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Development and Morphogenesis (Environmental Complesity (Temperature…
Development and Morphogenesis
Morphogenesis
Formation of the shape of the plants and its various organs.
Symmetry
The quality of being made up of exactly similar parts facing each other or around an axis.
Phyllotaxy
Alternate
Opposite
Differentiation
An increase in complexity as some cells become different from eachother.
Polarity
The formation of root axis
The formation of shoot axis
Responding to environmental stimuli
Morphogenic responses
Taxis
Nastic responses
Tropic responses
Environmental Complesity
Temperature
Thermotropism
Touch
Thigmotropism
Gravity
Gravitropism
Water
Hydrotropism
Light
Phototropism
Communication with in the plant
Chemical Messengers
Perception and transduction
Within Limited region of the body.
Organelles must communicate with eachother.
Three stages of communication
Transduction
Information must be transduced.
Changed to a form that can be either acted upon or transported.
Response
Differentiation
Dormancy
Growth
Flower production
Examples
Change in the type of leaf.
Preception
Temperature
Moisture
Plants must perceive environmental cue.
Day light
Activation and inhibition of shoots by auxin.
Cell Elongaton
Apical Dominance
Differentiation of vascular tissues.
auxins
shoot apical meristems produce the auxin IAA
movement through phloem and by polar transport
Movement of auxin by polar transport
From cell-to-cell is facilitated by carrier proteins
Auxin Responses :
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Hormones as a signal of environmental factors.
Tropisms
Leaf Abscission
Flowering
Endogenous rhythm and flowering
ABC model of flower organizaton.
Photo periodic induction to flower.
Ripeness to flower.
What cause tree to grow straight up
Negative gravitropism
Positive phototropism
Symmetry
Plagiotropism
Growth Responses
positive tropism- growth toward the stimulus
negative tropism- growth away from the stimulus
tropic responses- growth responses oriented with regard to the stimulus
plagiotropism- growth at an angle
