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Transgenic indica rice plants harboring a synthetic cry2A* gene of Bacillus thuringiensis exhibit enhanced resistance against lepidopteran rice pests

Transgenic indica rice plants harboring a synthetic cry2A* gene of Bacillus thuringiensis exhibit... A novel synthetic cry2A* gene was introduced into the elite indica rice restorer line Minghui 63 by Agrobacterium -mediated transformation. A total of 102 independent transformants were obtained. Among them, 71 transformants were positive cry2A* plants according to PCR analysis. Four highly insect-resistant lines with single-copy insertion (designated as 2A-1, 2A-2, 2A-3, and 2A-4) were selected based on field assessment and Southern blot analysis in the T 1 generation. All four transgenic lines showed Mendelian segregation by seed germination on 1/2 MS medium containing Basta. Homozygous transgenic plants were selected according to germination ratio (100%) in the T 2 generation. Cry2A* protein concentrations were determined in homozygous transgenic lines, their derived hybrids, and their backcross offspring. The Cry2A* protein concentrations of four homozygous transgenic lines ranged from 9.65 to 12.11 μg/g of leaf fresh weight. There was little variation in the hybrids and backcross offspring. Insect bioassays were conducted in both the laboratory and field. All four transgenic lines were significantly resistant to lepidopteran rice pests. These cry2A* transgenic lines can be used to produce insect-resistant hybrids and serve as a resistant source for the development of two-toxin Bt rice. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png TAG Theoretical and Applied Genetics Springer Journals

Transgenic indica rice plants harboring a synthetic cry2A* gene of Bacillus thuringiensis exhibit enhanced resistance against lepidopteran rice pests

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References (37)

Publisher
Springer Journals
Copyright
Copyright © 2005 by Springer-Verlag
Subject
Life Sciences; Biotechnology; Biochemistry, general; Plant Biochemistry; Agriculture; Plant Genetics & Genomics; Plant Breeding/Biotechnology
ISSN
0040-5752
eISSN
1432-2242
DOI
10.1007/s00122-005-0062-8
pmid
16187120
Publisher site
See Article on Publisher Site

Abstract

A novel synthetic cry2A* gene was introduced into the elite indica rice restorer line Minghui 63 by Agrobacterium -mediated transformation. A total of 102 independent transformants were obtained. Among them, 71 transformants were positive cry2A* plants according to PCR analysis. Four highly insect-resistant lines with single-copy insertion (designated as 2A-1, 2A-2, 2A-3, and 2A-4) were selected based on field assessment and Southern blot analysis in the T 1 generation. All four transgenic lines showed Mendelian segregation by seed germination on 1/2 MS medium containing Basta. Homozygous transgenic plants were selected according to germination ratio (100%) in the T 2 generation. Cry2A* protein concentrations were determined in homozygous transgenic lines, their derived hybrids, and their backcross offspring. The Cry2A* protein concentrations of four homozygous transgenic lines ranged from 9.65 to 12.11 μg/g of leaf fresh weight. There was little variation in the hybrids and backcross offspring. Insect bioassays were conducted in both the laboratory and field. All four transgenic lines were significantly resistant to lepidopteran rice pests. These cry2A* transgenic lines can be used to produce insect-resistant hybrids and serve as a resistant source for the development of two-toxin Bt rice.

Journal

TAG Theoretical and Applied GeneticsSpringer Journals

Published: Nov 1, 2005

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