Taiz and Zeiger – Chapter 16, Smith et al. – Chapter 5 Fertilization, Embryogenesis & Vegetative Development HORT 301 – Plant Physiology August 30, 2010 Taiz and Zeiger – Chapter 16, Smith et al. – Chapter 5 paul.m.hasegawa.1@purdue.edu Seed plants have similar growth and development patterns These patterns are modulated by the environment
Basic plant development stages - embryogenesis, and vegetative and reproductive growth/development
Pollination and fertilization Hartmann et al. Plant Propagation 2002
Graham et al. 2006, Plant Biology Embryogenesis – zygote to seed Graham et al. 2006, Plant Biology
Stages of embryogenesis Plant Biology (2010) Smith et al
Auxin – a primary regulator embryogenesis Auxin movement and accumulation establishes polarity that regulates embryonic patterning
Apical-basal axis patterning during embryogenesis – genes involved in longitudinal development
Radial patterning during embryogenesis Plant Biology (2010) Smith et al
scr Radial patterning genetic determinants SCARECROW (SCR) and SHORTROOT (SHR) regulate endodermal and cortical development WOODEN LEG (WOL) regulates protophloem development scr
Seed development/dormancy and germination – interplay of ABA and GA Smith et al. (2010) Plant Biology Plant Biology (2010) Smith et al
Repeated unit is leaf, lateral meristem and internode Shoot apical meristem (SAM) - progenitor of the repeated unit of the shoot Repeated unit is leaf, lateral meristem and internode Smith et al. (2010) Plant Biology Plant Biology (2010) Smith et al
Polar auxin transport and shoot elongation Smith et al. (2010) Plant Biology Plant Biology (2010) Smith et al
Lateral bud suppression reduces branching in tomato and maize Genetic determinants and hormones regulate axillary bud development teosinte branched 1 lateral suppressor Smith et al. (2008) Plant Biology Plant Biology (2010) Smith et al.
Leaf meristem has three developmental axes Apical-basal, lateral, and upper (adaxial) and lower (abaxial)
Vertical and horizontal leaf growth Smith et al. (2010) Plant Biology Plant Biology (2010) Smith et al
Auxin and root apical meristem cell identity and root development Genetic determinants
Root apical meristem and zonation Smith et al. Plant Biology (2010)
Lateral root branching – differentiation from the pericycle
Senescence and programmed cell death are an aging process Soybean plants are similar age but flowers were removed from the plant on the right