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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Basu, D. Das, S. Ghosh, D. Ramakrishnan, N. A. Ghosh, M. Sen, S. K. Nayak, P. Basu, A. |
| Description | Author Affiliation: Nayak P ( Plant Molecular and Cellular Genetics Section and Centre for Plant Molecular Biology, Bose Institute, Calcutta, India.); |
| Abstract | Generation of insect-resistant, transgenic crop plants by expression of the insecticidal crystal protein (ICP) gene of Bacillus thuringiensis (Bt) is a standard crop improvement approach. In such cases, adequate expression of the most appropriate ICP against the target insect pest of the crop species is desirable. It is also considered advantageous to generate Bt-transgenics with multiple toxin systems to control rapid development of pest resistance to the ICP. Larvae of yellow stem borer (YSB), Scirpophaga incertulas, a major lepidopteran insect pest of rice, cause massive losses of rice yield. Studies on insect feeding and on the binding properties of ICP to brush border membrane receptors in the midgut of YSB larvae revealed that cryIAb and cryIAc are two individually suitable candidate genes for developing YSB-resistant rice. Programs were undertaken to develop Bt-transgenic rice with these ICP genes independently in a single cultivar. A cryIAc gene was reconstructed and placed under control of the maize ubiquitin 1 promoter, along with the first intron of the maize ubiquitin 1 gene, and the nos terminator. The gene construct was delivered to embryogenic calli of IR64, an elite indica rice cultivar, using the particle bombardment method. Six highly expressive independent transgenic ICP lines were identified. Molecular analyses and insect-feeding assays of two such lines revealed that the transferred synthetic cryIAc gene was expressed stably in the T2 generation of these lines and that the transgenic rice plants were highly toxic to YSB larvae and lessened the damage caused by their feeding. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 6 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bacillus Thuringiensis Bacterial Proteins Biosynthesis Bacterial Toxins Endotoxins Genes, Synthetic Lepidoptera Pathogenicity Oryza Sativa Genetics Pest Control, Biological Plants, Genetically Modified Animals Chemistry DNA Primers Hemolysin Proteins Molecular Sequence Data Polymerase Chain Reaction Recombinant Proteins Restriction Mapping Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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