Development of in vitro_technologies for virus free plant materials through meristem or bud culture for sweet potato (Ipomoea batatas) - Abdul Kadir, Mihdzar; Saad, Mohd Said; Sulaiman, Inon; Md. Yusof, Md. Rozadi; Rehah, Julaina Munang Saripah; Konolon, Ritah