AbstractThe debate about whether gravity sensing relies upon statoliths (amyloplasts that sediment) has intensified with recent findings of gravitropism in starchless mutants and of claims of hydrostatic gravity sensing. Starch and significant plastid sedimentation are not necessary for reduced sensing in mutant roots, but plastids might function here if there were a specialized receptor for plastid mass e.g. in the ER. Alternatively, components in addition to amyloplasts might provide mass for sensing. The nucleus is dense and its position is regulated, but no direct data exist for its role in sensing. If the weight of the protoplast functioned in sensing, why would there be specific cytological specializations favoring sedimentation rather than cell mass? Gravity has multiple effects on plants in addition to gravitropism. There may be more than one mechanism of gravity sensing.


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    Title :

    Cell biology of plant gravity sensing


    Contributors:
    Sack, F.D. (author)

    Published in:

    Advances in Space Research ; 14 , 8 ; 117-119


    Publication date :

    1994-01-01


    Size :

    3 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Cell Biology of Plant Gravity Sensing

    Sack, F. D. / COSPAR; Interdisciplinary Scientific Commission F | British Library Conference Proceedings | 1994





    Gravity Sensing in Cells

    Sievers, A. / Buchen, B. / Hodick, D. | British Library Online Contents | 1996