Reproductive Development Flowering How plants know it is the right time to... in fruit ripening Senescense Progres -sive Top Overall Deciduous Cell death occurs in almost all plant cells and tissues