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Characterization of Two Auxin-Induced Acc Synthase Genes in Tomatoes: (English)

Characterization of Two Auxin-Induced Acc Synthase Genes in Tomatoes: (English)

          
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About the Book

This dissertation, "Characterization of Two Auxin-induced ACC Synthase Genes in Tomatoes" by Ching-man, Leung, 梁靜雯, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled CHARACTERIZATION OF TWO AUXIN-INDUCED ACC SYNTHASE GENES IN TOMATOES Submitted by Leung Ching Man for the degree of Master of Philosophy at The University of Hong Kong in November 2005 Ethylene is the simplest unsaturated hydrocarbon involved in many physiological activities, including seed germination and fruit ripening. Ethylene is also involved in many biotic and abiotic stress responses, such as wounding and flooding. 1-Aminocyclopropane-1-carboxylic acid synthase (ACS) is the key regulatory enzyme in ethylene biosynthesis. Similarly to many other species, the ACS in tomatoes is encoded by a multigene family which consists of at least nine members (Le-ACS1A, Le-ACS1B, Le-ACS2, Le-ACS3, Le-ACS4, Le-ACS5, Le-ACS6, Le-ACS7, Le-ACS8), and each member expresses differentially in different tissues, under different stimuli and in different stages of developmental processes. In this study, two auxin-induced ACS genes in tomatoes, Le-ACS3 and Le-ACS5 were investigated. Expression analysis demonstrated that the expression of the two genes was in generally very low, however the expression of genes was detected by RT-PCR in young shoot, shoot apex and root where auxin levels are usually higher. The transcription of the two genes was shown to be independent to light conditions. In both dark and light grown seedlings, the time required for auxin-induced transcription was 30 minutes and 1hour for Le-ACS3 and Le-ACS5 respectively. In the shoot apex, the transcription of both genes was induced by indole-3-acetic acid but inhibited by abscisic acid. The increase under indole-3-acetic acid induction of Le-ACS5 was at a greater extent than that of Le-ACS3. Transgenic plants harboring antisense fragments of Le-ACS3 and Le-ACS5 driven by the Cauliflower Mosaic virus (CaMV) 35S promoter were generated. The silencing effects on the endogenous genes were shown in seedlings and suspension cell cultures in the transgenic lines, in which the normal gene transcripts were reduced to less than 50%. Physiological studies showed the transgenic lines were hypersensitive to the inhibitory effect of abscisic acid on seed germination, and the transgenes also affected the spatial formation of root primordia in epicotyl cuttings. This study has revealed some aspects of hormonal interactions, i.e., the effect of auxin and abscisic acid on ethylene biosynthesis by regulating the transcription of Le-ACS3 and Le-ACS5 in the shoot apex; and has enabled us to establish some insights on the nature of auxin-induced ethylene in relation to plant physiology. DOI: 10.5353/th_b3674884 Subjects: Plants - Effect of ethylene on Tomatoes - Genetics Ethylene - Synthesis Plant hormones


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Product Details
  • ISBN-13: 9781361422465
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 124
  • Spine Width: 7 mm
  • Width: 216 mm
  • ISBN-10: 1361422467
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Series Title: English
  • Weight: 304 gr


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