Abstract
Development of a large-scale transformation procedure is essential for generating T-DNA insertion lines and FOX libraries and for gene targeting studies. Suspension culture may be one of the best sources for producing a large number of transgenic cells; however, suspension-cultured cell clusters have been reported to have low Agrobacterium-mediated transformation frequencies in rice. In this investigation, we found that rice calli produce some unidentified substance critical for Agrobacterium-mediated transformation of rice that is released in the liquid culture media. By co-cultivating 3-day old suspension-cultured cells with Agrobacterium on filter paper moistened with enriched N6 media containing suspension-cultured cell media, more than 104 stable transformants were routinely obtained from 1 g of suspension-cultured cell clusters. Transformation efficiency was about 60-times higher than that obtained from calli co-cultured in N6 media alone. Also, judging from the average weight of the cell clusters, using suspension-cultured cell clusters resulted in about 10-fold enhancement of the transformation efficiency compared with that of calli subcultured on solid media.
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