Wound-inducible expression of the Bacillus thuringiensis CrylB gene in transgenic rice
To investigate whether wound-induced production of Cry endotoxin protects transgenic rice against striped stem borer (SSB), we prepared constructs bearing a synthetic cry1B coding sequence controlled by the promoter region of either the constitutive maize ubiquitin gene or wound-inducible maize gene...
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Main Authors | , , , , , , , , , , , |
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Format | Publication |
Language | English |
Published |
Los Baños (Philippines)
International Rice Research Institute
2003
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Subjects | |
Online Access | Get more information |
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Summary: | To investigate whether wound-induced production of Cry endotoxin protects transgenic rice against striped stem borer (SSB), we prepared constructs bearing a synthetic cry1B coding sequence controlled by the promoter region of either the constitutive maize ubiquitin gene or wound-inducible maize genes - the maise proteinase inhibitor gene (mpi) and the hydroxyproline-rich glycoprotein (hrgp) gene. The mpi-cry1B-nos and Ubi-cry1B-nos gene cassettes on the one hand and the hrgp-cry1B-nos and Ubi-cry1B-nos gene cassettes on the other hand were cloned in pBKS+ vectors and pCAMBIA1300 binary vectors, respectively, for microprojectile bombardment- and Agrobacterium-mediated transformation of cv. Ariete. Accumulation of Cry1B from an undetectable level to 0.2% of total soluble protein, 8-12 h after mechanical wounding, was demonstrated in leaf and pith tissues of lines harboring the pmpi-cry1B construct. In these plants, Cry1B was not detected in pollen, endosperm, and embryo, unlike in pUbi-cry1B plants. Two out of 43 pmpi-cry1B plants were found to exhibit full protection against SSB damage. Seventeen and 66 plants harboring the Hrgp-cry1B and Ubi-cry1B T-DNA, respectively, were obtained through co-culture of embryogenic calli with strain EHA105. Some 58.8% and 42.2% of Hrgp-cry1B and Ubi-cry1B plants, respectively, accumulated Cry1B above 0.1% total soluble protein in leaf tissue. Wound-stimulated expression of cry1B was demonstrated in young leaf tissue of most Hrgp-cry1B plants. |
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Bibliography: | IRRI Library SB207 S9 G45 2003 F30 |