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  • 1
    Electronic Resource
    Electronic Resource
    Microsurgical removal of epidermal and cortical cells: evidence that the gravitropic signal moves through the outer cell layers in primary roots of maize (1990)
    Springer
    Planta 180 (1990), S. 530-536 
    Details
    ISSN: 1432-2048
    Keywords: Auxin and gravitropism ; Gravitropism (signal transmission ; Root (gravitropism) ; Zea (gravitropism)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract There is general agreement that during root gravitropism some sort of growth-modifying signal moves from the cap to the elongation zone and that this signal ultimately induces the curvature that leads to reorientation of the root. However, there is disagreement regarding both the nature of the signal and the pathway of its movement from the root cap to the elongation zone. We examined the pathway of movement by testing gravitropism in primary roots of maize (Zea mays L.) from which narrow (0.5 mm) rings of epidermal and cortical tissue were surgically removed from various positions within the elongation zone. When roots were girdled in the apical part of the elongation zone gravitropic curvature occurred apical to the girdle but not basal to the girdle. Filling the girdle with agar allowed curvature basal to the girdle to occur. Shallow girdles, in which only two or three cell layers (epidermis plus one or two cortical cell layers) were removed, prevented or greatly delayed gravitropic curvature basal to the girdle. The results indicate that the gravitropic signal moves basipetally through the outermost cell layers, perhaps through the epidermis itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411451
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inhibition of polar calcium movement and gravitropism in roots treated with auxin-transport inhibitors (1984)
    Springer
    Planta 160 (1984), S. 536-543 
    Details
    ISSN: 1432-2048
    Keywords: Allium ; Calcium and gravitropism ; Morphactin ; Naphthylphthalamic acid ; Pisum (gravitropism) ; 2,3,5-Triiodobenzoic acid ; Zea (gravitropism)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Primary roots of maize (Zea mays L.) and pea (Pisum sativum L.) exhibit strong positive gravitropism. In both species, gravistimulation induces polar movement of calcium across the root tip from the upper side to the lower side. Roots of onion (Allium cepa L.) are not responsive to gravity and gravistimulation induces little or no polar movement of calcium across the root tip. Treatment of maize or pea roots with inhibitors of auxin transport (morphactin, naphthylphthalamic acid, 2,3,5-triiodobenzoic acid) prevents both gravitropism and gravity-induced polar movement of calcium across the root tip. The results indicate that calcium movement and auxin movement are closely linked in roots and that gravity-induced redistribution of calcium across the root cap may play an important role in the development of gravitropic curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411142
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    Paper (German National Licenses)
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