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Cellular interactions in tissue and organ development.

T Sachs

    Symposia of the Society for Experimental Biology
    |January 1, 1986
    PubMed
    Summary
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    Plant development arises from complex interactions and internal programs. Key parameters like timing, specificity, and distance shape these interactions, influencing growth patterns and cell fates through hormonal feedback and local cell communication.

    Area of Science:

    • Developmental biology
    • Plant physiology

    Background:

    • Developmental patterns emerge from intricate interactions and intracellular programs.
    • Understanding these interactions is crucial for deciphering developmental processes.

    Purpose of the Study:

    • To define the roles and parameters (timing, specificity, distance) of interactions in development.
    • To outline major interaction systems controlling plant development.

    Main Methods:

    • Broad survey of information from diverse sources.
    • Analysis of evidence from normal and disturbed development (regeneration, grafts).

    Main Results:

    • Interactions occur over long distances (e.g., growing apices) and locally (e.g., plasmodesmata).
    • Hormonal feedback (auxins, cytokinins) and positive feedback loops regulate vascular differentiation and polarity.

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  • Interactions influence tissue/organ size and orientation rather than precise cell fate.

    • Conclusions:

    • Developmental interactions, though complex, follow predictable principles.
    • Interactions specify orientation and quantity, with gradual effects and feedback loops.
    • Growth factors play significant roles in cellular interactions, contributing to developmental plasticity.