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Physiology of movements in stems of seedling pisum sativum cultivar alaska 2. the role of the apical hook and of auxin in nutation



Physiology of movements in stems of seedling pisum sativum cultivar alaska 2. the role of the apical hook and of auxin in nutation



Plant Physiology (Rockville) 70(5): 1401-1404



The relationship between the apical hook and stem nutation is etiolated Alaska pea (P. sativum L. cv Alaska) seedlings was explored. The hook and maximum nutational displacement have the same plane of symmetry, and both are affected by light acting through phytochrome. The 2 processes do not appear to be obligatorily coupled. Light effects on nutation involve at least 2 components, an increase in amplitude as well as an increase in frequency. These components can be separated from one another on the basis of developmental time course or red light fluence. Excision of the plumule, leaving the hook attached to the stem, inhibits photostimulated nutation. This inhibition can be overcome by application of IAA to the remaining stem. If the hook is also excised, then nutation in the stem cannot be restored by IAA. It is possible, although not yet proven, that the oscillatory process regulating nutation in the stem is itself localized in the hook and that rhythms in the transport of IAA are involved.

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