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Related Experiment Videos

Control of shoot apical development via cell division.

R F Lyndon, M E Cunninghame

    Symposia of the Society for Experimental Biology
    |January 1, 1986
    PubMed
    Summary

    Plant cell division shapes plant form and organ initiation. Different division patterns in Pisum and Silene suggest separate controls for division plane and growth direction, highlighting the epidermis

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    Area of Science:

    • Plant developmental biology
    • Cellular morphogenesis
    • Meristematic growth dynamics

    Background:

    • Plant form is architecturally determined by cell division patterns.
    • Shoot apical meristem (SAM) shape and primordia formation are regulated by cell division rates and planes.
    • Species-specific variations exist in the mechanisms of leaf and flower initiation.

    Purpose of the Study:

    • To investigate the role of cell division plane and rate in plant organogenesis.
    • To explore the relationship between cell division, growth direction, and epidermal activity during primordium formation.
    • To differentiate the control mechanisms governing cell division and outward growth.

    Main Methods:

    • Comparative analysis of cell division patterns in Pisum and Silene during organ initiation.
    • Observation of periclinal divisions and their correlation with outward growth.
    • Inference of growth orientation based on cell division planes in the epidermis.

    Main Results:

    • Leaf initiation in Pisum primarily involves changes in periclinal division frequency, while Silene relies more on increased cell division rates.
    • Periclinal divisions may permit, rather than cause, primordium initiation, defining the potential area for formation.
    • Evidence suggests separate control of division plane and growth direction, with the epidermis playing a key role in initial outward growth.

    Conclusions:

    • The orientation of epidermal growth during primordium initiation differs between Pisum (longitudinal) and Silene (transverse).
    • The epidermis is crucial for initial stages of primordium formation, though division plane orientation may influence young leaf shape.
    • Further research is needed on the interplay between division planes, microtubules, microfibrils, and cellular interactions in apical growth.

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