Summary
Transformation of potato (Solanum tuberosum L.) with cysteine proteinase inhibitor (PI) genes represents a potential way of controlling the major insect pest Colorado potato beetle (CPB; Leptinotarsa decemlineata Say). The present study describes the Agrobacterium-mediated transformation of potato (cv. Kennebec) with an oryzacystatin I (OCI) cDNA clone linked to a CaMV 35S promoter. The transgenic plants accumulated active OCI in potato leaves, as demonstrated by the papain-inhibitory activity of transgenic plant leaf extracts. In addition to their anti-papain activity, the extracts also caused a partial but significant inhibition of CPB digestive proteinases, similar to that observed with pure inhibitors. Recombinant OCI did not alter the activity of the major potato leaf endogenous proteinases, which seemed to be of the serine-type. Therefore we suggest that the OCI cDNA can be used for the production of CPB-resistant transgenic potato plants without interfering with endogenous proteinases of these plants.
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Abbreviations
- CPB:
-
Colorado potato beetle
- E-64:
-
trans-epoxy-succinyl-L-leucylamido (4-guanidino) butane
- OCI:
-
oryzacystatin I
- PI:
-
proteinase inhibitor
- PMSF:
-
phenylmethylsulfonyl fluoride
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Communicated by C.F. Quiros
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Benchekroun, A., Michaud, D., Nguyen-Quoc, B. et al. Synthesis of active oryzacystatin I in transgenic potato plants. Plant Cell Reports 14, 585–588 (1995). https://doi.org/10.1007/BF00231943
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DOI: https://doi.org/10.1007/BF00231943