A fractional factorial experiment was carried out to understand germinating ecology of guarana(Paullinia cupana var. sorbilis),and to find out appropriate procedures for guarana seed germination.Three factors with two levels each were employed, namely seed aril(removed or non-removed),seed size(big or small),and acid(treated or non-treated).The results showed that guarana seeds took two and a half months to germinate,and the germination lasted for three and a half months.The highest germination rate was found in the big seed,seed arils removed,and acid treated group,which was 100%.The lowest germination rate was observed in the small seed,seed arils non-removed,and non acid treated group,which was 0%.It can be concluded that removing seed aril significantly increases germination rate of guarana;big seeds have higher germination rate;acid treatment significantly increases germination rate.
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