Abstract
Rice, the major food crop of world is severely affected by homopteran sucking pests. We introduced coding sequence of Allium sativum leaf agglutinin, ASAL, in rice cultivar IR64 to develop sustainable resistance against sap-sucking planthoppers as well as eliminated the selectable antibiotic-resistant marker gene hygromycin phosphotransferase (hpt) exploiting cre/lox site-specific recombination system. An expression vector was constructed containing the coding sequence of ASAL, a potent controlling agent against green leafhoppers (GLH, Nephotettix virescens) and brown planthopper (BPH, Nilaparvata lugens). The selectable marker (hpt) gene cassette was cloned within two lox sites of the same vector. Alongside, another vector was developed with chimeric cre recombinase gene cassette. Reciprocal crosses were performed between three single-copy T0 plants with ASAL- lox-hpt-lox T-DNA and three single-copy T0 plants with cre-bar T-DNA. Marker gene excisions were detected in T1 hybrids through hygromycin sensitivity assay. Molecular analysis of T1 plants exhibited 27.4% recombination efficiency. T2 progenies of L03C04(1) hybrid parent showed 25% cre negative ASAL-expressing plants. Northern blot, western blot and ELISA showed significant level of ASAL expression in five marker-free T2 progeny plants. In planta bioassay of GLH and BPH performed on these T2 progenies exhibited radical reduction in survivability and fecundity compared with the untransformed control plants.
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Abbreviations
- ANOVA:
-
Analysis of variance
- ASAL:
-
Allium sativum agglutinin from leaf
- BPH:
-
Brown planthopper
- ELISA:
-
Enzyme-linked immunosorbent assay
- GLH:
-
Green leafhopper
- PCR:
-
Polymerase chain reaction
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Acknowledgments
The authors are grateful to Department of Biotechnology, Government of India for financial contributions and Bose Institute, Kolkata, India for providing infrastructure to carry out the work. The authors are also thankful to Regional Rice Research Station, Chinsurah, West Bengal, India, for providing seed stock of IR64 rice cultivar.
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Communicated by L. Jouanin.
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ESM_2 PCR analysis of T
3 progenies homozygous forASALgene Nineteen T3 progenies of L03C04(1) 01 parent showed presence of 0.362 kb amplicons for the presence of ASAL coding gene using gene-specific primer pairs F1/R1. Lane ‘-’ represents DNA from untransformed rice plant as negative control. Lane M, DNA molecular weight marker (Generuler TM, MBI Fermentas,uk) Supplementary material 2 (TIFF 842 kb)
ESM_1 Hygromycin sensitivity assay of T
1 hybrid lines (a) germinating T1 seeds in medium without hygromycin. (b)Untransformed control seeds in germination media with hygromycin 50 mg l−1, (c) T1 seeds of L03C04 hybrid (d) T1 seeds of L04C06 hybrid and (e) T1 seeds of L07C09 hybrid in germination medium supplemented with 50 mg l−1 hygromycin Supplementary material 1 (TIFF 2999 kb)
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Sengupta, S., Chakraborti, D., Mondal, H.A. et al. Selectable antibiotic resistance marker gene-free transgenic rice harbouring the garlic leaf lectin gene exhibits resistance to sap-sucking planthoppers. Plant Cell Rep 29, 261–271 (2010). https://doi.org/10.1007/s00299-010-0819-7
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DOI: https://doi.org/10.1007/s00299-010-0819-7