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construction of RNAi expression vectors by Fusion gene fragments of gbss,ssⅢ and ssⅡ from potato |
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Abstract Granule-bound starch synthase and soluble starch synthase are the key enzymes in starch synthesis. Their activity would decide starch quality via affecting the chain length, the ratio of amylose content to amylopectin and the structure of starch. We performed homology analysis on gbss, ssII and ssIII with software Blast and DNAStar followed by using 261bp fragments from gbss(1~261),244bp fragments from ssⅢ(2164~2407)and 281 bp fragments from ssⅡ(161~441)to make the fusion gene gbs3s2 with overlap PCR. Then we constructed the promoter CaMV 35S driven, containing 'forward gbs3s2 fusion fragments-reverse pdk intron-reverse gbs3s2 fusion fragments', plant siRNA expression vector, which lay the foundation for breeding a low gelatinization temperature potato.
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Received: 10 March 2008
Published: 25 August 2008
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