Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.662994
Title: The cellular and physiological basis for the effects of the Rht3 allele on shoot development in near-isogenic lines of wheat (Triticum aestivum L.)
Author: Tonkinson, Claire L.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1992
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Abstract:
The aim of this study was to identify the cellular and physiological mechanism(s) for the action of the Rht3 (dwarfing) allele in near-isogenic lines of wheat (Triticum aestivum L. cv Maris Huntsman). The Rht3 allele did not affect the rate of initiation, or total number, of new leaf primordia and therefore stem internodes, formed by the shoot apex. The first observable effect of the Rht3 allele was to reduce stem internode lengths, compared to those in the rht3 wild-type, beginning ca 15 d after sowing. The second leaf (L2) was chosen as the model system in which to investigate the cellular basis for the effects of the Rht3 allele. The Rht3 allele did not reduce the maximum relative elemental growth rate (REGR) in L2 grown at 20oC compared to the rht3 wild-type or the distance from the leaf base at which this was achieved. However, distal to the position of maximum REGR within the L2 extension zone the Rht3 allele significantly reduced both the REGR and the rate of cell extension compared to the rht3 wild-type. At 20oC, the Rht3 allele reduced the length of the L2 extension zone from ca 20 mm to ca 13mm. The Rht3 allele reduced both the rate of cell extension and final epidermal cell length, but did not cause any significant reduction in total cell number. In the rht3 wild-type the length of the extension zone could be modified by the application of growth regulators, GA3, 2S, 3S paclobutrazol and/or growth at 10oC. However, the Rht3 mutant allele could be mimicked in the rht3 wild-typeby the application of 2S, 3S paclobutrazol and/or growth at 10oC.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.662994  DOI: Not available
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