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Plant Development and Morphogenesis Morphogenesis (Important Factors For…

- - - - Water
        
        in case of water scarcity, the plant triggers specific responses
        
        one of the most important component for plant development
      - Temperature
        
        suitable temperature is required for plant to grow
      - Light
        
        the duration of light gives information about the time of year
        
        light gradient- allows plant to grow or orient toward a bright region
        
        main factor for photosynthesis
      - Gravity
        
        advantageous for many plants
        
        orients themselves or their parts with respect to direction of gravity. example, apple hanging from apple tree
- - - - not oriented with regard to stimulus
      - based on changes on turgor pressure
      - stereotyped non-growth responses; by touch
    - - example:- gravimorphogenic responses formation of fibrous wood when stem or branch of plant is tilted & stressed by gravity
      - fundamental change occurs metabolism
      - cause a change in quality of the plant life
    - - negative tropism- growth away from stimulus
      - plagiotropism - growth at an angle
      - positive tropism- growth toward stimulus
      - thigmotropism- when touch is stimulus
      - growth responses oriented with regard to stimulus
      - chemotropism- chemical reaction; pollen tubes are sensitive towards chemical
    - - cell swims toward or away from stimulus
- - - - they are released into general circulation
      - when appropriate stimulus occur, hormones are released for transport through either phloem or mesophyll and cortex cells
      - synthesized or stored in regions of transduction
      - plant communication by slow mechanism; transport byhormones
      - different types of plant hormones
        
        cytokinins
        
        gibberellins
        
        auxins
        
        abscisic acid
        
        ethylene
        
        jasmonic acid
        
        several others
- - - - the length of time stimulus must be present for perspective cells to react & complete transduction
    - - the level of stimulus that must be present during presentation time to cause perception & transduction