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Related Experiment Videos

Plastic responses of leaves.

J E Dale

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

    Plant leaves show adaptable growth (plasticity) in shape and size. Compensatory growth after leaf removal occurs via increased cell size, not cell number, highlighting early developmental plasticity.

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    Area of Science:

    • Plant Biology
    • Developmental Biology
    • Plant Physiology

    Background:

    • Leaves exhibit remarkable plasticity in shape and size during development.
    • Leaf form variations are often linked to size changes, but not always vice versa.
    • Plastic responses in leaf morphology originate early in primordial development.

    Purpose of the Study:

    • To investigate the mechanisms underlying plastic responses in leaf shape and size.
    • To analyze compensatory growth effects in Phaseolus vulgaris primary leaves after partial defoliation or decapitation.
    • To understand the role of cell division, expansion, and cell wall properties in leaf plasticity.

    Main Methods:

    • Observation of plastic responses in leaf shape and size during development.
    • Experimental manipulation of Phaseolus vulgaris, including leaf removal and stem decapitation.
    • Analysis of cell number and cell size to determine growth mechanisms.
    • Assessment of cell wall extensibility and turgor-wall yield stress.

    Main Results:

    • Compensatory leaf growth in Phaseolus vulgaris results from increased mean cell size, not cell number.
    • Cell wall extensibility is not significantly altered by treatments.
    • Rapid compensatory growth suggests a role for increased turgor-wall yield stress.

    Conclusions:

    • Leaf systems are valuable models for studying plasticity in shape and size.
    • Early developmental stages are critical for initiating plastic responses in leaf form.
    • Further research into cell wall development is crucial for understanding leaf plasticity.

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