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Title: Studies in the growth and respiration of root tissue, with particular reference to auxin action
Author: Garrard, Anne
Awarding Body: University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1951
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The "growth process" which takes place in plant cells is a complex series of events and has been studied as a whole from the earliest times. While these studies have yielded most valuable data for the total functioning of plant processes, more recent studies have been directed towards particular aspects of the whole process of growth. When attention is directed towards the "growth” of a stem or root apex, it is evident that three phases take place in sequence from the tip. The cells are at first meristematic, actively dividing and characterised by high protoplasmic and protein content and the presence of very small vacuoles.(Bailey, 1930; Zirkle, 1932) When these cells have ceased to divide they undergo rapid elongation involving both rapid water uptake and rapid extension of the cell wall. Cell-wall extension, according to Burstrom (1941, 1942), takes place in two stages. Firstly the cell-wall stretches (due to increased swelling of intermiceliar colloids) and secondly new micelles are interspersed among already existing ones by intussusception. The second stage of the elongating phase accounts for two thirds of the "stretching growth". The main characteristic of this period is the increased vacuolation of these cells which is accompanied by increase in protein nitrogen and in dry weight (Brown and Broadbent, 1951) Maturation of these 2 cells takes place subsequent to elongation or may even begin before it is completed thus terminating the latter process.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Plant Sciences