Abstract
In order to optimize tissue culture conditions for genetic transformation of zoysiagrass (Zoysia japonica Stued.), the effect of plant growth regulators and culture medium supplements on embryogenic callus induction from mature seeds of a cultivar `Zenith` were investigated. The optimal concentration and treatment period of NaOCl is 30% (v/v) for 60 minutes. Cultivation of mature seed on the callus Induction medium containing 3 mg/L 2,4-D and 3 mg/L dicamba showed 17.5% of embryogenic callus formation frequency. Supplementation of 1 g/L casein hydrolysate and 500 mg/L L-proline improved frequency of embryogenic callus induction. Audition of the medium with 5 mg/L and 20 mg/L cysteine enhanced frequencies of embryogenic callus induction. Efficient callus induction system established in this study will be useful for molecular breeding of Boysiagrass through genetic transformation.
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