Influence of cultivar, season, explant type and seaweed concentrate on potato plantlet quality

The addition of a seaweed concentrate to tissue culture medium improved the quality of potato plantlets. Season, cultivar and explant type affected th e most beneficial concentration applied. Concentrations higher or lower tha n the optimum were less beneficial or adverse to plantlet quality. Terminal buds were more sensitive to non-optimum seaweed application than axillary buds. Decreased water loss from plantlets was one of the potential benefits of seaweed concentrate in vitro, thus improving establishment after transp lanting.