The development of micropropagule and embryo of seaweed depend on nutrient and fertilizer used.Â Seaweed has been reported contain hormone regulators such as auxine, cytokinine, gibbereline, andÂ various minerals applied in stimulating the growth ocra plant and wheat culture. The objectives of thisÂ study were to determine the potential of Kappaphycus alvarezii extract and its optimal concentration inÂ accelerating of Kappaphycus alvarezii micropropagule and embryo growth. Micropropagule and embryoÂ produced through callus induction were planted into PES 1/20 liquid medium supplemented with seaweedÂ extract at the concentrations of 0 (control), 25, 50, 75, and 100 Î¼L in 10 mL of medium. The results showedÂ that medium enrichment with 50 Î¼L of seaweed extract had the highest survival rate and growth of thallus.Â In addition, this concentration was also resulted in a good performance of K. alvarezii thallus with theÂ lighter color. The advantage of this study for seaweed cultivation in Indonesia, among others, seaweed canÂ be used as fertilizer, especially in the maintenance of seaweed seed, so that cultivation can be betterÂ develop.
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