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Development and Morphogenesis (Communication within the plant (Perception…
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Taxis:
- a response in which a cell swims toward or away from a stimulus.
Gibberellins
- at least 125 of them are known, and rather than being named, they are just numbered: GA1, GA2,....GA123
Light is the stimulus in phototropism; therefore , a pigment is needed, and its absorption spectrum must match the action spectrum.
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Besides energy for photosynthesis, light also provides two important types of information about the environment:
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- selectively advantageous for many plants to orients themselves or their parts with respect to direction of gravity
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- Although plants do not move around like animals, their parts frequently grow against objects and respond to this contact.
- fluctuates in a predictable pattern on both a daily and a yearly basis.
- it is sometimes called morphogenetic response, it causes a change in the "quality" of the plant.
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- are too dense to float in cytoplasm.
- is the length of time the stimulus must be present for the perceptive cells to react and complete transduction.
- their addition to a tissue culture medium containing auxin and sugar stimulates cell division-cytokinesis.
- the second site of response to apically produced auxin is the buds located in leaf axils; their response is not cell elongation but rather inhibition of growth.
In cells of the young internodes just below the apical meristem, auxin triggers cell elongation.
- stimulated chlorophyll and carotenoid synthesis causing opening of stomata at dawn.
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- Juvenile phase: when plants are incapable of being induced to flower
- Adult phase: when they are sensitive to floral stimuli.
- Phase change: the conversion from juvenile to adult phase.
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- plants contain endogenous rythms; that is, certain aspects of their metabolism cycle repeatedly between two states, the cycle in controlled by internal factors.
