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Title: Studies on the root cap and its significance in graviperception
Author: Shachar, Bruria
Awarding Body: University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1967
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The role of the root cap in graviperception was studied in root tips of Maize seedlings. It was shown that destarching and removal of the root cap causes the lose of geotropic reaction in the roots. The normal growth of the roots is not affected by this decapping and the roots regenerate their root caps during 36 hours. Geotropic reactivity reappears before the completion of regeneration and a study of recovery time was made. A relationship between the length of the roots at decapping time and the length of recovery period was found. Presentation time studies of normal roots and roots which were decapped after stimulation indicate that the root cap can be removed after stimulation without influencing the subsequent response. It was also shown that the stimulus must be transmitted within the presentation time and that the plasmatic connections between the cap and the root are necessary for this transmission. The structural state of the root cap at recovery time was investigated with the Electron Microscope and the presence of starch grains shown. The results of this work are discussed in the light of the current theories on graviperception.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Botany