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Increasing of kappa (κ)-carrageenan content in Kappaphycus alvarezii seaweed is potentially be achieved by applying transgenesis technology. This study was performed to obtain a construction of  κ-Carrageenase gene and A grobacterium tumefaciens to carry those construction genes.  The κ-Carrageenase (κ-Car) gene was involved in κ-carrageenan biosynthesis. The κ-Car gene sequence was ligated between the 35S CaMV promoter and tNos terminator sequences to generate pMSH/κ-Car expression vector. Transformation of pMSH/κ-Car plasmid to Escherichia coli was performed by heat-shock method, and to Agrobacterium tumefaciens by tri-parental mating method. The results showed that several colonies of E . coli and A . tumefaciens grew in the selective culture mediums containing antibiotic . PCR analysis using primers 35S-Forward and tNos -Reverse with DNA template from those bacterial colonies resulted DNA fragment of about 2,000 bp, the same as the total length of 35S CaMV promoter, κ-Car gene and tNos terminator sequences. Therefore, the construction of pMSH/κ-Car gene was succeeded and a colony of A . tumefaciens transformant carrying pMSH/κ-Car plasmid was successfully produced. Keywords:  A grobacterium tumefaciens , k appa ( κ ) -Carrage e nase gene , t ransgenesis , vector

BINARY VECTOR CONSTRUCTION OF KAPPA(κ)-CARRAGEENASE GENE AND TRANSFORMATION TO Agrobacterium tumefaciens AS MEDIATOR FOR SEAWEED TRANSGENIC GENERATION